Jens Schneider

Jens Schneider
Technical University of Darmstadt | TU · Department of Civil and Environmental Engineering Sciences

Professor

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317
Publications
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2,202
Citations

Publications

Publications (317)
Article
Glass establishes its use as a real structural material in engineering. The first glass-metal domes already benefited, unintensionally, from the stiffening of the glass panes, but only today is glass used as a real structural element by engineers. Examples of free form glass domes, cable net walls, glass beams, glass fins and glass columns demonstr...
Article
Eine Erhöhung der Energieeffizienz in der Industrie wird derzeit in erster Linie auf Ebene der einzelnen Maschinen durch isolierte, parallel laufende Maßnahmen erzielt. Deutlich mehr Potenzial bietet ein ganzheitlicher Ansatz, der Energieeffizienzmaßnahmen in der Produktion über die Gebäudeautomation mit der Gebäudehülle und damit der Umwelt verknü...
Conference Paper
Full-text available
In 2019, the German Federal Railway Authority commissioned the consortium TU Darmstadt, KU Leuven, AIT-Austrian Institute of Technology and REVOTEC to develop a new dynamic load model for high-speed railway bridges. It aims to cover the envelopes of the dynamic train signatures and acceleration responses for all currently operating trains and the c...
Preprint
Full-text available
The present paper is concerned with deriving simplified design equations and charts for modelling in-plane expansion of fractured thermally pre-stressed glass panes using the method of equivalent temperature differences (ETD) together with a thermal expansion analogy for strains. The starting point is a theoretical method based on linear elastic fr...
Article
Full-text available
Requiring both stress and energy conditions to be met simultaneously proved key to modeling brittle crack formation at singular and nonsingular stress concentrations in linear elastic materials. The present work extends this so-called coupled stress and energy criterion to brittle crack nucleation in hyperelastic media using the example of silicone...
Conference Paper
Full-text available
The sustainability of structural systems and the impact of used construction materials on the environment is an ongoing concern in the construction industry. Multi-layer, sheet-based structures can provide more sustainable solutions for construction mass reduction and its adverse effects. In particular, the use of glass as a structural sheet materi...
Article
Full-text available
In most float glass productions, quality control systems will remove glass inclusions with diameters above 500 µm, since smaller inclusions are usually not visible to the human eye. Yet, they can still become relevant in glass construction, one example being nickel sulphide which can cause spontaneous fracture of thermally prestressed glass. This r...
Article
Full-text available
Thermally toughened safety glass must meet safety requirements in the building industry. Here, destructive tests are defined in the product standards, which must be carried out on small, standardized format (360 mm × 1100 mm) glass elements to determine the fracture pattern and bending strength. This is costly and not in the interests of sustainabi...
Article
Full-text available
This research is related to the structural performance of a shell-type system made of hollow glass units (HGU) that utilizes glass as the primary structural material. The efficient structural function of the proposed shell-type system is designed using Polyhedral Graphic Statics to achieve a system geometry that maximizes in-plane compression and l...
Article
Full-text available
The present study investigates in the failure of adhesive bondings with structural silicone sealants. Point connectors of two circular metal adherends bonded with DOWSIL™ TSSA are subjected to tensile loading. We formulate and use a constitutive law that captures volumetric softening owing to the formation of cavities. Therein, cavitation is consid...
Conference Paper
Full-text available
Die neuesten Fortschritte in der Fahrzeugtechnik mit Bezug auf die Radsatzanordnung, Zuggeschwindigkeiten und Radsatzlasten haben dazu geführt, dass das derzeit gültige Norm-Lastmodell für die dynamische Berechnung von Eisenbahnbrücken (HSLM) die tatsächlich verkehrenden Züge nicht mehr vollständig abdeckt. Daher bestand die Notwendigkeit, eine umf...
