Seismic Performance Analysis Of Frame Supported Shear Wall Structure With High Beam Transfer

With the rapid growth of the urban population,more and more tall buildings with a transfer structure have been develeping in the city in order to increase the utilization rate of urban land,improve the urban appearance,and meet the multi-function of the building.At home and abroad,the beam transfer structure is the most widely used form in the high-rise building structures with the transfer structure.The research on seismic performance of beam transfer structure has been mature,and some provisions on beam transfer structure have been imposed by the current specifications.However,the practical application of the slab transfer strcture adopted to realize the upper and lower structure types and cylinder net conversion is less,and the research on the seismic performance of slab transfer strcture is still not enough in-depth.With the continuous development of the high-rise building structure,the slab transfer strcture will be more applied to the actual project.In this paper,we choose the frame-supported shear wall with slab transfer layer as the research object,mainly from the following aspects:(1)The numerical simulation model was established by using Satwe and Midas-gen software,and the dynamic characteristics,response spectrum and time history of the structure were analyzed.The dynamic performance and seismic response of the slab-switch structure were studied including the differences between the two types of software in terms of natural vibration period,floor displacement,floor drift angle and floor shear.(2)By changing the thickness of the shear wall,the effect of the equivalent lateral stiffness ratio of the upper and lower structure on the natural vibration period,the displacement angle,the distribution of shear force and the transmission path of the floor is studied.The results show that with the increase of the thickness of the shear wall,the equivalent lateral stiffness ratio of the upper and lower structures and the overall stiffness of the structure gradually increase,but the natural vibration period,floor displacement and interlayer displacement angle decrease.(3)The influences of the position and thickness of the transfer plate on the displacement angle,the distribution of floor shear force and the way of transmitting force are studied.The results show that the change of the position of transfer plate has different effects on the two directions of the lower and upper structure of the transfer layer,and results in a sudden change of the shear distribution of the upper structure floor of the transfer layer.With the increase of the thickness of the transfer plate,the influence on the lateral stiffness and earthquake shear force is less.The displacement angle between the lower structural layers of the transfer floor increases and the floor shear wall receives more seismic force.(4)The push-over analysis of frame-supported shear-wall structures with slab transfer layer is carried out to understand the order of appearance of plastic hinges,the mixing failure mechanism and the location of weak layers in structural beams,columns and shear walls.The results show that the structure has good ductility under the action of rare earthquakes of seven degrees,meeting the seismic performance target of No Collapsing in the Strong Earthquak.