Study On Seismic Behavior Of Concrete-filled Steel Tubular Fabricated Shear Wall

The prefabricated structure is made of factory prefabricated components,which greatly improves the production efficiency,meets the requirements of energy saving,water saving,land saving,material saving and environmental protection for green construction,and is conducive to ensuring the construction quality.The fabricated shear wall structure has good bearing capacity,lateral stiffness and seismic performance.It is often used in high-rise and super high-rise buildings,and it is easy to achieve mass production in factories.It is an important direction of future development.However,the development time of prefabricated shear wall is not long,and there are deficiencies in theoretical research and experimental research.In this paper,the quasi-static test and numerical simulation analysis of a built-in concrete-filled steel tubular assembly shear wall are carried out(1)Based on the review of domestic and foreign research literature on prefabricated shear wall and concrete-filled steel tube shear wall,the research status of concrete-filled steel tube shear wall is summarized.On this basis,a new built-in concrete-filled steel tube assembly shear wall is proposed,in which the concrete-filled steel tube replaces the transverse and longitudinal reinforcement in the traditional shear wall boundary element.(2)Four built-in concrete-filled steel tubular shear wall specimens and one integral cast-in-place reinforced concrete shear wall specimens were tested under low cycle cyclic cyclic cyclic loading to obtain the failure mode of each specimen,and the hysteretic curve,skeleton curve,ductility,stiffness,energy consumption capacity,wall sliding,joint opening and closing conditions of each specimen were analyzed.The results show that CFST shear wall has better seismic performance than RC shear wall under the same conditions;the steel tube at the joint is well connected with the high-strength mortar sleeve;with the increase of axial compression ratio,the stiffness of the shear wall at the main stress stage is significantly improved,and the ductility slightly reduced.(3)Using the finite element software ADINA to establish the separate model,the numerical simulation of five shear wall models is carried out.The results of hysteretic curve,skeleton curve,failure form and stress situation obtained through the analysis and calculation are compared with the test results to verify the accuracy of the model,which shows that the non coordinated parameters,spring element and contact setting selected in the model are feasible.(4)The maximum displacement of the model is within 55 mm,which is not the displacement of the wall when it is damaged.It shows that the seismic performance of the model is good,and that the built-in concrete-filled steel tubular shear wall has good seismic performance,which provides a reference for the design of prefabricated concrete-filled steel tubular shear wall.