Bruno Pedrosa

Bruno Pedrosa
University of Coimbra | UC · Institute for Sustainability and Innovation in Structural Engineering

PhD student

About

27
Publications
12,095
Reads
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138
Citations

Publications

Publications (27)
Article
Injections bolts were initially conceptualized to repair riveted connections in bridges with long service lifetime and now they are widely used in steel and composite structures. Injecting steel-reinforced epoxy resin in bolted connections with oversized holes is a novel approach to enable fast and easy assembly of composite structures while limiti...
Chapter
There is a significant number of old metallic bridges with high levels of structural degradation due to their long service period. Fatigue problems are especially important in these structures since the majority of them were not designed taking into account this phenomenon. Several investigations showed that riveted joints are critical details sinc...
Article
Old metallic bridges are prone to high levels of structural degradation due to their long service life, therefore, it is essential to study strengthening techniques. Implementation of injection bolts to replace riveted joints exposed to fatigue damages has been studied. The mechanical performance of injection bolts has been studied mainly based on...
Article
All over the world, the number of civil engineering structures, particularly bridges with long service periods, has been increasing. The most common evidences of damages are the presence of corroded metallic elements and cracks in structural details due to the fatigue phenomenon. A large number of cases were found in which fatigue cracks were detec...
Article
Full-text available
The paper deals with the subject of diagnostics and the quick repairs of long-term operated metallic materials. Special attention was paid to historical materials, where the structure (e.g., puddle iron) is different from modern structural steels. In such materials, the processes of microstructural degradation occur as a result of several decades o...
Article
In North America and Europe, there is a significant number of centenary metallic bridges that require maintenance and strengthening operations. These structures need to be adapted to increasing traffic intensities, and their structural integrity should be constantly evaluated. Fatigue damages were not considered in the original design of old metall...
Article
It is of high importance to develop innovative strengthening and rehabilitation operations for bridges whose design life is coming to an end. A case study concerning the centenary Portela road bridge in Coimbra is addressed. In situ experiments were performed in order to obtain a modal identification of the structure. The data was used to elaborate...
Article
Traffic patterns increasing and the degradation of existing roadway steel bridges due to poor maintenance has led to the need of an assessment deciding whether to retrofit or to supply a structure replacement. This paper focusses on the rehabilitation of steel truss bridges in order to extend the lifetime of such bridges. Two case studies are prese...
Article
Injection bolts have been used to replace faulty rivets on strengthening operations of old riveted steel bridges. This technology has been essentially tested for its quasi-static or creep behaviour and there are very few studies concerned the assessment of its fatigue resistance. This paper presents an experimental program developed to evaluate the...
Article
This article presents experimental results of steel truss nodes strengthened/refurbished with concrete encasement. Four strengthened specimens are tested in total, two encased in normal class concrete and two encased in high strength concrete C80/95. The results obtained are compared with one reference bare steel node test. All specimens are loaded...
Article
Fatigue failures are a concern for old riveted steel bridges since most of them were not originally designed taking into account fatigue. The usual fatigue assessment approach for riveted joints consists of using the fatigue class 71 S-N curve proposed in Eurocode 3, part 1-9. However, this approach may lead to excessive conservative predictions si...
Conference Paper
Full-text available
The problem considered in this paper is the structural integrity of old materials from the 19th century by means of fatigue crack growth problem. The authors present an overview of the fatigue fracture properties of old puddle iron members extracted from long-term operated bridges located in France. The fracture properties and fatigue crack growth...
Article
