A sophisticated simulation for the fracture behavior of concrete material using XFEM
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The development of a powerful numerical model to simulate the fracture behavior of concrete material has long been one of the dominant research areas in earthquake engineering. A reliable model should be able to adequately represent the discontinuous characteristics of cracks and simulate various failure behaviors under complicated loading conditions. In this paper, a numerical formulation, which incorporates a sophisticated rigid-plastic interface constitutive model coupling cohesion softening, contact, friction and shear dilatation into the XFEM, is proposed to describe various crack behaviors of concrete material. An effective numerical integration scheme for accurately assembling the contribution to the weak form on both sides of the discontinuity is introduced. The effectiveness of the proposed method has been assessed by simulating several well-known experimental tests. It is concluded that the numerical method can successfully capture the crack paths and accurately predict the fracture behavior of concrete structures. The influence of mode-II parameters on the mixed-mode fracture behavior is further investigated to better determine these parameters.
Keywordsfracture behavior concrete material earthquake engineering interface constitutive model XFEM
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The authors want to express their sincere gratitude to P. Benson Shing of the University of California at San Diego and Ioannis Koutromanos of Virginia Polytechnic Institute and State University for their kindly help. This investigation is supported by the Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (No. 2016A01), the National Key Research and Development Plan (No. 2016YFC0701108), the National Natural Science Foundation of China (Nos. 51238012, 51322801), the Outstanding Talents Jump Promotion Plan of Basic Research of Harbin Institute of Technology. This support is greatly appreciated.
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