Article
Im Reallabor DELTA werden energiesystemische Methoden angewendet und energietechnische Anlagen errichtet, um erfolgreiche Pilotprojekte der urbanen Energiewende in die breite Anwendung zu überführen. Im Mittelpunkt steht die konsequente Steigerung der Energieeffizienz in allen Sektoren, die bereits heute als größtes nutzbares Potenzial der urbanen...
Article
In the living lab DELTA, energy system methods are applied, and energy technology systems are installed to transfer successful pilot projects of the urban energy transition to a broad application. The focus is on the consistent improvement of energy efficiency in all sectors, which is already considered to be the largest usable potential of the urb...
Article
Full-text available
This paper presents the first part of a study on the effect of wind loads on Vacuum Insulated Glass (VIG) units. The study provides background information on VIG and relevant Standards, explains the numerical modelling process, and discusses the implications of the results in relation to European and North American codes and Standards. The focus of...
Preprint
Full-text available
The present study investigates in the failure of adhesive bondings with structural silicone sealants. Point connectors of two circular metal adherends bonded with DOWSIL TM TSSA are subjected to tensile loading. We formulate and use a constitutive law that captures volumetric softening owing to the formation of cavities. Therein, cavitation is cons...
Conference Paper
Globally, infrastructure faces the challenge of aging bridges and increasing traffic loads. Extended operational availability and safety of the bridge structures can be enabled by Structural Health Monitoring (SHM) methods. For this, knowledge of the actual vehicle loads is of crucial importance for evaluation of the remaining service life. Direct...
Article
The structural condition of bridges in Germany is often affected by aging and increased traffic loads. However, retrofitting or renewing all bridges is not always feasible due to limited resources. Indirect or drive‐by monitoring of bridges with sensors on passing vehicles has been explored as a cost‐effective and scalable alternative to direct mon...
Article
Railway bridges have a long lifespan, which is challenged by the constant development of vehicles leading to increased loads that they were not originally designed for. To ensure the longest possible use of existing structures, a sensor‐based structural health monitoring system can make a significant contribution. However, due to economic reasons a...
Conference Paper
Infrastructure worldwide is facing the challenge of aging bridges and increasing traffic loads. Prolonged serviceability and safety of these structures can be enabled by Structural Health Monitoring (SHM) methods. Knowledge of the actual operating loads is critical for evaluation of the remaining service life. However, direct measurement of the loa...
Article
Full-text available
This paper presents a methodological approach for the evaluation of the thermal behavior of cementitious porous media with/without integrated latent-heat thermal energy storage (LHTES). To achieve this goal, the Lewis-Nielsen model has been calibrated to predict the insulation properties of mineralized foamed concretes. Two pore-related microstruct...
Article
Full-text available
EN1288-3 (Glass in building—Determination of the bending strength of glass—Part 3: test with specimen supported at two points (four point bending), 2000) describes the four point bending test for the determination of glass strength. The failure stress is calculated from the vertical force of the testing machine. To determine the difference between...
Conference Paper
Full-text available
The desire to apply annealed float glass with its economic and optical advantages in comparison to tempered glass is limited in part by the reduced edge strength. In the design standard for glass DIN 18008 the edge strength amounts only 80 % of the surface strength. Due to temperature stresses, the edge strength of annealed float glass is a decisiv...
Conference Paper
Transportation vehicles and infrastructures, as part of the mobility sector, play a critical role in environmental protection, as they are responsible for significant amounts of gas emissions that lead to global warming. The railway system could contribute to this aspect, however, there is an urgent need to improve the reliability and availability...
Chapter
When dimensioning facade glazing, various influences such as dead weight, wind and climatic loads (pressure differences) are taken into account. In practice, however, effects due to direct solar irradiance are often neglected, as many cases of damage due to thermally induced glass breakage ("thermal breakage") prove. The temperature differences wit...
Article
Full-text available
Since the beginning of 2021, CEN/TS 19100 Design of Glass Structures has been available in its first three parts. The fourth part is expected soon. This Technical Specification of the European standards organisation CEN is as a pre-standard of a corresponding future Eurocode. These documents constitute the first ever comprehensive design code for t...
