A MESOSCALE MODEL FOR CONCRETE UNDER BLAST LOADING

【Author】

X.Q.Zhou~*,University of Western Australia,Australia H.Hao,University of Western Australia,Australia

【Abstract】

<正>Concrete as a main structural material has been widely used all over the world. It is of interest for researchers to understand the damage process of concrete material under blast loading.Concrete is a composite material,consisting of aggregate bounded by cement paste,which makes the material behaviour of concrete very complicated.The distribution of coarse aggregates affects the crack pattern and the fragment size distribution when it is under blast loads.But most of the present dynamic concrete material models are based on homogeneous material assumption,which often makes the prediction of fragment size distribution and crack propagation of concrete material under blast loads unreliable.In this study,a mesoscale heterogeneous model for concrete material is developed.In the mesoscale model,the concrete is assumed to consist of two phases,that is,coarse aggregates and mortar matrix with fine aggregate dissolved in it.The high strength coarse aggregate is assumed to be circular with a randomly distributed radius.The aggregate particle size distribution is based on one of the most popular aggregate distributions,i.e.,Fuller's curve.The spatial distribution of coarse aggregate is also assumed to be random in the structure components.With the suggested distribution a dynamic damage model for concrete is developed.The material model is incorporated in the hydrocode AUTODYN.As a numerical example,the dynamic damage process of a concrete slab under blast loads is analyzed.Taguchi method is adopted to analyse the effect of some crucial parameters.

【Keywords】

Mesoscale model;;Blast loading;;Numerical simulation;;Concrete;;Taguchi method

References

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Total: 29 articles

  • [1] ZHOU Xiaoqing,HAO Hong,KUZNETSOV Valerian A,WASCHL John (School of Civil and Resource Engineering, The University of Western Australia, Australia; Weapons System Division, Defence Science and Technology Organisation, Department of Defence, Australia), Numerical Calculation of Concrete Slab Response to Blast Loading, Transactions of Tianjin University,
  • [2] Z Agioutantis;;C Stiakakis;;S Kleftakis, Numerical simulation of the mechanical behaviour of epoxy based mortars under compressive loads, Computers and Structures,
  • [3] M. Katayama;;M. Itoh;;S. Tamura;;M. Beppu;;T. Ohno, Numerical analysis method for the RC and geological structures subjected to extreme loading by energetic materials, International Journal of Impact Engineering,
  • [4] L.Javier Malvar;;John E. Crawford;;James W. Wesevich;;Don Simons, A plasticity concrete material model for DYNA3D, International Journal of Impact Engineering,

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