Project

FIRENWOOD- Improved fire design of engineered wood systems in buildings

Goal: FIRENWOOD will fill knowledge gaps regarding fire safe use of engineered wood systems, with focus on structural joints and adhesives in cross-laminated timber (CLT), glued-laminated timber (GLT) and wood-based I-joists, and develop validated and relevant fire design models for these systems as well as classification methods for adhesives. A key point is to investigate the behaviour of adhesives used in structural applications, as many of these innovative systems utilise different adhesives.

FIRENWOOD is funded by the ForestValue Research Programme and is coordinated by RISE Fire Research in Trondheim, Norway.
https://risefr.com/services/research-and-assessments/firenwood

#FIRENWOOD #ForestValue

Date: 1 March 2019

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Project log

Tian Li
added an update
FIRENWOOD has just finished a busy experimental campaign before the Easter holiday. Various fire tests were conducted at RISE Fire Research in Norway, including medium-scale furnace testing of CLT and GLT specimens, full-scale furnace testing of loaded CLT and I-joist composite floors, and a large compartment test consisting of engineered wood elements with adhesives. The project team is in the process of analyzing data and preparing reports and manuscripts. Stay tuned for more updates!
 
Geir Jensen
  • 1.25
  • FSS AS
Tian, when do you expect publishing reports? Especially, report on adhesives test.
 
Tian Li
  • 30.62
  • RISE Fire Research AS
The end date of the project is October this year. All the related reports will be published before that.
 
Alar Just
added an update
Glulam beams with all the FIRENWOOD adhesives will be tested for charring in Trondheim. Glulam beams are manufactured with carefully selected and checked properties of lamellae. Thickness of lamellae is 30 mm.
All laminations apart from the mid-depth lamination are strength graded to tension strength class T22. The four lowest lamellas of all 11 beams are further carefully selected to have similar densities, ranging from 470-480 kg/m3 at the fire exposed bottom lamination to 430-440 kg/m3 at the 4th lowest lamination.
Tests will be performed on week 14-16. The testing program is an extension to Firenwood, financed by Studiegemeinschaft Holzleimbau e.V; Fachverband der Holzindustrie Österreichs; AkzoNobel Adhesives AB, BASF SE, Dynea AS, Henkel & Cie. AG, Kiilto Oy and the glulam company Holzleimbau Zischka.
More information by Simon Aicher (Simon.Aicher@mpa.uni-stuttgart.de), Maximillian Henning (Maximilian.Henning@mpa.uni-stuttgart.de), Alar Just (alar.just@ri.se), Jane Liise Nurk (jane.nurk@taltech.ee), Robert Olofsson (Robert.olofsson@risefr.no).
 
