Seismic Performance Analysis Of Concrete-filled Square Steel Composite Frame-RC Shear Wall Structure In High Intensity Seismic Region

Concrete-filled Square steel tube structure is a kind of new young composite structure.it give full play to the excellent characteristics of steel and concrete materials,and its building layout is flexible,the form of node is simple,moment inertia of section is large,stable performance is good,construction is convenient.In recent years,it was widely populated and attended by engineering,applied in practical engineering are also increasing.However,in view of concrete-filled square steel tube structure at home and abroad research,it mainly focused on beam-column joints,local components,pseudo static experimental study of several layers and several span frame structure etc.and for the study in the seismic performance of concrete-filled square steel tubular column,steel beam and RC shear wall composed of Concrete-filled Square steel tube combination framework-RC shear wall structure is not much,especially overall seismic performance of the structure system in the high intensity area is rarely reported.In order to promote the construction and application of concrete-filled square steel tubular frame structure,this paper applies the new research theory and method in the light of the requirements of high seismic fortification in Kunming area,in view of seismic performance of CFRT in the high intensity area do research of the following several aspects:(1)By using finite element software to build structure model,and carries on the dynamic characteristics analysis,attain frequency of structure,cycle and vibration mode,and to explore different thickness of shear wall,different thickness of floor,and different height of bottom and column section size influence on the dynamic characteristics of the whole structure and rule of the change.At the same time,comparing with equivalent ordinary frame-shear wall structure,in dynamic characteristics and small earthquake response spectrum method comparison.CFRT structure on the dynamic characteristics,deformation characteristics and internal force characteristics is better than that of ordinary frame-shear wall structure.(2)According to the specification to select appropriate seismic wave,the concrete-filled square steel tubular frame-RC shear wall structure do analysis under frequent earthquakes elastic time history,analysis structure internal force and deformation of different seismic excitation and comparing with ordinary frame-shear wall structure,getting the inter-layer displacement angle,layer shear force and displacemen CFRT structure under severe earthquake t are less than ordinary frame-shear wall structure,and concludes that much of this kind of structure under severe earthquake seismic performance is superior to the ordinary frame-shear wall structure.(3)Dynamic elastic-plastic time history analysis for CFRT structure by using SAP2000 software is carried out to analyze seismic behaviors of rare earthquakes,and structure internal force,displacement response and other indicators are obtained.Compared with the common frame-shear wall structure,the results showed that the ultimate deformation capacity,bearing capacity,yield strength,and hysteretic energy dissipation of CFRT structure are relatively high,which can satisfy the requirement of "No collapsing with strong earthquake"under rare earthquake,seismic performance under rare earthquake is superior to the ordinary frame-shear wall structure.(4)Finally,the paper summarizes the research achievements of this project,gives some suggestions on its application in the engineering design,and also puts forward problems of the subject and the further development direction.