A macro-meso constitutive law for concrete having imperfect interface and nonlinear matrix |
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Authors: | Qing Zhang XiaoZhou Xia |
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Affiliation: | (1) Department of Engineering Mechanics, Hohai University, Nanjing, 210098, China;(2) Institute of Construct, Guangdong University of Technology, Guangzhou, 510006, China |
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Abstract: | The overall behavior of concrete depends on its meso structures such as aggregate shape, interface status, and mortar matrix
property. The two key meso structure characters of concrete, bond status of interface and nonlinear property of matrix, are
considered in focus. The variational structure principle is adopted to establish the macro-meso constitutive law of concrete.
Specially, a linear reference composite material is selected to make its effective behavior approach the nonlinear overall
behavior of concrete. And the overall property of linear reference composite can be estimated by classical estimation method
such as self-consistent estimates method and Mori-Tanaka method. This variational structure method involves an optimum problem
ultimately. Finally, the macro-meso constitutive law of concrete is established by optimizing the shear modulus of matrix
of the linear reference composite. By analyzing the constitutive relation of concrete established, we find that the brittleness
of concrete stems from the imperfect interface and the shear dilation property of concrete comes from the micro holes contained
in concrete.
Supported by the National Natural Science Foundation of China (Grant Nos. 50679022, 90510017, 50539090) and National Basic
Research Program of China (Grant No. 2007CB714104) |
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Keywords: | imperfect interface matrix nonlinear property variational structure principle macro-meso constitutive law concrete |
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