Patrick Dumler
added an update
Test specimens with single glued-in rods were produced and tested in warm creep tests. A constant mechanical load was applied until the specimen failed while the specimen was heated to 110 °C. The temperature at the adhesive joint was recorded by thermocouples. Prior to this, reference tests were carried out under normal climatic conditions in order to determine the required load level. The following variants were considered:
  • Embedment length of 150 mm and 300 mm
  • Two rod diameters M12 and M20
  • Two adhesive systems
  • Adhesive joint thickness of 1 mm and 3 mm
  • Two load levels
  • Influence of a joint of 2 mm thickness on the failure behaviour
While in the reference tests wood failure was found in almost all cases, in the warm creep tests the adhesive becomes decisive for the failure. The attached pictures show the test set-up and examples of failure modes.
This work is a part of WP 3 "Experimental Validation", and will give input to WP2 "Improved fire design models for engineered wood systems".
Questions? Feel free to contact us! Patrick Dumler, patrick.dumler@tum.de (WP1 leader)
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
At the latest FIRENWOOD project meeting, progress in WP3 “Experimental Validation” was presented for the project group. We would like to share some info also with our followers:
  • Tests at ambient temperatures, small scale testing of finger joints, cross-laminated timber and glulam are now completed.
  • Analysis of test results show a good correlation between the small scale methods in the cone heater and at elevated temperatures.
  • Results from the small scale finger joint method in the cone heater and the loaded fire tests with I-joists with finger jointed flanges showed good correlation.
The project group have also started discussions on options for full scale tests, to decide on which parameters and configurations to test.
Loaded tests with the I-joists and CLT are in more detailed planning phase.
There is also a potential option that compartment tests will be linked to the FIRENWOOD project, in which it would be of interest to compare a compartment made of CLT with a compartment with the I-joists clad with gypsum.
Questions? Feel free to contact us! Magdalena Sterley, magdalena.sterley@ri.se, Alar Just, alar.just@ri.se (WP2 leader), Robert Olofsson, robert.olofsson@risefr.no(WP3 leader)
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
At the latest FIRENWOOD project meeting, progress in WP2 “Improved fire design models for engineered wood systems” was presented for the project group. We would like to share some info also with our followers:
  • Design models for floors and walls with I-joists is proposed in Final Draft of Eurocode 5-1-2. The floor model takes influence of adhesives to the fire behaviour of flanges into account.
  • We have proposed test method for adhesives used in finger joints of the I-joists. The test method is included in the Final Draft of Eurocode 5-1-2.
  • Bondline integrity is a hot topic. Thickness of lamella would be a parameter necessary for design.
  • For CLT the "step model" of charring is included in the Final Draft of Eurocode 5-1-2.
  • Applicability of “step model” for glulam will be discussed after finalizing the test series of charring.
Questions? Feel free to contact us! Alar Just, alar.just@ri.se (WP2 leader)
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
FIRENWOOD was invited by ForestValue to join the Horizon Results Booster (HRB) services (www.horizonresultsbooster.eu) funded by the European Commission. The first stage was Service 1 “Portfolio Dissemination & Exploitation Strategy” Module A “Identifying and creating the portfolio of R&I project results”. The aim of Module A was to strengthen the capacity of project groups and projects in disseminating and exploiting their research results. This service was expected to maximise the dissemination of results and offer a wider and more complete view to potential users. In addition to FIRENWOOD, 15 other Forsestvalue funded research projects participated.
We recently got confirmation that ForestValue’s application for the second stage has been accepted! This will be Module B and this module focuses on helping the project group to design a common dissemination plan for the portfolio and to carry out the actual dissemination of the portfolio results. The Module will start in October 2021 (Q4;Oct-Dec). 11 other Forestvalue funded research projects will participated in this Module as well, including FIRENWOOD.
