Study On Seismic Behavior Of Rectangular Precast Shear Wall With Energy-dissipating Vertical Joints

Based on the existing cast-in-place and fabricated shear wall structures,a rectangular energy dissipation prefabricated shear wall with vertical joints is proposed according to the characteristics of large lateral stiffness,small horizontal displacement and poor ductility.A vertical through joint is set in the shear wall and metal dampers are added to connect two wall limbs.The mechanical properties and seismic performance of the shear wall structure were analyzed through low-cycle cyclic loading test.At the same time,the damaged specimens were reinforced with carbon fiber cloth,and then the mechanical properties and seismic performance of the reinforced specimens were analyzed.The main contents include the following:1)According to the research and analysis of relevant norms at home and abroad,combined with the mechanical mechanism of prefabricated shear wall structure proposed by different scholars,three rectangular energy dissipation prefabricated shear wall with vertical joints and one rectangular ordinary cast-in-place shear wall comparison specimen were designed and fabricated.Through the low-cycle cyclic loading test of the specimen,the failure mechanism and mechanical mechanism of the rectangular fabricated shear wall specimen were analyzed,and the mechanical properties of the rectangular energy dissipation prefabricated shear wall with vertical joint were systematically studied.2)The ductility,energy dissipation capacity,hysteretic characteristics,stiffness and attenuation law of the rectangular energy dissipation prefabricated shear wall with vertical joint were systematically studied by applying low cyclic loading.The effects of axial compression ratio,reinforcement ratio and concrete strength on the seismic performance of prefabricated shear walls were investigated.The contribution and influence of energy dissipation vertical joints,dampers and other factors on the overall structural bearing capacity and seismic performance are studied.The results show that the ductility of the prefabricated shear wall is good,the yield energy dissipation of the damper improves the seismic performance of the structure,and plays a reliable and stable connection.The overall seismic performance of the shear wall structure is good.3)On the basis of the existing tests,the damaged prefabricated shear wall specimens were reinforced by carbon fiber cloth,and the low-cycle reciprocating load test was carried out again.The bearing capacity,deformation capacity,hysteretic performance and energy consumption of the reinforced specimens were obtained.The test results were compared with the specimens before reinforcement to study the mechanical properties and seismic performance of the shear wall structure before and after reinforcement.The results show that the CFRP reinforcement can effectively inhibit the crack extension and the spalling of concrete,showing good bearing capacity and energy dissipation capacity.The research results can provide reference for the reinforcement design.Figure 31;Table 11;Reference 60...