Experimental Study And Theoretical Analysis On Seismic Performance Of Embedded Steel Plate Composite Shear Wall With Concrete Filled Steel Tubular Columns

Concrete filled steel tube (CFST) has been used more often in high-rise buildings,at the same time the steel plate shear wall is also being applied with rapiddevelopment in recent years. The rational combination of CFST and steel plate shearwall is important for improving the anti-seismic performance of high-rise buildings.The embedded steel plate composite shear wall with CFST columns has beendeveloped in the thesis. And experimental study, theoretical analysis, numericalsimulation and design method about it were conducted. The main contributions are asfollows:1．An embedded steel plate shear wall with profile steel reinforced concretecolumns has been proposed. The low cyclic loading tests of5composite wallspecimens and1normal RC shear wall specimen have been carried out. The columnstyle, thickness of plate, connections and axial force ratio were considered. The loadbearing capacity, stiffness degradation, ductility, hysteretic behavior, energydissipation capacity and failure characteristics have been analyzed. The effect ofprofile steel reinforced concrete boundary columns and the embedded steel plate onimproving the entire seismic behavior of the shear wall has been revealed.2．A new embedded steel plate composite shear wall with CFST columns hasbeen proposed. The low cyclic loading tests of9specimens have been carried out.The column style, thickness of plate, shear span ratio, connections and axial forceratio were considered. The load bearing capacity, stiffness degradation, ductility,hysteretic behavior, energy dissipation capacity and failure characteristics have beenanalyzed. Compare with the embedded steel plate shear wall with profile steelreinforced concrete columns, the embedded steel plate composite shear wall withCFST columns shows better seismic behavior.3．A new shear connecting technique between the internal steel plate and theexternal concrete has been proposed and studied. It is demonstrated that the integratedseismic performance between steel plate and concrete is good by low cyclic loadingtests of specimens with the technique.4．The load bearing capacity calculated model and the restoring force model ofthe embedded steel plate composite shear wall with CFST columns and the embeddedsteel plate shear wall with profiled steel reinforced concrete columns have beenestablished. Simulation of several typical specimens has been conducted by the finite element analysis software ABAQUS. The computed results agree well with the testresults. According to the theoretical calculation and analysis, the failure mechanism ofthe new composite shear wall is made.5．Suggestions about design and construction measures of the new wall,including the general rules, scope of application and the principles of construction aregiven.According to results of the research, main contributions are as follows:1． Comparing with the normal RC shear wall,the embedded steel plate shearwall with profiled steel reinforced concrete columns and the embedded steel platecomposite shear wall with CFST columns shows excellent seismic behavior withhigher load bearing capacity, larger initial stiffness. Constrained by the strongerboundary CFST columns, the embedded steel plate composite shear wall with CFSTcolumns has better ductility and better energy dissipation capacity.2． Owing to the steel plate embedded in the wall, the occurrence of inclinedcracks on surface of concrete wall is delayed, and their development is alsoconstrained. Thus the late rigidity of the shear wall is well held. At the same time, thefailure mechanism of the wall is also improved.3． In the case of rational plate opening rate and the same reinforcement rate,the wall equipped with new connectors between the embedded steel plate and outerconcrete has nearly the same working performance, the better capacity of deformationand energy dissipation than using steel studs.