Progressive Collapse Resistance Of Frame-supported Shear Wall Structure Considering The Effect Of Transition Layer

Since the collapse incident of Ronan Point apartment in 1968,the progressive collapse of the structures has received widespread attention in engineering field.At present,study on the structural progressive collapse is extensive and achieve abundant research results.However,on the other hand,the current structure to resist progressive collapse of the study is mainly confined to the typical reinforced concrete structure,so whether the related conclusion can be suitable for frame-supported shear wall structure remains to be further analysis.As a kind of common structural form of high-rise buildings,the resistance to progressive collapse of frame-supported shear wall structure is still a lack of reliable and practical analysis and evaluation methods,because the mechanical behavior of the conversion component is complicated and load transfer path is difficult to be continuous,through and complete.In order to investigate progressive collapse capacity of frame-supported shear wall structure which considering the effect of the conversion layer,a 22-storeys frame supported shear wall structure models are designed for the removal of component analysis based on software Midas-gen,which could research the resistance to collapse.The main research is summarized in detail as follows:(1)Frame-supported shear wall structure is established and nonlinear dynamic analysis is proposed with selecting the most unfavorable condition of failure removed component.According to the displacement time history curve,the internal force time history curve and the variation of the internal force of the adjacent components based on different failure conditions,the progressive collapse resisting force mechanism of frame shear wall structure is studied.(2)Based on the nonlinear static pushdown analysis method,the nonlinear static analysis of frame-supported shear wall structure is carried out.According to the load displacement curve,plastic hinge development sequence and structural internal force change,the ability to resist progressive collapse,the interaction between the upper and lower structure of the transition layer as well as the influence of the transfer layer is analyzed.(3)Through the progressive collapse resistance of the structure,the influence of the transfer layer on the progressive collapse resistance of the frame-supported shear wall structure is studied by comparing the equivalent lateral stiffness ratio between the upper and the lower layers of the transfer layer,and under different conversion layers.(4)On the basis of the existing progressive collapse design methods and the measures of resisting progressive,considering the particularity of the frame-supported shear wall structure,the measures of resisting progressive collapse are discussed.