The maintenance and safety of ancient bridges is a major concern of governmental authorities. In particular, the safety of old riveted bridges fabricated and placed into service at the end of the 19th century deserves particular attention. These structures are susceptible to exhibit high fatigue damage levels due to their long operational period wi...
Article
Full-text available
In the old steel truss bridges one particular point of interest are the nodes. While for strengthening/refurbishment of the elements of the truss engineers can rely on more conventional methods, usually, for the nodes unique solutions have to be adopted. One integral solution, which could be implemented in a variety of steel truss nodes, is strengt...
Conference Paper
Maintenance and safety assurance of old riveted bridges designed in the period which steel has become an economically viable material for bridge construction, i.e., between the end of the 19th and the beginning of the 20th century, deserve special attention. These structures are prone to present high levels of structural degradation due to their lo...
Article
Different strategies can be used to perform reparations and reinforcements of ancient bolted and riveted metallic bridges. As the riveting process is not currently a common practice, it requires proper equipment and skilled workers. Another solution is the use of welding. However, the weldability of old steels is poor. Bolts are very attractive alt...
Article
Full-text available
The behaviour of standard bolted steel connections submitted to monotonic loads, through the use of numerical models, is presented in the current paper. The bolted connections allow speed up constructive processes in an increasingly competitive and globalized world in which the costs are a decisive factor in the development of a project. The use of...
Conference Paper
Full-text available
Among the strategies that can be implemented for repairing and strengthening operations of old metallic structures, using structural adhesives to improve the fatigue strength of steel connections has been considered as a good solution. It is expected that the adhesive help to distribute and to transfer the load over a large area, thus reducing stre...
Conference Paper
Full-text available
A considerable number of numerical simulations have been implemented aiming to understand the behaviour of riveted and bolted connections under static and fatigue loading conditions and stablish a comparison. Different methodologies can be used concerning the definition of the finite element, the contact algorithm and the clamping stresses. Regardi...
Conference Paper
Full-text available
This paper focuses on the fatigue characterization of Sikadur®-30 and Sikadur®-52, adhesives/resins used to fill the gap between the bolt and plates of metallic connections. The fatigue tests of the resins under study were performed according to ASTM D7791-12 standard. This standard allowed to obtain the cyclic elastoplastic fatigue behaviour of th...
Article
Full-text available
Inspections of ancient metallic bridges have illustrated fatigue cracking in riveted connections. This paper presents a comparison between two alternative finite element (FE) models proposed to predict the fatigue strength of a single shear and single rivet connection. The first model is based on solid finite elements as well as on contact elements...
Article
Full-text available
In Portugal there is a number of old metallic riveted railway and highway bridges that were erected by the end of the 19 th century and beginning of the 20 th century, and are still in operation, requiring inspections and remediation measures to overcome fatigue damage. Residual fatigue life predictions should be based on actual fatigue data from b...
Conference Paper
Full-text available
Among the different strategies that can be implemented in the repairing and strengthening operations of old riveted steel bridges, resin-injected bolts have been used to replace faulty rivets and preserve the slip resistance of the joint. This technology is preferred since it only requires a standard preparation of the holes and its structural perf...
Conference Paper
Full-text available
This paper has as main theme the characterization of the monotonic and fatigue behaviour of structural adhesives/resins used in repairing and maintaining of old metallic bridges. This study aims essentially at the mechanical characterization of structural adhesives/resins, such as, Sikadur®-30 and Sikadur®-52, used to fill the gap between the bolt...
Conference Paper
Full-text available
Different strategies can be implemented in the repairing and strengthening operations of old riveted steel bridges. Riveting is no longer common practice, consequently finding good equipment and skilled riveters is difficult. The use of welding may not be considered due to the poor weldability properties of the old steel. Regarding high strength fr...

