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Xu, Q. (author), Hofmeyer, H. (author), Maljaars, J. (author)
A multi-scale approach is proposed to simulate the fire resistance of panels used in façades of buildings: Using existing models, fire is modelled by CFD, its effects in the façade found via a thermodynamical model. Then a thermomechanical model predicts the mechanical behaviour, using linear elastic springs for the connections holding the...
conference paper 2019
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Hashemi, B. (author), Maljaars, J. (author), Snijder, H.H. (author)
In order to design structural details of bridges for fatigue, the current version of the Eurocode for steel structures recommends partial factors for fatigue resistance based on the consequences of failure and on the maintenance method. The safe-life method is used for details where local formation of cracks could rapidly lead to failure or for...
conference paper 2019
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Hofmeyer, H. (author), Vervoort, E.M.C. (author), Snijder, H.H. (author), Maljaars, J. (author)
An existing theoretical model indicates that the behaviour of trapezoidal steel sheeting under combined web crippling and bending moment may be modelled by only the sheeting's compressed flange. Therefore, this paper presents finite element models that simulate only the compressed flange of the sheeting, applying a prescribed displacement field...
conference paper 2018
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Maljaars, J. (author)
Viele der existierenden europischen Eisenbahn- und Autobahnbrkken erreichen ihre Nennlebensdauer ftir Stahlermdung, obwohl eine langere Nutzungsdauer angestrebt wird. Eine Meiglichkeit, die Nutzungsdauer gefahrlos zu verlkigern, besteht darin, die Brcken in krzeren Abstkiden auf Ermdungsrisse zu prfen oder zu uberwachen und eventuelle Risse zu...
conference paper 2018
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Leonetti, D. (author), Maljaars, J. (author), Snijder, H.H.B. (author)
Estimating and reducing uncertaintyin fatigue test data analysis is a relevant task in order to assess the reliability of a structural connection with respect to fatigue. Several statistical models have been proposed in the literature with the aim of representing the stress range vs. endurance trend of fatigue test data under constant amplitude...
conference paper 2018
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Leonetti, D. (author), Maljaars, J. (author), Snijder, H.H.B. (author)
Standards and guidelines for the fatigue design of riveted connections make use of a stress range-endurance (S-N) curve based on the net section stress range regardless of the number and the position of the rivets. Almost all tests on which S-N curves arebased, are performed with a minimum number of rivets. However, the number of rivets in a row...
conference paper 2018
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Leonetti, D. (author), Hashemi, B. (author), Allaix, D.L. (author), Maljaars, J. (author)
This paper investigates the differences in the predicted fatigue life of transverse butt weld joints and cover-plated beams considering statistically based fitting methods on fatigue test data and comparing the results with the S-N relation proposed in international standards. The test data fitting are performed by employing the Least Square...
conference paper 2017
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Dekker, R.W.A. (author), Snijder, H.H. (author), Maljaars, J. (author)
Clause 6.2 of EN 1993-1-1 covers the cross-sectional resistance of steel sections. The bending-shear interaction design rules for I-shaped cross-sections make use of a reduced yield stress for the web area. On this basis, a reduced design plastic resistance moment allowing for the shear force is presented. The effect of shear on the bending...
conference paper 2017
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Dekker, R.W.A. (author), Snijder, B.H. (author), Maljaars, J. (author)
Clause 6.2.8 of EN 1993-1-1 covers the design rules on bending-shear resistance, taking presence of shear into account by a reduced yield stress for the shear area. Numerical research on bending-shear interaction by means of the Abaqus Finite Element modelling soft-ware is presented. The numerical model is validated against the experimental...
conference paper 2016
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Maljaars, J. (author)
handrail. This paper demonstrates that aluminium alloys are in principle also suited for heavy loaded structures, such as decks of traffic bridges and helicopter landing platforms. Recent developments in fatigue research is discussed and future research, required for full application of aluminium in heavy loaded structures is identified. The...
