Analytical model for reinforced concrete under cyclic loading
Xu, Chunjian
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https://hdl.handle.net/2142/20461
Description
Title
Analytical model for reinforced concrete under cyclic loading
Author(s)
Xu, Chunjian
Issue Date
1991
Doctoral Committee Chair(s)
Schnobrich, William C.
Department of Study
Civil and Environmental Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
The finite element method is a very powerful computational technique for computer solution of complex problems. Its formulation can include both geometrical and material nonlinearities at the element level. Unfortunately, the validity of the nonlinear finite element analysis is often limited by the inadequate understanding and modelling of material behavior. In many cases the degree of sophistication of the global structural analysis techniques is far superior to that of the material models being used. This situation is especially true with reinforced concrete structures. As a composite material, reinforced concrete exhibits a highly nonlinear behavior, especially after cracking. Besides material nonlinearities of the constituent materials of steel and concrete, which dominate the pre-cracking response, aggregate interlock, dowel action and bond slip come into the picture of the post-cracking response.
In the present study, a constitutive model for reinforced concrete under cyclic loading is formulated. Concrete is modelled as an incrementally orthotropic material while the stress-strain relationship for steel includes yielding, strain hardening and a Bauschinger effect. The adopted multi-crack model, with which a crack law is associated, takes into account the behavior of each crack interface. Based on relevant experimental observations, one particular constitutive law for cracks is developed. To verify the proposed constitutive model, a number of experimental specimens under either monotonic or cyclic loading are analyzed with the analytical results compared with the corresponding test data.
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