Article
The consideration of interaction effects between vehicle and structure is an important aspect in the dynamic analysis of railway bridges. They usually lead to a reduction of the structural responses compared to computations without consideration of the vehicle-bridge interaction. The interaction effects can either be accounted for by Finite Element...
Conference Paper
Full-text available
First published on GPD Theme Park: https://gpd.fi/themepark-editions/december-edition/ Optical anisotropy effects in tempered glass can affect the transparency of glass building envelopes in the form of iridescence. Birefringence is created in the standard tempering process and results from even the smallest principal stress differences across th...
Article
Full-text available
In the practical application of the Bridge Weigh-In-Motion (BWIM) methods, the position of the wheels or axles during the passage of a vehicle is a prerequisite in most cases. To avoid the use of conventional axle detectors and bridge type-specific methods, we propose a novel method for axle detection using accelerometers placed arbitrarily on a br...
Chapter
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Downloadlink: https://www.glasstec.de/cgi-bin/md_glasstec/lib/pub/object/downloadfile.cgi/gtl_Buch_2022.pdf?oid=29013&lang=1&ticket=g_u_e_s_t
Chapter
The range of applications for the comparatively old building material glass has not yet been exhausted. The use of new methods and technologies in research – such as artificial intelligence and additive manufacturing – allows the potential of glass to be exploited increasingly and the realization of innovative applications, such as vacuum insulatin...
Article
Full-text available
Polyhedral Graphic Statics (PGS) is an effective tool for form-finding and constructing complex yet efficient spatial funicular structures. The intrinsic planarity of polyhedral geometries can be leveraged for efficient fabrication and construction using flat sheet materials, such as glass. Our previous research used PGS for the form-finding of a 3...
Article
Full-text available
The bending strength of flat glass panels including the effects of their edges, is commonly determined by means of the four-point bending test method. This is an established and reliable method. However, when testing glass thinner than 3 mm, large deformation may occur. This means that the calculated stresses might not correspond to the actual, as...
Article
Full-text available
The birefringent properties of glass can be well utilized for non-destructive testing of thermally tempered glass. The surface compression stress as well as the compression zone depth of thermally tempered glass is commonly measured with a scattered light polariscope. The measurement with scattered light polariscope provides information about stres...
Article
Full-text available
In the structural design of facade glazing, various types of loads such as dead weight, wind and climatic loads (pressure differences) must be taken into account. In practice, however, there are many cases of damage that can be attributed to direct solar radiation. In these cases, a so-called thermally induced fracture takes place, which can occur...
Article
Full-text available
Bei der additiven Fertigung und beim thermischen Vorspannen von Glas ist dessen Festigkeit für den aufgrund des Herstell‐ bzw. Veredelungsprozesses relevanten Temperaturbereich nur wenig erforscht. Um die Auswirkungen unterschiedlicher Temperaturen auf die Festigkeit des Werkstoffs näher bestimmen zu können, wurde der Doppelringbiegeversuch nach EN...
Conference Paper
Full-text available
The concept of the Digital Twin is being used more and more in general and especially in the AEC sector (Architecture, Engineering and Construction). Among others, this is due to the progress in the computational area and the sensor technologies. This ongoing progress leads to a wide range of applications and just as many users. This uncoordinated...
Preprint
Full-text available
In the practical application of the Bridge Weigh-In-Motion (BWIM) methods, the position of the wheels or axles during the passage of a vehicle is in most cases a prerequisite. To avoid the use of conventional axle detectors and bridge type specific methods, we propose a novel method for axle detection through the placement of accelerometers at any...
Chapter
Building envelopes made of glass are established and popular in modern architecture. For economical and structural reasons, tempered glass with increased strength and thermal shock resistance is used for these high-quality façade projects. The common tempering process creates a residual stress state, which cannot be generated homogeneously over the...