This work is a part of WP 4 “Dissemination, communication, exploitation and transnational collaboration”. Contact: Simon Aicher, Simon.Aicher@mpa.uni-stuttgart.de(WP4 leader).
More info on the Booster: www.horizonresultsbooster.eu
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
Due to the covid19 situation, the duration of the FIRENWOOD project has been extended. The new end date is moved from end of March 2022 to end of June 2022.
Questions? Feel free to contact us! Tian Li, tian.li@risefr.no (Project Coordinator)
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
FIRENWOOD is well represented in several conferences and forums of German language, by WP4 leader Simon Aicher (University of Stuttgart):
---
Conference: 26. Internationales holzbau-forum IHF 2021
Date: 1-3 December 2021
Place: Innsbruck (A)
There will be a thematic block on wood and fire at the conference.
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Conference: 6. Internationale Tagung Bauphysik & Gebäudetechnik (BGT)
Date: 25-26th January 2022 (new date; this conference was postponed 2 times)
Place: Garmisch-Partenkirchen (DE)
Title: Brandverhalten geklebter Holzprodukte und –Konstruktionen
Language: German
---
We also attended the 4th Kooperationsforum „kleben von holz und holzwerkstoffen“ on 28-29th April 2021, and gave the presentation "Anforderungen an Klebstoffe aus Sicht einer Prüfstelle". As part of the presentation, fire safety and results from the FIRENWOOD project were presented.
---
For more information, please visit the conference websites, or contact us:
WP4 leader Simon Aicher, Simon.Aicher@mpa.uni-stuttgart.de
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
Together with the German and Austrian associations for glulam, we will be able to add to the planned testing program in FIRENWOOD, and perform additional fire testing of 8 beams.
Combined with the already planned tests in FIRENWOOD, the testing program will now cover up to all 11 adhesives both on the small and model scale.
The tests will together give a very good overall picture of what happens with the glulam on different scales.
This knowledge will be valuable input to Eurocode 5, to provide info for possible application of step model for the charring scenarios for glulam.
This work will add to the work in FIRENWOOD WP2 "Improved fire design models for engineered wood systems" and WP 3 "Experimental Validation".
Questions?
Feel free to contact us! WP2 leader, Alar Just, alar.just@ri.se or Simon Aicher, Simon.Aicher@mpa.uni-stuttgart.de
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
The final draft of Eurocode 5, part 1-2 has been submitted at the beginning of May 2021!
FIRENWOOD project members participate in CEN TC250 SC5. Below is an update from the work this spring carried out by the group.
There is work ongoing in many different working groups, and there is also extensive work on synchronization of different parts of the Eurocode system. Below is an update from this spring, on topics we have found particularly relevant for FIRENWOOD:
The fire-related part of the Eurocode is handled by Working Group 4.
Now that the draft has been submitted, the next steps are to perform editorial and technical reviews. After this, the WG will have an opportunity to make further revisions before the final submission.
A part of the Eurocode which is particularly relevant for FIRENWOOD is Eurocode 5-1-2 Annex B: “Assessment of the bond line integrity in fire (normative)”. Also here, FIRENWOOD results will be relevant, particularly for glue line integrity of finger joints. Here, a method will be proposed and possible changes/ updates will be made.
Annex I of the Eurocode 5-1-2 is based on testing and development done partially within FIRENWOOD.
A hot topic currently under discussion is the charring of glulam members. The application of step-model for charring of glulam will be investigated by additional systematic fire testing within FIRENWOOD.
The date of final publication of the Eurocode 5-1-2 is set to 2027 at the latest.
Questions? Feel free to contact us! Alar Just, alar.just@ri.se (WP2 leader), Katrin Nele Mäger (katrin.mager@taltech.ee)
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
Save the date!
The ForestValue Conference will be arranged 23-25 February 2022, Skellefteå, Sweden!
The conference will be jointly organised by the Swedish representatives of ForestValue ERA-Net Cofund research projects.
FIRENWOOD is one of the organizers.
Welcome!
Information on registration will be announced.
 
