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Lantsoght, E.O.L. (author), de Boer, A. (author), van der Veen, C. (author)Existing reinforced concrete solid slab bridges in the Netherlands are re-assessed for shear based on a Unity Check: the ratio of the shear stress caused by the applied loads to the shear capacity of the concrete cross-section. The governing shear stress resulting from the self-weight, weight of the wearing surface, distributed and concentrated...journal article 2017
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Lantsoght, E.O.L. (author), van der Veen, C. (author), de Boer, A. (author), Hordijk, D.A. (author)Proof load testing is part of the engineering practice, and can be particularly useful for the rating of existing bridges. This paper addresses how reliability-based concepts can be used in combination with proof load testing, and discusses how this approach differs from the current practice for proof load testing. Whereas the calculation...journal article 2017
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Lantsoght, E.O.L. (author), van der Veen, C. (author), de Boer, A. (author), Hordijk, D.A. (author)Load testing of bridges is a practice that is as old as their construction. In the past, load testing gave the traveling public a feeling that a newly opened bridge is safe. Nowadays, the bridge stock in many countries is aging, and load testing is used for the assessment of existing bridges. This paper aims at giving an overview of the current...journal article 2017
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Hemelaar, S. R. (author), de Boer, P. (author), Chipaux, M. (author), Zuidema, W. (author), Hamoh, T. (author), Perona Martinez, F. (author), Nagl, A. (author), Hoogenboom, J.P. (author), Giepmans, B. N.G. (author), Schirhagl, R. (author)Nanodiamonds containing fluorescent nitrogen-vacancy centers are increasingly attracting interest for use as a probe in biological microscopy. This interest stems from (i) strong resistance to photobleaching allowing prolonged fluorescence observation times; (ii) the possibility to excite fluorescence using a focused electron beam ...journal article 2017
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Lantsoght, E.O.L. (author), van der Veen, C. (author), Hordijk, D.A. (author), de Boer, A. (author)As the bridge stock in the Netherlands and Europe is ageing, various methods to analyze existing bridges are being studied. Proof load testing of bridges is an option to experimentally demonstrate that a given bridge can carry the prescribed live loads. Based on extensive research on proof load testing of reinforced concrete slab bridges carried...journal article 2017
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Lantsoght, E.O.L. (author), Koekkoek, R.T. (author), Yang, Y. (author), van der Veen, C. (author), de Boer, A. (author), Hordijk, D.A. (author)Proof load testing can be a suitable method to show that a bridge can carry the required loads from the code without distress. This paper addresses the preparation, execution, and analysis of a proof load test on a four-span reinforced concrete solid slab bridge, viaduct de Beek. The bridge has one lane in each direction, but was restricted to a...conference paper 2017
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Lantsoght, E.O.L. (author), Koekkoek, R.T. (author), van der Veen, C. (author), Hordijk, D.A. (author), de Boer, A. (author)For existing bridges, proof-load testing can be a suitable assessment method. This paper addresses the evaluation of a posted reinforced concrete slab bridge over a highway through proof-load testing, detailing the preparation, execution, and analysis of the test. As the target proof-load and the required measurements for proof-load testing...journal article 2017
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de Boer, J.S. (author)This paper is a partial review of the literature on ‘social preferences’. There are empirical findings that convincingly demonstrate the existence of social preferences, but there are also studies that indicate their fragility. So how robust are social preferences, and how exactly are they context dependent? One of the most promising insights...journal article 2017
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Ghafaryasl, B. (author), Baart, Robert (author), de Boer, J.F. (author), Vermeer, K.A. (author), van Vliet, L.J. (author)Optical coherence tomography (OCT) yields high-resolution, three-dimensional images of the retina. A better understanding of retinal nerve fiber bundle (RNFB) trajectories in combination with visual field data may be used for future diagnosis and monitoring of glaucoma. However, manual tracing of these bundles is a tedious task. In this work,...conference paper 2017
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Verhagen, W.J.C. (author), Curran, R. (author), de Boer, L.W.M. (author)Costs associated with unscheduled and preventive maintenance can contribute significantly to an airline's expenditure. Reliability analysis can help to identify and plan for maintenance events. Reliability analysis in industry is often limited to statistically based approaches that incorporate failure times as...conference paper 2017
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De Witt, A. (author), de Boer, Joop (author), Hedlund, Nicholas (author), Osseweijer, P. (author)For addressing climate change, public support for changes in policy is needed, as well changes in individual lifestyles. Both of these appear to be intimately related with people's worldviews. Understanding these worldviews is therefore essential. In order to research and 'map' them, we translated the theoretical 'Integrative Worldview...journal article 2016
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van Wesenbeeck, B (author), de Boer, W.B. (author), Narayan, Siddharth (author), van der Star, Wouter R L (author), de Vries, Mindert B. (author)Adaptation planning for flood risk forms a significant part of global climate change response. Engineering responses to higher water levels can be prohibitively costly. Several recent studies emphasize the potential role of ecosystems in flood protection as adaptive risk reduction measures while also contributing to carbon fixation. Here, we...journal article 2016
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- de Boer, Arnoud (author), van Loenen, B. (author), Jorna, Frans (author), Van de Velde, Rob (author) report 2016
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- de Boer, D.S. (author) report 2016
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Lantsoght, E.O.L. (author), van der Veen, C. (author), Walraven, J.C. (author), de Boer, A. (author)A 55-year-old bridge showed large cracking in the approach bridge caused by restraint of deformation and support settlement. After repair, it was uncertain at which crack width the traffic loads on the bridge should be further restricted. The shear capacity was calculated by counting on the aggregate interlock capacity of a supposedly fully...journal article 2016
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Lantsoght, E.O.L. (author), van der Veen, C. (author), de Boer, A (author), Hordijk, D.A. (author)In the Netherlands, the shear capacity of a large number of existing reinforced concrete solid slab bridges is subject to discussion, as initial assessments indicated that their capacity was insufficient. In certain cases, the deterministic value of the moment capacity is larger than the deterministic value of the shear capacity. However, when...journal article 2016
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Lantsoght, E.O.L. (author), Yang, Y. (author), Tersteeg, R.H.D. (author), van der Veen, C. (author), de Boer, A (author)Proof loading of bridges is an option to study existing bridges when crucial information is lacking. When proof loading is chosen, the question arises which maximum load should be attained during the test to demonstrate sufficient capacity, and which criteria, the “stop criteria”, based on the measurements during the test, would indicate that...conference paper 2016
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Yang, Y. (author), van der Veen, C. (author), Hordijk, D.A. (author), de Boer, A. (author)Assessment of the capacity of the existing infrastructures has become more relevant in the recent years. With regard to the concrete bridges, the shear capacity of a large amount of existing concrete slab bridges reinforced with plain (smooth) bars are of concern. However, it was argued that the shear formula that is currently adapted in the...conference paper 2016
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Yang, Y. (author), Hordijk, D.A. (author), de Boer, A. (author)Proof loading has been considered as an effective approach in the assessment of existing concrete bridges. This paper presents a study of acoustic emission measurement in a proof loading of an ASR affected concrete slab bridge (Zijlweg bridge). Because of the uncertainty on the mechanical properties of the ASR affected concrete. The attenuation...conference paper 2016
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Yang, Y. (author), van der Veen, C. (author), Hordijk, D.A. (author), de Boer, A. (author)This paper presents an experimental research program aiming at assessing the current code provisions of vmin. A large test series was carried out, by varying the reinforcement ratio and loading conditions, the minimum average shear stress that can cause shear failure of a specimen with different depth, concrete strength is determined. The three...conference paper 2016