Article
The interfacial adhesion between the interlayer and glass plays a vital role in determining the safety and post-fracture behavior of PVB-laminated glass. To get a better understanding of the delamination behavior of PVB-laminated glass, a series of through-cracked tensile (TCT) tests were carried out. Influences of different PVB adhesion grades (TR...
Article
This paper combines the finite element (FE) homogenisation and structural assessments to conduct the multiscale modelling of laminated functionally graded (FG) porous beams made of closed-cell foams, with a focus on the beam buckling and vibration performances. In the FE homogenisation, representative volume elements (RVEs) are built up according t...
Chapter
Full-text available
The identification of human-structure interaction (HSI) needs flexible ground conditions. A widely used method is the determination of ground reaction forces (GRF) by using portable force plates, with the main drawback of the plates being their predefined measurement zones that obstruct people from their natural gait during locomotion. The current...
Presentation
The desire to apply annealed float glass with their economic and optical advantages is limited by the reduced edge strength due to the cutting process. The edge strength of annealed float glass is a decisive factor especially for insulating glazing due to temperature stress. In standards (e. g. DIN EN 18008), the edge strengths are reduced compared...
Article
Full-text available
In this experimental research a transparent thermoplastic manufactured by the DOW Corporation and known as Surlyn is investigated for use as an interface material in fabrication of an all-glass pedestrian bridge. The bridge is modular in construction and fabricated from a series of interlocking hollow glass units (HGU) that are geometrically arrang...
Article
Full-text available
The Vacuum Insulated Glazing is a highly thermally insulating structure consisting of two (or more) glass sheets, separated by an evacuated gap, and sealed hermetically at the glass edges. An array of support pillars maintains the separation of the panes under the constant load of atmospheric pressure. The performance and durability of the VIG, in...
Article
Full-text available
For the design of façade and roof glazing, loads due to dead weight, climatic loads (IGU - pressure differences), wind and snow are well investigated and are considered in engineering practice. However, glass constructions are also ex-posed to thermally induced stresses due to direct solar irradiation. The standards and guidelines available so far,...
Conference Paper
Full-text available
In this paper a supervised deep learning based approach to extract bridge natural frequencies from acceleration sensors on a passing train is presented. To overcome the problem of obtaining a sufficient amount of acceleration signals with a known corresponding bridge frequency, it is proposed to use transfer learning. Data acquired from simulations...
Article
This study presents a theoretical analysis on the low-velocity impact response of inclined porous nanocomposite beams under various impulsive loads. The laminated beam model consists of multiple layers modelled as closed-cell cellular solids with identical thickness, where each layer contains uniformly distributed internal pores and is reinforced b...
Article
The present contribution proposes a novel method for the indirect measurement of the ground reaction forces (GRF) induced by a pedestrian during walking on a vibrating structure. Its main idea is to formulate and solve an inverse problem in the time domain with the aim of finding the optimal time dependent moving point force describing the GRF of a...
Chapter
Full-text available
Inhalt Einwirkung – Personen Bericht zum Stand der Überarbeitung der DIN 4150 Teil 2 . . . . . 1 Überarbeitete Lastansätze für personeninduzierte Schwingungen nach VDI-Richtlinie 2038 . . . . . 13 Lastansätze, Berechnungsmethoden und Bewertungskriterien in der Praxis zu menscheninduzierten Erschütterungen . . . . . .23 Einwirkung – Schienenfahrzeug...
Article
The present paper is concerned with deriving simplified design equations and charts for modelling in-plane expansion of fractured thermally pre-stressed soda-lime-silica glass panes using the method of equivalent temperature differences (ETD) together with a thermal expansion analogy for strains. The starting point is a theoretical method based on...
Article
This research presents an experimental program and a numerical analysis executed to understand the strength and stiffness properties of polyhedral hollow glass units (HGU) that are intended for use in modular construction of all-glass, compression-dominant, shell type structures. The proposed compression-dominant geometric form has been developed u...