Ragni Fjellgaard Mikalsen
added an update
CLT specimens were prepared with the bond area of 50 x 50 mm. Thermocouples were used for measuring temperature in the vicinity of the bond. The thickness of the exposed lamella was 20 mm and time under cone heater with heat flux of 50 kW/m2 was 29 minutes.
CLT specimens have been tested in cone heater until the charring reached the adhesive bond line and temperature within the bond was approximately 300 degC. Directly afterwards specimens were tested in shear to determine the residual shear strength in the bond during charring or when charring of the bond starts.
11 adhesives have been tested with at least 3 replicates and residual failure loads varied from 0 N to 250 N. Great variability between adhesives is present and alsofailure mode differs between different systems; from failure in the bond line to failure in the charred layer with adhesive bond intact. The attached pictures show the test set-up and examples of failure modes.
This work is a part of WP 3 "Experimental Validation", and will give input to WP2 "Improved fire design models for engineered wood systems".
Questions? Feel free to contact us! Magdalena Sterley, magdalena.sterley@ri.se, Alar Just, alar.just@ri.se (WP2 leader), Robert Olofsson, robert.olofsson@risefr.no (WP3 leader)
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
Master student Jane Liise Nurk (TalTech) is performing a study with finger jointed specimens that will give additional information for the FIRENWOOD project.
Cone heater tests with small specimens loaded in tension are performed with specimens made with 11 adhesives. Test specimens have dimensions 10 x 45 x 300 mm. Tests are made without gypsum boards on the fire exposed side. Loading of 1 kN or 2 kN is used. Additionally the specimens without finger joint are tested. Attached are photos of the test set-up.
The master student will compare the test results with the existing results from FIRENWOOD.
The deadline for the master thesis is May 25th 2021.
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
Block shear tests were performed at elevated temperatures up to almost charring limit following the method given in EN 17224. The tests enable a direct comparison of the temperature dependent degradation of bond lines and solid wood. The tests were performed at temperatures of 20 °C (reference test specimen), 180 °C, 200 °C, 220 °C, 232 °C, 250 °C and 270 °C.
The tests revealed a significant different temperature behaviour/resistance of the different adhesive families, especially in the high temperature range of 220 °C to 270 °C.
This work is a part of WP 3 "Experimental Validation", and will give input to WP2 "Improved fire design models for engineered wood systems".
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
Today, FIRENWOOD welcomes our new project coordinator, Dr. Tian Li, who is a senior research scientist at RISE Fire Research and associate professor at the Norwegian University of Science and Technology NTNU, Norway.
We would also like to thank Karolina Storesund for the fantastic job as project coordinator till now.
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
Today, FIRENWOOD is joining a Horizon Results Booster seminar, hosted by ForestValue.
The aim is to maximize the visibility of the results from the ForestValue projects. Around 15 other ForestValue projects will also be joining the seminar. We are looking forward to presenting FIRENWOOD in this forum, and to hear news from the other projects in ForestValue.
This work is a part of WP 4 “Dissemination, communication, exploitation and transnational collaboration”.
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
At the FIRENWOOD project meeting this week, we discussed the plans for the upcoming model scale tests.
Here, a minimum of 2 glulam specimens and 2 CLT specimens will be tested in a horizontal model-scale furnace (1.5 m x 1.5 m). The glulam specimens will most likely be loaded. Discussions are now ongoing on specimens, dimensions of lamellas, type of adhesive etc. In the tests, temperature measurements and visual observations will be performed to follow the behaviour of wood adhesive bonds (possible fall-off of charring layer). The mass loss of the specimens will also be measured to evaluate the adhesive performance. After the tests, the residual cross-sections will be measured and examined.
We are now also discussing with potential collaboration partners to expand the test series, to allow for a more extensive test program.
This work is part of WP 3 "Experimental Validation", and will give input to WP2 "Improved fire design models for engineered wood systems".
Questions? Feel free to contact us! WP2 leader, Alar Just, alar.just@ri.se WP3 leader, Robert Olofsson, robert.olofsson@risefr.no
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
At the recent TC193 meeting, it was discussed to arrange a joint workshop, hosted by TC193 and FIRENWOOD, during spring of 2021. Here, the adhesive industry, and other research projects such as the GLIF project would be invited. This should also facilitate a key aspect and outcome of FIRENWOOD, that the results are also correlated with the results from other ongoing research, such as GLIF.
We will keep you updated on the plans here.
Do you have ideas, interest for, or comments for such an event?
Please don’t hesitate to contact us, or the TC193 management group.
WP2 leader: Alar Just, alar.just@ri.se
WP4 leader: Simon Aicher, Simon.Aicher@mpa.uni-stuttgart.de
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
At the ForestValue Research Programme Midterm Seminar this week, we presented this presentation (see pdf for download attached) on the current status in the FIRENWOOD project.
There are in total 17 trans-national projects in this ForestValue programme. You may find our presentation and also presentations from the other projects here: https://forestvalue.org/annual-seminar-17-nov-2020/
#ForestValue #FIRENWOOD
 
