Research On The Mechanical Behaviors Of Assembled Monolithic Concrete Shear Wall With Bolted Connection

With the accelerating pace of urbanization in China,more and more people are entering the cities.This places new demands on the construction industry.The prefabricated shear wall structure has developed rapidly in this situation,especially in high-rise buildings.Bolt connection is a new type of connection in the prefabricated shear wall structure.It connects the upper and lower prefabricated elements as a whole through bolts and nuts.Compared with the traditional wet connection,the bolt connection has the advantages of convenient operation,less wet work,and reliable connection quality.It has been widely used in engineering in recent years.This paper mainly analyzes the mechanical performance of bolted connections of assembled concrete shear wall,and uses the finite element software to discuss the overall mechanical behavior of the shear wall and the mechanical behavior of the bolt.The main research contents and conclusions are as follows:(1)Systematically summarized the connection forms of prefabricated shear wall structures in the current stage.Based on the existing research results and relevant standards,the main influencing factors of the load-carrying capacity of prefabricated shear walls were analyzed.(2)ANSYS software was used to establish the finite element model of the bolted connection of assembled concrete shear wall,The mechanical performance analysis was performed and compared with existing experiments to verify the rationality of the model.(3)Select different axial compression ratios,restraint edge member reinforcement ratio and bolt spacing for parameter analysis.When the axial compression ratio was 0.3-0.4,the change of the ductility coefficient of the component was the smoothest,the fluctuation coefficient of the bearing capacity degradation was smaller,and the overall performance of the component was better;the stress value at the bolt joint increased with the axial compression ratio.However,the stress value was less than the intensity value and the nodehad better safety.The placement of the bolts had little influence on the bearing capacity of the test piece.The maximum change rate of the limit displacement was 1.16%,and the maximum change rate of the limit load was 1.25%.The ultimate bearing capacity of the member increased with the increase of the restraining ratio of the edge member,but the ductility coefficient of the member showed an irregular trend.The maximum ductility factor of the member was the maximum at the axial compression ratio of 0.3 and the reinforcement ratio of 1.5%.(4)Referring to the current atlas of precast concrete shear walls,selected 300 mm as the modulus,changed the width of the shear wall components,and analyzed the mechanical behavior of the components under different aspect ratio conditions.The results showed that with the decrease of the aspect ratio,the ultimate bearing capacity of the shear wall member increased gradually,and the ductility coefficient gradually decreased.The ductility coefficient of the member increased fastest and the deformation ability was improved largely in the aspect ratio of 1.1-1.2.