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PROCEEDINGS OF THE EIGHTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping, G. Montero and R. Montenegro
Nonlinear Damage Analysis of a Reinforced Concrete Short-Pier Shear Wall Specimen
J. Li and Y. Cao
Department of Building Engineering, Tongji University, Shanghai, China
J. Li, Y. Cao, "Nonlinear Damage Analysis of a Reinforced Concrete Short-Pier Shear Wall Specimen", in B.H.V. Topping, G. Montero, R. Montenegro, (Editors), "Proceedings of the Eighth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 7, 2006. doi:10.4203/ccp.83.7
Keywords: elasto-plastic damage constitutive model, nonlinear analysis, damage evolution, short-pier shear wall, coupling beam, stress pattern, internal force redistribution, tensile damage, shear damage.
This paper presents a nonlinear analysis taking into account damage evolution to simulate a short-pier shear wall specimen with twin coupling beams. The numerical results obtained in this study mainly rest with three parts: the experiment of a new short-pier shear wall specimen with twin coupling beams, a novel damage energy release rate-based elasto-plastic damage constitutive model for concrete and the user-defined material subroutine(UMAT) provided by the engineering simulation program ABAQUS.
In virtue of the yielding of twin coupled beams earlier than the failure of the wall panels as well as the subsequent internal force redistribution, a short-pier shear wall specimen is designed as an energy dissipative structure superior to ordinary shear walls. Test observations during the whole loading process have verified its excellent ductility and energy dissipative capacity.
As a synthesis of the continuum damage mechanics and the plastic mechanics, a novel rate-independent elasto-plastic model for concrete is developed within the framework of classical continuum damage mechanics [1,2,3], whose basic principles can be summarized as:
By means of the user-defined material subroutine(UMAT) supplied by ABAQUS in solving nonlinear problems , a numerical simulation of the short-pier shear wall specimen with twin coupling beams is implemented in this paper. A finite element model meshed by CPRS8R elements and a new convergence criterion named double control by load and displacement are adopted to obtain the macro and micro mechanical responses of the test specimen. By virtue of the stress patterns at typical levels of the free-end displacement, a series of distinctive structural responses are disclosed in a real and vivid way, namely homogeneous compression of the specimen, yielding of the coupled beams, internal force redistribution, root stress concentration and overall crushing of the wall panel at the compression side. Furthermore the corresponding tensile damage states and shear damage states in the course of damage evolution process are particularly reproduced to set up a brand-new nonlinear analytical mode from the constitutive model to the structural responses.
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