Ragni Fjellgaard Mikalsen
added an update
This week, the FIRENWOOD project is joining a ForestValue mid-term seminar. We will present project progress and get information on other projects in ForestValue. FIRENWOOD is represented by project manager, Karolina Storesund. The slides and a recording from the seminar will be made public here: https://forestvalue.org/annual-seminar-17-nov-2020/
We are also joining the TC193 meeting this week. FIRENWOOD is represented by Patrick Dumler, Magdalena Sterley, Maximillian Henning, Simon Aicher and Alar Just.
#ForestValue #FIRENWOOD
 
Ragni Fjellgaard Mikalsen
added an update
The paper «Influence of adhesives on fire resistance of wooden I-joists” will be presented by Mäger et.al. at the World Conference on Timber Engineering 2020, which is now postponed due to corona till mid-2021. We will now share some information from this work, but for copyright reasons we are not able to share the full paper.
Abstract: As one part of the FIRENWOOD project, various adhesives, allowed for load bearing timber structures, are tested in finger joints in small scale and medium scale fire tests. The paper will provide a description of these tests and an overview and analysis of the results. Based on the test data of both types, a good agreement regarding the adhesive performance between the tests can be shown. The design model for wooden I-joists is described and values for the depth of the zero-strength layer are proposed for different adhesive performance levels in finger joints.
Design model for floors with I-joists: The paper proposes differences on zero-strength layer (ZSL) in tension flange according to adhesive behaviour in the finger joints. The additional ZSL values are based on analysis of loaded fire tests.
Experiments: Test set-up and results from small scale and medium scale tests are presented in the paper. The timber material was spruce, obtained from one producer and classified to T22 according to EN 14081. Different adhesive systems (11 in total) were included in the project. In small scale, the tested finger jointed specimens had dimensions 10x45x300 mm. Time to failure, residual cross-section height and the failure mode was registered. In medium scale, I-joists with 200 mm cross-section height were tested.
The summary from the paper states that there is an influence of adhesives in finger joints to the load-bearing capacity of I-joists in fire. This is considered by different zero-strength layers proposed for the fire design model of I-joists. Small scale method with tension tests of small finger jointed specimens under cone heater with static loading can be used as an indication of adhesive behaviour of finger joints in fire. The correlation between small scale tests and medium scale tests could be observed. However, the ongoing investigations with test methods at elevated temperatures and full scale furnace tests need to be performed until the final conclusions are drawn.
The full conference paper will be available as part of the conference proceedings, once the conference has been held: K. N. Mäger, A. Just, M. Sterley, and R. Olofsson, “Influence of adhesives on fire resistance of wooden I-joists,” presented at the World conference on timber engineering, Santiago, Chile, Aug. 2020.
For more information, please contact the authors:
Katrin Nele Mäger: Katrin.Mager@taltech.ee
Alar Just (WP2 leader): Alar.Just@taltech.ee
Magdalena Sterley: Magdalena.Sterley@ri.se Robert Olofsson (WP3 leader): Robert.Olofsson@risefr.no
#FIRENWOOD #ForestValue
 
Patrick Dumler
added an update
The first test specimens of test series 1 on glued-in rods were tested under standard temperature conditions. In the following tests, the temperature load will be increased. This work is a part of WP 3 "Experimental Validation", and will give input to WP2 "Improved fire design models for engineered wood systems". Questions? Please feel free to comment below or contact us on email: Author: Patrick Dumler patrick.dumler@tum.de WP1 leader: Normal Werther, n.werther@tum.de #FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
The FIRENWOOD project group is currently working on a stakeholder article, led by Dr. Simon Aicher, with the aim to address and reduce the technical and societal reasons as well as misunderstandings which contribute to barriers related to the use of innovative wood systems. In the FIRENWOOD project, the gathering of knowledge about technical, societal and political obstacles in different countries is based on two pillars, being (i) extensive experimental and theoretical research on small, medium and large sized specimens subjected to high temperatures up to charring as well as fire exposure in work packages (WPs) 2 and 3 and (ii) a deepened communication with building and fire safety authorities, standardization organizations/working groups, designers, end-users and practitioners. Based on the gathered data, new coherent strategies for fire design and optimization of engineered bonded wood systems and wood structures related to fire behaviour will be developed. The enhanced knowledge level should present the potential for updating regulations and adoption of pre-accepted solutions.
The stakeholder article will be finished for submission shortly, and we are aiming to submit the work to a scientific journal within the structures and polymer science field.
This work is a part of WP 4 “Dissemination, communication, exploitation and transnational collaboration”.
Questions? Please feel free to comment below or contact us on email:
#FIRENWOOD #ForestValue
 
