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Hashemi, B. (author), Maljaars, J. (author), Leonetti, D. (author), Snijder, H.H. (author)Reliability analysis is a crucial phase in assessing the safety status of new and existing structures. One of its applications is to predict the fatigue life of fatigue prone details. Two models are used to formulate the fatigue limit state: S-N curves in combination with Palmgren-Miner damage accumulation rule and linear elastic fracture...article 2017
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Attema, T. (author), Kosgodagan Acharige, A. (author), Morales Nápoles, O. (author), Maljaars, J. (author)A probabilistic model is developed to investigate the crack growth development in welded details of orthotropic bridge decks. Bridge decks may contain many of these vulnerable details and bridge reliability cannot always be guaranteed upon the attainment of a critical crack. Therefore, insight into the crack growth development is crucial in...article 2017
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Numerical investigation into strong axis bending shear interaction in rolled I-shaped steel sectionsDekker, 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.C. (author), Efthymiou, E. (author), Maljaars, J. (author)This paper considers local buckling of perforated square aluminium plates. Plates of various slenderness with simply supported edges and subjected to uniaxial compression are studied using the finite element method. Different perforation patterns are investigated, from a single circular hole to 25 circular holes distributed over the plate. A...article 2016
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Courage, W.M.G. (author), Dragt, R.C. (author), Pijpers, R.J.M. (author), Maljaars, J. (author), Walters, C.L. (author), van der Weijde, G.D. (author)design driver for Offshore Wind Turbine (OWT) substructures and also has an im-pact on operational costs. During service life, inspections are required to detect fa-tigue cracks at an early stage. These cracks may need to be repaired. The costs of in-spections and repair are high for offshore structures. To reduce the cost of energy, it is...article 2016
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Ojeda, O.D. (author), Maljaars, J. (author), Abspoel, R. (author)Thermal gradients often occur in fire exposed structures. This paper considers thermal gradients over the cross-section of steel columns. By means of finite element simulations, the paper demonstrates that these gradients reduce the fiexural buckling resistance of the columns. This is due to the eccentricity in the column created by the...article 2016
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Walters, C.L. (author), Alvaro, A. (author), Maljaars, J. (author)The Fatigue Ductile–Brittle Transition (FDBT) is a phenomenon similar to the fracture ductile to brittle transition, in which the fracture mode of the fatigue cracks changes from ductile transgranular to cleavage and/or grain boundary separation. Fatigue at temperatures below the FDBT has a much different crack growth rate than fatigue above...article 2016
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Salman, Y. (author), Otheguy, M.E. (author), Maljaars, J. (author), Dragt, R.C. (author), van der Putten, S. (author)Offshore Wind power is considered one of the fastest growing maritime sectors and the most promising sources of ‘clean’ energy towards meeting the European targets for 2020 and 2050. The growth of the sector has also been mirrored in other continents like China and US. The technology keeps rapidly growing and the top offshore turbine makers in...article 2016
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van Meerveld, H. (author), Maljaars, J. (author)Voor een monitorsysteem dat aan-geeft wanneer groot onderhoud of renovatie van stalen bruggen nodig is, is in 2014 een (inmiddels uitgebreide) pilot-studie gestart op de Van Brienenoordbrug met een 'akoestische emissie-meetsysteeml. In combinatie met bestaande rekenmodellen moet het AE-systeem, geplaatst op het brug-dek, preciezere informatie...article 2016
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Dragt, R.C. (author), Maljaars, J. (author), Tuitman, J.T. (author), Salman, Y. (author), Otheguy, M.E. (author)Retardation is a load sequence effect, which causes a reduced fatigue crack growth rate after an overload is encountered. Retardation can be cancelled when the overload is followed by an underload. The net effect is beneficial to the fatigue lifetime of Offshore Wind Turbines (OWTs). To be able to take this into account, computationally...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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Maljaars, J. (author), De Matteis, G. (author)Many aluminium structures contain welded and bolted connections that are modeled as one or more equivalent T-stubs – also referred to as tension zone components – for the structural assessment. Knowledge on the structural behavior of such T-stubs is thus essential for proper designs. However, this behavior has never been checked for fire...article 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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Claassen, W. (author), Snijder, H.H. (author), Koot, C.J.G. (author), Maljaars, J. (author)De Hovenring is een schoolvoorbeeld van moeilijk voorspelbare trillingen. Ook wanneer wel direct voorzieningen waren opgenomen in het ontwerp, dan nog zou de problematiek zich hebben aangediend. In de praktijk bleken trillingen op te treden met hoge spanningsranges in grote aantallen, die volgens de analyses op basis van de norm vooraf niet...article 2015
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Maljaars, J. (author), Pijpers, R. (author), Slot, H. (author)Many welded steel structures in marine, offshore, and infrastructural industries are subjected to variable amplitude (VA) fatigue loads. It is well known that the level and sequence of the load cycles can cause crack growth retardation or acceleration and thus influence the fatigue life. An important sequence effect is generated by a large...article 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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Dekker, R.W.A. (author), Snijder, H.H. (author), Maljaars, J. (author)The bending-shear resistance of steel cross-sections is covered in EN 1993-1-1 [1], taking presence of shear into account by a reduced yield stress for the shear area. An experimental investigation on bending-shear interaction of rolled HE280A beams in S235 and S355 was performed by means of 3-point bending tests. Two criteria were considered...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