Research On The Influence Of Concave-convex Irregular On The Seismic Performance Of Frame Supported Shear Wall Structure With Beam-type Transfer Layer

Nowadays,with the development of building science,buildings tend to be more complex in function and more diverse in appearance,which brings a new look to cities and brings new challenges to seismic design while satisfying people.Most of the buildings with different shapes and forms are planar or vertical irregular high-rise structures with transition floors,and the structure and forces of these structures are very complex.Therefore,we need to increase the research on such structures.Noting that most of the research on the conversion floor structures is placed on the location of the conversion floor and the equivalent lateral stiffness ratio above and below the conversion floor,In this paper,we focus our research on the degree of irregularity of the structural plan arrangement and investigate the effect of concave and convex irregularity on the seismic performance of beam-type frame-supported shear wall structures by changing the ratio of the concave dimension of the plan to the total dimension of the corresponding projection direction,i.e.,l/B_max.The research work is carried out mainly in the following aspects.（1）Three main models with l/B_max of 40.0%,50.0%and 57.1%and five l/B_max of 29.4%,35.0%,45.0%,53.6%,60.6%of the auxiliary models,carry out modal analysis,response spectrum analysis and elastic time history analysis of the structural model,study the seismic response and dynamic performance of the L-shaped beam frame-supported shear wall structure,and compare the structure under the calculation of the two software.Differences in indicators such as natural vibration period,floor displacement,inter-story displacement angle and floor shear force.（2）The results of the comparison between the elastic time method and the reaction spectrum method show that it is necessary to use the elastic time analysis method to supplement the calculation of the concave and convex irregular beam type box-supported shear wall,and the two analysis results have about the same trend,but the elastic time analysis can not only show the weak layer at the conversion layer but also find that the upper floors of the structure are also vulnerable to weak areas.（3）The seismic performance of the model at different l/B_max is compared,and the results show that:with the increase of l/B_max,the overall stiffness of the structure decreases sharply after a period of weak growth,and the torsional characteristics of the structure are significantly strengthened;the floor displacement and inter-story displacement angle of the structure show an increasing trend within the considered range,while the seismic shear force decreases,and the gap between the inter-story displacement angle of the transformed floor and the upper floor increases,so the increase of l/B_maxsignificantly reduces the lateral stiffness of the structure and intensifies the vertical irregularity of the structure.The increase of l/B_max will significantly reduce the lateral stiffness of the structure,intensify the vertical irregularity of the structure,and weaken the seismic performance of the structure.Meanwhile,the lateral stiffness of the structure is more sensitive at low l/B_max values,and a smaller increase in l/B_max causes a larger reduction in lateral stiffness.（4）The static elastic-plastic analysis of the L-shaped beam frame-supported shear wall structure is carried out,and the appearance sequence and mixed failure mechanism of plastic hinges are studied.The results show that under the action of a rare horizontal earthquake of 7 degrees,this kind of structure has good ductility,reflects the design concept of"strong columns and weak beams",and meets the earthquake resistance goal of"not collapsed in a big earthquake".With the increase of l/B_max,the number of plastic hinges first decreases and then increases,and the range shows that the two limbs are gradually lower than the corner to the two limbs are close to the corner,and finally evolve into two limbs are higher than the corners.It shows that the mutual influence degree of the two limbs of the L-shaped structure first increases and then decreases,the structural integrity first increases and then decreases,and the seismic performance of the structure first increases and then decreases.