Patrick Dumler
added an update
The first test specimens of test series 1 on glued-in rods were produced in the test hall of the TUM in Munich. In the following tests, test specimens are subjected to tensile loading at selected temperatures using various adhesives. In addition to the adhesive type and the behaviour of the adhesive under elevated temperature, the influence of the adhesive joint thickness is investigated . A further series of tests with the small scale test specimens are hot creep tests. Further experiments with glued-in rods will follow.
This work is a part of WP 3 "Experimental Validation", and will give input to WP2 "Improved fire design models for engineered wood systems".
Questions? Please feel free to comment below or contact us on email: Author: Patrick Dumler patrick.dumler@tum.de
WP1 leader: Normal Werther, n.werther@tum.de
#FIRENWOOD #ForestValue
 
Patrick Dumler
added an update
FIRENWOOD Report D1.1 published!
The FIRENWOOD report “Obstacles and possibilities in implementation and use of engineered wood systems in construction” is now published. In this report we identify barriers and new strategies for the implementation and use of wood-based systems in the building industry. Different barriers and perceptions are presented, including: social, technical and performance related, economic and political barriers. Opportunities for the road ahead are also discussed. You may find the full report in this project site on Research Gate, DOI: 10.13140/RG.2.2.13080.21768 .
This work is Delivery D1.1, as part of WP 1 “Obstacles and new strategies for implementation and use of engineered wood systems in construction”.
Questions? Please feel free to comment below or contact us on email: Author: Patrick Dumler patrick.dumler@tum.de
WP1 leader: Normal Werther, n.werther@tum.de
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added a research item
The aim of this report is to identify barriers and new strategies for the implementation and use of wood-based systems in the building industry. A complete list of parameters that have a negative impact on a widespread application for timber construction is potentially infinite and depends on the people, regions and views involved. Many of the obstacles identified can be attributed to a lack of knowledge about wood as a building material. For this reason, information campaigns and better further training opportunities must be created. Another possibility is the development and provision of standard solutions as well as component catalogues and experience reports of already completed projects. Missing limit values and gaps in standardization lead to uncertainty and non-application. For this reason, further research work is necessary to close any gaps in knowledge and to increase safety in timber construction. A higher CO2 price within the EU emissions trading system can help timber construction to gain a higher market share due to its function as a CO2 storage. Therefore, greater consideration of environmental aspects in building construction is necessary. | The report is a part of the research project FIRENWOOD - Improved fire design of engineered wood systems in buildings.
Katrin Nele Mäger
added an update
Our abstract titled "Fire Design of I-joists in Wall Assemblies" by Katrin Nele Mäger and Alar Just has been accepted for submission to the 2020 INTER meeting.
This activity is an important accomplishment for the ongoing PhD work of Mäger, and also a great opportunity to showcase research results from FIRENWOOD.
Our proposed content for this year's meeting is about the fire design model for wood-based I-joists in wall assemblies. The development of the I-joist model is one of the aims of the FIRENWOOD project. In our paper, the methods, results and analysis of I-shaped compression members exposed to fire will be described. The preparation of the paper is ongoing.
INTER - International Network on Timber Engineering Research - is a group of active scientists, engineers and standardisation professionals who have been meeting yearly since 1973. 
Formerly the group organised as CIB-W18 "Timber structures" and since 2014 the INTER name was adopted.
The INTER meetings are strongly geared towards introducing new research results into standards.
The meetings have an interesting format different from typical conferences. The papers are chosen based on short 2-page abstracts and presented at the meeting in a 20-minute oral presentation. All papers are prepared before the meeting and made available to participants beforehand. 
During the meeting, a live review is conducted where all participants may ask questions and comment on the paper for an unlimited time. 
Presenting research results at the INTER meeting sometimes can be like taking a really hard exam!
For more information about previous and future meetings and proceedings, please visit the INTER website: https://holz.vaka.kit.edu/386.php
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
The partners in FIRENWOOD got a presentation last week of the first results from the first loaded fire tests of finger jointed I-joists, by Alar Just and Robert Olofsson. Here is some technical information from the tests, and a few glimpses of the results (which will be published in full on a later stage).
Temperature information was collected using 18 thermocouples per beam, here we show data from some of these thermocouples, which were connected to the I-joists. In this example, rupture was observed at 26 minutes. From the temperature measurements, we may assume the start of charring of the wood (at 300 deg C) and temperature rise in different locations on the assembly.
The rupture mode is one of several topics that will be analyzed more in-depth going forward. These first medium scale experimental results are important first steps in the FIRENWOOD project!
This work is part of WP 3 "Experimental Validation", and will give input to WP2 "Improved fire design models for engineered wood systems".
Questions? Feel free to contact us! WP2 leader, Alar Just, alar.just@ri.se WP3 leader, Robert Olofsson, robert.olofsson@risefr.no
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
The first medium scale tests in the FIRENWOOD are now being conducted at RISE Fire Research in Trondheim, here are some pictures from the tests. The purpose of the tests is to document the performance of the adhesives in the finger joints in the I-joists during heat exposure. In this test series, all 11 adhesives used in the FIRENWOOD project will be studied.
The test specimens consist of I-joists with multiple finger joints in tension (L = 5000 mm, H200). The specimens are mounted on top of a medium scale fire resistance furnace (1.5 x 1.5 x 1.5 meters), and exposed to fire from below.
I-joists are loaded with the constant bending moment respective to 40% of bending strength at ambient conditions. Direct fire exposure of the I-joists is protected by gypsum cladding.
This work is a part of WP 3 "Experimental Validation", and will give input to WP2 "Improved fire design models for engineered wood systems".
Questions? Feel free to contact the WP3 leader, Robert Olofsson, robert.olofsson@risefr.no
#FIRENWOOD #ForestValue
 
