Study On Performance-based Design Method And Seismic Performance Of Composite Coupled Wall Structures In High Seismic Intensity Areas

With the advancement of urbanization of China,construction of high-rise buildings has been increasing substantially in high seismic intensity areas.In some regions where the seismic precautionary intensity reaches 9,the traditional reinforced concrete shear wall structural system is found unsuitable for high-rise buildings due to the difficulty of meeting design codes and restrictions on the building function as well as the bad economic benefit.Composite coupled shear wall structures,consisted of steel coupling beams and steel plate-concrete composite wall piers,can form the dual lateral force resisting mechanism and ensure the safety of high-rise buildings under strong earthquake.Considering its construction convenience and comprehensive economic benefits,the the composite coupled shear wall structures system is a good choice for the seismic design of high-rise buildings in high seismic intensity area.Hence,it’s important to study the design method and seismic behavior of composite coupled shear wall structures.In this paper,the plastic design method based on energy balance for composite coupled shear wall structures was deduced referring to the design method proposed by Leelataviwat and Goel and relative internal force adjustment measures.12 composite coupled shear wall structure cases located in the 9 intensity area were designed by the plastic design method.Pushover and dynamic time history analyses were conducted in ABAQUS to study the seismic behavior of these cases.Structural drift ratios,development of wall pier internal force and coupling beam shear force were discussed mainly.Based on the research work of this paper,the main conclusions were as follows.(1)The plastic lateral force distribution pattern in the plastic design method is controlled by the structural type coefficient?_s.The?_s value of 0.75 is verified to be rational.(2)Due to the axial force disparity between the compression and tension wall caused by the coupling effect,the internal forces distribute unevenly in the two wall piers of composite coupled shear wall structures.In this paper,proportions of wall pier bottom moment corresponding to different CR has been proposed and verified.(3)The shear force demands distribution of coupling beams based on the structural story shear distribution coefficient and an the amplification coefficient 1.1 were verified to be rational.But the shear force demand of bottom coupling beam is suggested to be reduced.(4)Comparing the dynamic bottom shear force amplification effect obtained from analysis to the design adjustment measures,the combination of the correction coefficient proposed by Paulay and the elastic design concept was proved to be efficient to ensure the strong shear and weak bending characteristic of composite coupled shear wall structures.(5)By discussing seismic performance of the composite coupled shear wall structures,the CR values of 30%-40%are suggested for composite coupled shear wall structures not higher than 12 stories,the CR values of 50%-60%are suggested for 16-20 stories structures in 9 seismic intensity areas.