Investigation On Seismic Performance Of Frame-supported Shear Wall Structures With High Transfer Story

Under the situation of the diversified development of modern high-rise buildings,the large space frame-supported shear wall structure with a transfer story at the bottom has been widely studied and applied in actual structural engineering.At present,the structural design code stipulates that the transfer story of frame-supported shear wall structure should not exceed 5floors in the 7-degree seismic fortification intensity zone,and the transfer story in the 8-degree seismic fortification intensity zone should not exceed 3 floors.However,in recent years,the position of the transfer story in many frame-supported shear wall structures’ actual structural engineering has become higher and higher,which has significantly exceeded the position of the transfer story specified in the code.Therefore,it is of great significance to systematically study the seismic performance of frame-supported shear wall structures with high-level transfer story.This article preliminarily evaluates the seismic performance of the frame-supported shear wall structure with high-level transfer story from the overall and component levels.The main works are as follows: First,6 high-level transfers are designed in the 7-degree seismic fortification intensity zone,and the 8-degree seismic fortification intensity zone.The position of the transfer story of the 7-degree zone model is set on the 5th,7th,and 9th floors respectively,and 9th floors,and the position of the transfer story of the 8-degree zone model is set on the3 rd,5th,and 7th floors.Each model has been tested under the action of frequently occurred earthquake.In the three-dimensional structural elasto-plastic analysis software PERFORM-3D,the elasto-plastic time history analysis under the input of multiple ground motion records of rare level is performed on each model,and the seismic performance evaluation based on the overall deformation and component deformation is adopted to evaluated the seismic performance of the structure and components.Finally,the elasto-plastic time history analysis under the action of the four maximum seismic accelerations of 8-degree 0.4g,0.8g,1.2g and1.6g was carried out on the model with the 7th transfer story in the 8-degree zone.The seismic performance evaluation based on the overall deformation and component deformation reveals the failure mechanism and collapse mechanism of the structure.The main conclusions of the research are as follows:(1)From the perspective of the overall seismic performance of the structure,the 7-degree zone and the 8-degree zone model have similar laws.The structure has good overall seismic performance in the elastoplastic stage,and it meets the seismic fortification requirements of "not falling in large earthquakes".(2)From the perspective of the seismic performance of structural components,the 7-degree zone and the 8-degree zone model have similar laws.Under the action of rare earthquakes,the frame column,frame-supported beams,and shear walls still have sufficient safety reserves.The connecting beams and frame beams form a good yield mechanism,which conforms to the concept of seismic design.(3)From the perspective of the failure mechanism of the frame-supported shear wall structure with the 7th transfer story in the 8 degree zone,the plastic development of the components of the frame-supported story of the structure always lags behind that of the upper part of the transfer story,indicating that the structure has achieved frame-support The goal of not taking the lead in failure of the first story.The failure sequence of each component is energyconsuming components such as connecting beams and frame beams,the upper shear wall of the transfer story,and the lower shear wall of the transfer story,indicating that the structure has multiple seismic lines of defense.(4)From the perspective of the collapse mechanism of the frame-supported shear wall structure on the 7th transfer floor in the 8 degree zone,when the maximum seismic acceleration of the structure is 0.8g,it is in a collapsed state according to the elastic-plastic allowable interstorey drift index,but the collapse caused by dynamic instability does not occur when the maximum seismic acceleration is 1.6g.According to the result of component deformation,when the maximum seismic acceleration is 0.8g,The collapse of the structure is due to the failure of the shear wall on the transfer story.