conference paper 2016
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Scheperboer, I. (author), Efthymiou, E. (author), Maljaars, J. (author)
Aluminium plates containing a single hole or multiple holes in a row are recently becoming very popular among architects and consultant engineers in many constructional applications, due to their reduced weight, as well as facilitating ventilation and light penetration of the buildings. However, there are still uncertainties concerning their...
conference paper 2016
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Kosgodagan, A. (author), Morales-Napoles, O. (author), Maljaars, J. (author), Courage, W.M.G. (author)
Markov-based models for predicting deterioration for civil infrastructures are widely recognized as suitable tools addressing this mechanism. The objective of this paper is to provide insights regarding a network of orthotropic steel bridges in terms of degradation. Consequently, a model combining a dynamic Bayesian network and a Markov chain is...
conference paper 2016
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Kosgodagan, A. (author), Morales-Napoles, O. (author), Maljaars, J. (author), Yeung, T. (author), Castanier, B. (author)
Bridge lifetime pose an important challenge in terms of maintenance for decision makers or asset managers. In this regard Markov chains have been used successfully in practice as models for bridge deterioration. However, one limitation of Markov chains can be the assessment of the transition probabilities. In this paper, we propose an approach...
conference paper 2015
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Attema, T. (author), Courage, W.M.G. (author), Maljaars, J. (author), van Meerveld, H. (author), Paulissen, J.H. (author), Pijpers, R.J.M. (author), Slobbe, A.T. (author)
This paper presents a monitoring and modelling methodology to assess the current and future conditions of steel bridges subjected to fatigue cracking. Steel bridges are subjected to fatigue cracking as a result of fluctuating stresses caused by the crossing of heavy vehicles. Specifically for orthotropic steel bridge decks, fatigue cracking is...
conference paper 2015
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Kosgodagan, A. (author), Morales-Napoles, O. (author), Maljaars, J. (author), Bastanier, B. (author), Yeung, T.G. (author)
Maintenance for highway bridges is crucial in order to keep the network in a satisfactory condi-tion for users but is also a costly affair. This paper proposes a dynamic, Bayesian network-based model to provide cost-efficient strategies in the context of bridge network management. Characteristics related to un-certainties in both the degradation...
conference paper 2015
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Maljaars, J. (author), Snijder, H.H. (author)
The 'Hovenring' is a bicycle roundabout flyover built as a signature bridge with a central steel pylon carrying a circular bridge deck suspended through stay-cables. Shortly after installation of the bridge, the stay-cables turned out to vibrate in the wind due to vortex shedding. These vibrations have possibly caused fatigue damage in the...
conference paper 2013
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Maljaars, J. (author), Gration, D. (author), Vonk, E. (author), van Dooren, F. (author)
Orthotropic deck structures are used in many steel bridges. Due to the typical detailing applied as around 1970, a significant number of deck structures constructed in that period suffer from fatigue damage. In many countries cracks have been detected, in particular in the weld between the deck plate and the trapezoidal stiffener. These cracks...
conference paper 2013
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TNO Bouw en Ondergrond (author), Meacham, B. (author), Park, H. (author), Engelhardt, M. (author), Kirk, A. (author), Kodur, V. (author), van Straalen, IJ.J. (author), Maljaars, J. (author), van Weeren, K. (author), de Feijter, R. (author), Both, K. (author)
On the morning of May 13, 2008, a fire that started in a coffee vending machine on the 6th floor of the 13-story Faculty of Architecture Building at the Delft University of Technology (TUD), Delft, the Netherlands, quickly developed into an extreme loading event. Although all building occupants evacuated safely, the rapid fire spread severely...
conference paper 2010
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Maljaars, J. (author), TNO Bouw en Ondergrond (author)
The temperature-dependent reduction factors on the yield stress in codes for steel structures, ky, are derived using a constant heating rate and a constant stress, where the influence of creep is implicitly taken into account. This paper considers the material properties of steel and aluminium on the basis of a Natural Fire Safety Concept, where...
conference paper 2010
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Maljaars, J. (author), Soetens, F. (author), TNO Bouw en Ondergrond (author)
conference paper 2006
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