Michael Klippel
added an update
One goal in FIRENWOOD is knowledge exchange with other relevant projects. Today, the project group got an update from the GLIF ( Glue Line Integrity in Fire) project, by Michael Klippel from ETH Zurich, who is a research partner in both FIRENWOOD and the GLIF project.
Collaboration within those two projects is very important!
The objective of GLIF (Glue Line Integrity in Fire) is the development of a standard fire testing methodology and a classification method of the glue line integrity of CLT and comparable engineered mass timber materials.
The classification would distinguish glue lines that (i) do or (ii) do not exhibit fall-off of charred or charring layers or lamellae in fire conditions, also referred to as loss of stickability in EN 13381.
This is essential to allow:
a) the structural designer to choose the appropriate calculation model and
b) the fire engineer to estimate the interaction of the construction element with a fire compartment.
In the GLIF project, benchmark tests will be performed with solid timber panels (no CLT!) to determine the mass loss rate of solid timber. This will be done at different furnaces (oil and gas fired) and with different specimen sizes [model scale (1x1 meters) and full scale (5x3 meters)].
The GLIF project is funded by a European project and reference group with partners from different associations, adhesive manufacturers and timber companies.
 
Ragni Fjellgaard Mikalsen
added an update
FIRENWOOD manufactured finger joints which will be tested in the project, at Masonite Beams in Rundvik in northern Sweden, on January 23th and 24th 2020.
Three different specimen types were made; finger joints for small scale fire testing, finger joints for small scale heat testing and finger joints for flanges for I-beams which will be tested in model scale furnace. The small scale specimens were glued in the lab in the factory, while flanges were glued in Masonite’s production line.
There are 11 adhesives which will be used in the project, 7 of which were used in this round, the remaining 4 will be used in the next round of gluing in March.
Several partners from the FIRENWOOD project joined: Alfred Wikner from Masonite Beams, Magdalena Sterley from RISE Research Institutes of Sweden, Maximillian Henning from University of Stuttgart, Katrin Nele Mäger from Tallinn University of Technology.
This work is a part of WP 3 "Experimental Validation", and will give input to WP2 "Improved fire design models for engineered wood systems".
Feel free to contact us! WP2 leader: alar.just@ri.se
#FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added an update
We are working on updating the overview of the limitations to the use of wood systems and the required fire resistance of building components depending on the height of the building, based on information gathered in the Cost Action FP1404 .
Please help with this work by entering the data for your country:
If necessary, feel free to expand the tables.
If you have questions, please contact: patrick.dumler@tum.de
Many thanks for your support and please help to spread the word!
#FIRENWOOD #ForestValue
 
Alar Just
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There are several tests in different scale planned. Test specimens will be glued with 11 adhesives using timber with similar and known properties. Tests will be performed under cone heater, in model and full scale furnaces and at chambers with elevated temperatures. Attached table consists information about raw material and raw specimens as well as final test specimens.
 