Questions

Question (1)
Question
I am computing stress intensity factor for CT specimen and trying to model a crack using Contour Integral Method.
"
a.engineeringFeatures.ContourIntegral(name='Crack_1', symmetric=OFF,
crackFront=crackFront, crackTip=crackTip,
extensionDirectionMethod=Q_VECTORS, qVectors=(((0.0, 0.0, 0.0), (-1.0, 0.0, 0.0)), ), midNodePosition=0.25, collapsedElementAtTip=SINGLE_NODE)
"
When I run the scrip it replies: "NameError: name 'Q_VECTORS' is not defined
What should I do?
Thank you.

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Projects

Projects (6)
Project
In this project there is proposed a new manufacturing technology for composite reinforcing bars and anchor plates. They will be characterized by a new structure, composed of minimum two layers that are a result of introducing unconventional, innovative technological solution based on pultrusion and winding methods. In order to achieve that, there will be used special active form for bars. New group of reinforcing bars (rebars) and anchor plates will be characterized by number of advantages, for example: over 3 times mass reduction, high specific strength (dependently on used fiber; for carbon fiber even 10 times higher than steel equivalent bars), lack of uncontrolled deformation during mounting, lack of products of corrosion removal before reinforcing the concrete, better resistance to chemically aggressive substances, lack of threat of limiting the influence of the Earth magnetic field (no Faraday’s cage creation in the buildings), electro-isolation. Composite anchor plate will be elastic enough to replace ground “string” anchors commonly used in civil enigineering. There will be developed nut an washer mounting system for each spot on the anchor plates. R&D program covers complex experimental research (physio-chemical investigations) as well as mechanical tests under static, dynamic and cyclic loading in various corrosive environments and temperatures. That will allow the experiment to reflect the actual extreme conditions on the structural members. Moreover, there will be proposed a smart system of monitoring the composite carrying structures according to modern construction monitoring strategy SHM (Structural Health Monitoring). During the project there are predicted experimental and numerical research in order to optimize strength of manufactured components. During the last stage there will be conducted an investigation on prefabricated concrete members reinforced with proposed newly-manufactured composite bars.
Project
Publisher: InderScience Journal: International Journal Of Ocean Systems Management ISSN online: 1752-6590 ISSN print: 1752-6582 4 issues per year Scope IJOSM covers the aspects of technology development, materials processing, equipment, planning, design, analysis, construction, operation, maintenance and management of ocean structural systems, ocean transportation, submarines and robotics systems, marine resource development, ocean energy, environmental management, public policy and ocean use, ports, and fisheries. It particularly encourages work that successfully integrates theory, methodology, and experience in the fundamental disciplines that constitute the ocean structural systems area, such as engineering, meteorology, applied mathematics, economics, business administration, operations research, environmental and legal aspects. Topics covered include - Ocean systems/project management - Fixed and floating marine structural systems - Structural materials processing - Breakwaters and mooring systems - Submarines and robotics systems - Ocean transportation, short sea shipping, passenger ferry management - Marine resource development - Ocean Energy - Environmental management, regulations/policy for the ocean environment - Public policy and ocean use - Maritime economics and business, ocean systems economics - Technological innovation in shipping/ports, satellite applications - Intermodal systems - Knowledge-based policies/education, knowledge transfer in shipping firms - Fisheries Editors-in-Chief José A.F.O. Correia, University of Porto, Portugal, ijosm.editor@gmail.com Associate Editors-in-Chief Nicholas Fantuzzi, University of Bologna, Italy Shun-Peng Zhu, University of Electronic Science and Technology, China Soteris Kalogirou, Cyprus University of Technology, Cyprus Teresa Magoga, University of Tasmania, Australia Jeom Kee Paik, University College London, UK Assistant Editor Bruno Pedrosa, University of Coimbra, Portugal Editorial Board Members Abílio De Jesus, INEGI, Portugal Behrooz Keshtegar, University of Zabol, Iran Dimitrios Pavlou, University of Stavanger, Norway Grzegorz Lesiuk, Wroclaw University of Science and Technology, Poland Hermes Carvalho, Federal University Minas Gerais, Brazil Srinivasan Chandrasekaran, Indian Institute of Technology Madras, India Tiago Ferradosa, University of Porto, Portugal Valeria Casson Moreno, University of Bologna, Italy Dariusz Rozumek, Opole University of Technology, Poland Yuming Liu, Massachusetts Institute of Technology, USA María Nogal, Delft University of Technology, Netherlands Mohamed Seghier, Ton Duc Thang University, Vietnam Jinhai Zheng, Hohai University, China Kostas Belibassakis, National Technical University of Athens, Greece Filippo Berto, Norwegian University of Science and Technology, Norway
Project
Dear Colleagues, I invite you to submit an abstract to the Symposium Risk analysis and Safety of Technical Systems organized by Technical Committee 12 “Risk analysis and Safety of Large Structures and Components (RAS TC 12)” of the European Structural Integrity Society within the framework of the 22nd European Conference on Fracture - ECF22 to be held in Belgrade, Serbia, 26-31 August 2018 (see http://www.ecf22.rs/). The deadline for the abstracts is 31 January 2018. This Symposium is intended to be a forum of discussion of the recent advances in maintenance, safety, risk analysis, management and life-cycle performance of a wide range of infrastructures, such as, engineering technical systems, bridges, buildings, dams, railways, underground constructions, wind and transmission towers, offshore platforms, pipelines, naval vessels, ocean structures, nuclear power plants, airplanes and other types of structures including aerospace and automotive structures are considered. It is expected contributions from engineers, metallurgists, material scientists, among others, allowing a very multidisciplinary discussion. All contributions in the form of extended abstracts will be peer reviewed by the members of ESIS TC12 Technical Committee. A selection of papers presented at this Symposium will be published in a Special Issue on associated ESIS journals (International Journal of Fatigue, Engineering Failure Analysis, Engineering Fracture Mechanics, Theoretical and Applied Fracture Mechanics). The ESIS technical committee “TC12 - Risk Analysis and Safety of Large Structures and Components” supports the Minisymposium. The annual meeting of the TC12 will be performed during the conference event. IMPORTANT: 1) When submitting your abstract please mention the name of Symposium - “Risk analysis and Safety of Technical Systems”. 2) Please inform us about your submission/intention to submit so that we could plan Symposium’s sessions (jacorreia@inegi.up.pt) With best regards, José Correia, Vladimir Moskvichev and Aleksandar Sedmak ESIS TC12 Chairs