The Stress Concentration Analysis Of Slab End Basing On Contact Problem

Contact problem is prevalent in engineering structures.In civil engineering,it is a typical contact problem that between reinforced concrete hollow slab and rubber bearing,because of the existence of contacts,the slab end stress concentration situation is very serious.At present,the real stress in the beam end is not very clear,and there just listed some structural measures to ensure the safety of that area on the norms.In this paper,by considering the contact between hollow slab and rubber bearing to study the stress concentration issue.To study the problem has two difficulties:one is non-linear analysis of reinforced concrete,another one is non-linear contact analysis.In chapterⅡ,there is easy introduction of the basic concepts for reinforced concrete non-linear finite element analysis,including the failure criterion of concrete,material constitutive relations and finite element model of reinforced concrete and so on.ChapterⅢdiscussed the finite element solving methods for contact problem and a simple overview for solving the contact problem by ABAQUS.In order to ensure the validity of finite element analysis for reinforced concrete hollow slab.In chapterⅣ,there is an example that finite element analysis on a square slab by ABAQUS,in order to study the effect of follow-up tensile hardening parameters to reinforced concrete finite element analysis,results of the study shown when cracking strain reached 1×10^-3 and complete loss of tensile stress,the related hardening curve corresponding the test results.Using the tensile hardening parameter,made non-linear finite element analysis for a simply supported beam of reinforced concrete,by comparing the result of finite element analysis and the theoretics of material mechanics, it is proved nonlinear analysis of reinforced concrete is effective by ABAQUS.Using ABAQUS to build the finite element model of reinforced concrete hollow slab and rubber bearing,simulate contact effect between them by set contact property. By analysis of the middle section stress of the hollow slab in the two situations of consider contact and not consider contact,verified the accuracy of contact finite element model in that situation.Made a more detailed analysis of stress concentration on the slab end and the contact stress,listed the detail of the stress analysis results in the cross-section of slab end and the contact stress between hollow slab and rubber bearing, which gave a reference for the design and construction of the slab end.