Ragni Fjellgaard Mikalsen
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First rounds of testing in the cone calorimeter for the #FIRENWOOD project! Magdalena Sterley from RISE Bioeconomy&Health is visiting RISE Fire Research in Trondheim for a few days. Magdalena and Morten Daffinrud are testing apparatus and equipment and making pretests this week. The verification of methods will be used for small scale fire testing of finger joints and CLT structures. #FIRENWOOD #ForestValue
 
Ragni Fjellgaard Mikalsen
added a research item
The main goal in FIRENWOOD is to ensure fire safe use of innovative, engineered wood systems in taller and larger buildings, by providing • Improved fire design models, validated by small-and full-scale fire tests. • Classification and test methods for adhesives with regard to elevated temperatures and fire. The main focus will be the effect of structural joints and adhesives in cross-laminated timber (CLT), glue-laminated timber (GLT) and I-joists. Objectives: Develop and implement game-changing strategies to reduce obstacles for innovation, design and use. 1. Develop small-scale test method for classification of temperature and fire behaviour of wood adhesives for bonds in finger joints as well as for CLT and GLT face bond applications. The classification of adhesives will also be included in the design methods developed as part of the project. 2. Determine the relation between the behaviour of engineered wood systems and their components in elevated temperatures and real fire conditions. 3. Provide improved, validated models for standard fire design of: • wooden I-joists, • CLT and GLT • glued structural connections (glued-in rods, glued-in connectors) 5. Provide technical knowledge base that can be used by authorities and industries in future design standards. 6. Contribute to transnational collaboration in the field of fire safety of innovative engineered wood systems. FIRENWOOD is supported under the umbrella of ERA-NET Cofund ForestValue by Germany (Federal Ministry of Food and Agriculture (BMEL); Agency for Renewable Resources (FNR)), Sweden (Federal Ministry of Food and Agriculture (BMEL); Agency for Renewable Resources (FNR)) and Norway (Research Council of Norway (RCN)). Fo-restValue has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement N° 773324. The project is coordinated by RISE Fire Research in Trondheim, Norway. Website: https://risefr.com/services/research-and-assessments/ firenwood Project publications on Research Gate: https://www.researchgate.net/project/FIRENWOOD-Improved-fire-design-of-engineered-wood-systems-in-buildings Contact: Karolina Storesund RISE Fire Research, Norway Karolina.storesund@risefr.no
Ragni Fjellgaard Mikalsen
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Watch our 4 min pitch with key information on the FIRENWOOD project:
Here you may also find the powerpoint presentation:
 
Ragni Fjellgaard Mikalsen
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Here is the official logo of the FIRENWOOD project! The colors used are inspired by the forest, and the colors of the tree reflect both leaves and flames.
 
Ragni Fjellgaard Mikalsen
added an update
The project group were gathered for the first time in a project kick-off in Trondheim, 12.april 2019. Here is a picture from the official kick-off of the FIRENWOOD project!
 
Ragni Fjellgaard Mikalsen
added a project goal
FIRENWOOD will fill knowledge gaps regarding fire safe use of engineered wood systems, with focus on structural joints and adhesives in cross-laminated timber (CLT), glued-laminated timber (GLT) and wood-based I-joists, and develop validated and relevant fire design models for these systems as well as classification methods for adhesives. A key point is to investigate the behaviour of adhesives used in structural applications, as many of these innovative systems utilise different adhesives.
FIRENWOOD is funded by the ForestValue Research Programme and is coordinated by RISE Fire Research in Trondheim, Norway.
#FIRENWOOD #ForestValue