Article
Vacuum insulated glazing (VIG) is a highly thermally insulating window technology, which boasts an extremely thin profile and lower weight as compared to gas-filled insulated glazing units of equivalent performance. The VIG is a double-pane configuration with a submillimeter vacuum gap maintained by small pillars positioned in between the panes, wh...
Article
This study is the first step of a research program organized to contribute to the dream of using recycled paper as a structural element for sustainable design in Civil Engineering. One of the important tasks is to understand the behavior of connections in paper materials. This study presents the results of experimental research carried out to inves...
Article
Full-text available
Within the field of textile construction, textiles are traditionally used either as decorative elements in interior design or as flat textiles in tensile-stressed lightweight constructions (roofs, temporary buildings, etc.). Technical textiles made of glass or carbon fibers are now also used as steel substitutes in concrete construction. There, fla...
Article
Infolge variierender Produktionsbedingungen erfolgt der thermische Vorspannprozess von Gläsern nicht vollständig homogen. Daraus entstehen lokale Unterschiede in den Eigenspannungen. Um die statistischen Verteilungen von charakterisierenden Größen des Eigenspannungsprofils in thermisch vorgespanntem Flachglas zu bestimmen, wurden mehr als 100 Probe...
Article
Ethylenvinylacetat (EVA)‐ und Ionoplastfolien finden immer mehr Anwendung in Verbundgläsern. Im Gegensatz zur Polyvinylbutyral‐Folie, besitzen EVA und Ionoplaste jedoch teilkristalline Bereiche, welche beim Erreichen der Schmelztemperatur schmelzen. Wird die Schmelze abgekühlt, so werden die Kristallite wieder gebildet. Der Schmelz‐ und der Kristal...
Article
Das Interesse an Vakuumisolierglas (VIG), einer thermisch optimierten und dünneren Alternative zu herkömmlichen Mehrscheibenisoliergläsern, wächst. Während die jahrelange Optimierung der bauphysikalischen Eigenschaften bereits dazu führt, dass heute U g ‐Werte von unter 0,4 W/(m ² K) erreicht werden können, fehlen für das mechanische Verhalten dies...
Article
Laminated safety glass is popularly used as facades and structural elements in buildings. For safety concerns, the bonding between glass and interlayer needs to be ensured. The pummel test is one of the most commonly used approaches to evaluate the interfacial adhesion of laminated glass. This paper is concerned with the development of a software-b...
Chapter
Inhalt Einwirkung – Personen Bericht zum Stand der Überarbeitung der DIN 4150 Teil 2 . . . . . 1 Überarbeitete Lastansätze für personeninduzierte Schwingungen nach VDI-Richtlinie 2038 . . . . . 13 Lastansätze, Berechnungsmethoden und Bewertungskriterien in der Praxis zu menscheninduzierten Erschütterungen . . . . . .23 Einwirkung – Schienenfahrzeug...
Chapter
Full-text available
Inhalt Einwirkung – Personen Bericht zum Stand der Überarbeitung der DIN 4150 Teil 2 . . . . . 1 Überarbeitete Lastansätze für personeninduzierte Schwingungen nach VDI-Richtlinie 2038 . . . . . 13 Lastansätze, Berechnungsmethoden und Bewertungskriterien in der Praxis zu menscheninduzierten Erschütterungen . . . . . .23 Einwirkung – Schienenfahrzeug...
Chapter
Inhalt Einwirkung – Personen Bericht zum Stand der Überarbeitung der DIN 4150 Teil 2 . . . . . 1 Überarbeitete Lastansätze für personeninduzierte Schwingungen nach VDI-Richtlinie 2038 . . . . . 13 Lastansätze, Berechnungsmethoden und Bewertungskriterien in der Praxis zu menscheninduzierten Erschütterungen . . . . . .23 Einwirkung – Schienenfahrzeug...
Conference Paper
p>This paper investigates the differences between the maximum vertical bridge acceleration during a train crossing when calculated with moving loads and with vehicle-bridge interaction considering a 2D multi-body model. This influence of the interaction is currently defined for the bridge design by an additional damping value, included in Eurocode...