Study On Mechanical Properties Of Coupled PEC Shear Wall Structure With Replaceable Members

In recent years,combined with the research results of steel plate concrete composite shear wall and partially encased concrete structure(PEC structure),domestic researchers proposed a new fabricated steel-concrete composite shear wall(hereinafter referred to as PEC shear wall)structure system,and carried out theoretical and Experimental Research on the fabricated PEC short leg shear wall structure system.The results show that the prefabricated PEC short leg shear wall has good ductility,energy dissipation capacity and superior seismic performance.Replaceable component structure is to concentrate the damage on replaceable components,so that other components of the main structure have no damage or low damage.At present,the research on the structure of replaceable components in shear wall mainly focuses on the shear wall structure with replaceable coupling beam and replaceable corner components or frame shear wall structure.In order to give full play to the advantages of PEC composite shear wall structure,such as high vertical bearing capacity and large seismic ductility,make full use of the excellent yield energy dissipation capacity of steel coupling beam,and improve the post earthquake repairability of the structure,the technology of replaceable corner components and replaceable coupling beam is introduced into the coupled PEC shear wall to form a new type of coupled PEC composite shear wall structure with dual replaceable system.The main contents are as follows:(1)Through theoretical analysis,the reasonable design methods of PEC shear wall and PEC shear wall with replaceable corner components(hereinafter referred to as RPEC shear wall)are obtained.(2)The finite element analysis software ABAQUS is used to simulate the test data in the existing literature.The correctness and reliability of the finite element modeling are verified by comparing the hysteretic curve,skeleton curve and failure mode obtained from the test and finite element simulation.(3)Based on the correctness of the finite element model verified by experiments,the finite element models of PEC shear wall and RPEC shear wall with 170 mm and200 mm wall thickness are designed by using the design method in Chapter 2 with the wall limb width thickness ratio,axial compression ratio,shear span ratio and cavity number as variable parameters.Firstly,the one-way pushover analysis of all the models is carried out,and the variation laws of the bearing capacity,lateral stiffness and failure mode of PEC and RPEC shear walls with the wall limb width thickness ratio,axial compression ratio,shear span ratio and cavity number are obtained.Then,according to the above variable parameter analysis results,the design suggestions of RPEC wall are given.Finally,eight models are selected to analyze the energy dissipation performance of PEC wall and RPEC wall under low cyclic loading.(4)Based on the analysis of the mechanical properties of PEC shear wall and RPEC shear wall,referring to the design method of replaceable coupling beam and taking the coupling ratio as the variable parameter,six basic specimen models are designed.Then,the static elastic-plastic analysis of the coupled partially encased steel-concrete composite shear wall(hereinafter referred to as CPEC shear wall)and the coupled partially encased steel-concrete composite shear wall with dual replaceable system(hereinafter referred to as RCPEC shear wall)is carried out to study the influence of the coupling ratio and the introduction of replaceable components on the structural mechanical performance and seismic performance And the post earthquake recoverable performance of RCPEC shear wall is evaluated.