Seismic Performance Analysis Of Frame-Supported Short-Leg Shear Wall With Different Height Of Transfer Layers

The frame-supported short-leg shear wall transfer structure is widely used because of its flexible arrangement of wall limbs and full lateral load resistance.The Zhong Shusheng team of Chongqing University has carried out a series of experiments and finite element analysis on the node,substructure and frame of this type of transformation,and has achieved certain results.In this paper,the large finite element analysis software SAP2000 is used to analyze the seismic analysis of the whole building model of the frame-supported short-leg shear wall with the axillary beam type transfer structure and the inclined column type transfer structure.At the same time,the influence of the different height of transfer layers on the two types of transfer structure is considered,and the research results of the team are enriched.Meanwhile,the seismic response of this kind of structure is also obtained.The contents of this article is as follows.(1)The transfer layer located on the second layer of frame-supported short-leg shear wall structure with haunch transfer beam and inclined column are analyzed by vibration mode decomposition reaction spectrum method.According to the structural vibration period,story shear,story displacement,interstory displacement angle and stiffness ratio are compared,the study shows that the contribution of the inclined column to the stiffness of the transfer layer is better than the contribution of the haunch.Then the internal force analysis of the transfer beam and transfer floor slab is carried out,and the stress characteristics of the two transfer structures are further explored.(2)The transfer layer located on the second to forth layers of frame-supported short-leg shear wall structure with haunch transfer beam and inclined column are analyzed by vibration mode decomposition reaction spectrum method,considering two cases of the constant layer height and the total height invariance.From the comparison of structure vibration period,story shear,story displacement,interstory displacement angle,stiffness ratio and other aspects,it can be found that the stiffness of the structure will decrease under the case of the constant layer height and the stiffness will increase under the case of the total height invariance.At the same time,it is also found that the next layer of the transfer layer and the transfer layer may be the weak layer.(3)The time history analysis of the frame-supported short-leg shear wall structure with haunch transfer beam and the inclined column transfer under the second to forth layers are carried out under the action of multiple earthquakes and rare earthquakes in the case of the constant layer height.The above conclusions are further verified from the bottom shear,the story displacement and the interlayer displacement angle.At the same time,through plastic hinge,it can be found that under the rare earthquake,the transfer structure has a reasonable yielding mechanism.Based on the above analysis,it can be found that the increase of transfer layer will make the next layer of transfer layer and transfer story easier to become a weak layer.The inclined column has great contribution to the stiffness of transfer layer,but it may cause the next layer of transfer layer to be weaker.Therefore,in the seismic design of this type of transfer structure,the stiffness design of the transition layer and its next layer should be fully considered to avoid the emergence of the weak layer.