Searched for: author%3A%22Weerheijm%2C+J.%22
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Boonacker, B. (author), van Doormaal, J.C.A.M. (author), Weerheijm, J. (author)
Safety evaluation, risk assessment and decisions on prevention and protection measures require simple fast running methods. It is a challenge to develop a consequence analysis method that is relatively simple, but still has the ability to discern between different cases, scenarios and buildings. In the past years, TNO has participated in the FP7...
conference paper 2014
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Agar Ozbek, A.S. (author), Weerheijm, J. (author)
Porous concrete is a special type of cementitious material incorporating a high amount of meso-size air pores that makes its characteristics markedly different from normal concrete. Therefore, it is being investigated for various applications, aiming to benefit from the presence of the air voids in its structure, such as permeability, noise...
conference paper 2014
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Weerheijm, J. (author), van den Berg, A.C. (author)
Tunnel accidents with transports of dangerous goods may lead to explosions. Risk assessment for these accidents is complicated because of the low probability and the unknown, but disastrous effects expected. Especially the lack of knowledge on the strength of the explosion and the consequences for the tunnel user, the tunnel lining and the...
conference paper 2014
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Carton, E.P. (author), Weerheijm, J. (author), Ditzhuijzen, C. (author), Tuinman, I. (author)
The fragmentation of ceramic tiles under ballistic impact has been studied. Fragments and aerosol (respirable) particles were collected and analyzed to determine the total surface area generated by fracturing (macro-cracking and comminution) of armor grade ceramics. The larger fragments were collected and the mass distribution was obtained from...
conference paper 2014
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Lu, Y. (author), Xu, J. (author), Weerheijm, J. (author)
This paper presents a numerical modelling study on the simulation of the cracking process and fracture energy in concrete under high strain rate. To capture the stress wave effect and the damage evolution at the meso-length scale, both a homogeneous model with a millimetre-resolution mesh and an explicit heterogeneous mesoscale model with random...
conference paper 2013
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Forquin, P. (author), Riedel, W. (author), Weerheijm, J. (author)
Owing to their low tensile failure strain, concrete is a difficult material to test under dynamic tensile loading. Indeed, conventional testing apparatuses such as high-speed hydraulic presses or Split Hopkinson Bar facilities rely on a mechanical balance of the specimen implying a short round-trip time in the specimen in comparison with the...
bookPart 2013
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Khoe, Y.S. (author), Tyler Street, M.D. (author), Maravalalu Suresh, R.S. (author), Weerheijm, J. (author)
Protection against weapon effects like ballistic impacts, fragmenting shells and explosions is the core business of the Explosions, Ballistics and Protection department of TNO (The Netherlands). Experimental and numerical research is performed to gain and maintain the knowledge to support the Dutch MoD and the industry to evaluate and develop...
conference paper 2013
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Weerheijm, J. (author), van Breugel, K. (author)
The strength of concrete is its heterogeneous composition. It is a system that is formed by the chemical process of hydration, producing crystalline and amorphous reaction products interlocking and binding the aggregates together. The material grows in time, resulting in a resilient system that is sufficiently strong to carry loads but can also...
bookPart 2013
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Agar-Ozbek, A.S. (author), Weerheijm, J. (author), Schlangen, E. (author), van Breugel, K. (author)
Porous concrete incorporates a high percentage of meso-size air voids that makes its mechanical characteristics remarkably different from normal concrete. A research project was undertaken to design a special type of porous concrete, that fractures into small fragments when exposed to impact loading while having sufficient static strength, to be...
article 2013
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Weerheijm, J. (author), Forquin, P. (author)
The response of concrete up to complete failure in tension is represented in the load deformation relation. The characteristic parameters are the ultimate strength, stiffness in the ascending branch and the fracture energy. All these parameters depend on concrete composition and environmental conditions, as discussed in the previous chapters....
bookPart 2013
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van der Voort, M.M. (author), Weerheijm, J. (author)
The handling of explosives and ammunition introduces a safety risk for personnel and third parties. Accidents related to storage, transport and transshipment may result in severe injury and material damage. Dispersion of structural debris is one of the main hazards resulting from detonations inside structures. Reliable prediction models for...
article 2013
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Weerheijm, J. (author)
bookPart 2013
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Ozbek, A.S.A. (author), Weerheijm, J. (author), Schlangen, E. (author), van Breugel, K. (author)
Porous concrete is used in many applications that require permeability, noise absorption or thermal insulation. However, its response under dynamic loading is generally not considered. Porous concrete has a characteristic of forming multiple cracks and subsequently fracturing into small fragments when exposed to impact loading. Therefore, with...
conference paper 2013
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O┼żbolt, J. (author), Weerheijm, J. (author), Sharma, A. (author)
The behavior of concrete structures is strongly influenced by the loading rate. Compared to quasi-static loading, on meso and macro-scale concrete loaded by impact loading acts in a different way. First, there is a strain-rate influence on strength, stiffness, ductility, and, second, there are inertia forces activated which influence the...
conference paper 2013
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van der Voort, M.M. (author), Weerheijm, J. (author), van Wees, R.M.M. (author), van Dongen, P. (author)
The handling of explosives and ammunition introduces a safety risk for personnel and third parties. Accidents related to storage, transport and transhipment may result in severe injury and material damage. TNO has developed a number of tools to quantify the consequences and risks of accidental explosions. Risk is defined as the multiplication of...
public lecture 2013
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Agar Ozbek, A.S. (author), Weerheijm, J. (author), Schlangen, E. (author), van Breugel, K. (author)
Porous concrete is used as a construction material in various applications mainly as a permeable cementitious material. However, its response under impact loading is generally not considered. Due to the high percentage of its intentional meso-size air pores, porous concrete has a moderate static strength compared to normal concrete while its...
article 2013
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Weerheijm, J. (author), Stolz, A. (author), Riedel, W. (author), Mediavilla Varas, J. (author)
The Klotz Group (KG), an international group of experts on explosion safety, investigates the debris throw hazard associated with the accidental detonation of ammunition in reinforced concrete (RC-) structures. Experiments are combined with engineering models but also with results of advanced computational modeling, which is the topic of this...
conference paper 2012
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Agar-Ozbek, A.S. (author), Weerheijm, J. (author), Schlangen, E. (author), van Breugel, K. (author)
In this study, an experimental configuration that reveals the dynamic response of porous concretes in a drop weight impact test was introduced. Through the measurement of particle velocity at the interface, between the impactor and the concrete target, the dynamic response was obtained in an easily applicable way. Laser Doppler velocimetry (LDV)...
article 2012
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van Doormaal, J.C.A.M. (author), Weerheijm, J. (author), van het Veld, B.F.P. (author), Boonacker, B. (author)
SPIRIT is an acronym for Safety and Protection of built Infrastructure to Resist Integral Threats. Within the 7th framework of the EU, the SPIRIT consortium was formed to bring the required expertise regarding protection of infrastructure against terrorist threats together, to make these commonly available and to find solutions that can be...
conference paper 2012
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Weerheijm, J. (author), Vegt, I. (author)
Data on the dynamic fracture energy of concrete are scarce and also not consistent due to different test methods, data analyses and definitions. In [1] the authors summarized and evaluated the test methods. Suggestions for the standardization of dynamic tensile testing were given. In the current paper the discussion is continued. First,...
conference paper 2011
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