Mechanical Behavior Of T-Shaped Multi-Partition Steel-Concrete Composite Shear Walls With Limited Width Under Axial Compression

Reinforced Concrete Shear Walls with Limited Width(RCSWLW)have been used widely in high-rise buildings,due to their special advantages,particurlar in terms of flexible arrangement,economic cost and easyness of adjusting stiffness center.In order to improve the bearing capacity and ductility of RCSWLW,a new type of Short-legged Shear Wall has been proposed by researchers,which is formed by the multi-partition hollow steel tubes filled with concrete and name d “Multi-partition Steel-concrete Composite Shear Walls with Limited Width(MSCSWLW)”.This innovative shear wall can take the full advantages of the characteristic behavior of steel and concrete,thereby offering enhanced bearing capacity and ductility.Moreover,the steel tube eliminates the need of formwork for concrete casting and leads to rapid construction.Until now,limited research efforts have been devoted to the behavior of MSCSWLW,which restrict the promotion of this innovative member in pratical engineering.Thus this thesis intends to provide a better understanding of the axially compressive behavior of T-shaped MSCSWLW.The main work is presented as follows:Three T-shaped MSCSWLW and Four T-shaped Multi-partition Steel-concrete Composite Columns were tested to failure under axial compressive loading.Based on the experimental results,the failure process,failure mode,and deformation characteristics were obtained.Stress state of the steel tubes for all the axially loaded specimens during the loading process were analyzed.The influences of the study parameters on the axial compressive behavior of test specimens were then investigated in terms of axial stiffness,bearing capacity,ductility coefficient and confinement between steel and concrete components.Comparisons of the superposition method,fiber model method and finite element method were carried out,and the finite element method was then applied to analyse the working mechanism of the axially loaded T-shaped MSCSWLW.The finite element model was built by ABAQUS and the appropriate concrete constitutive model was also determined for the finite element analysis.Such analysis method and the proposed model were benchmarked against the test results in this study.The stress distribution and interaction between the steel tubes and concrete were then investigated.Based on the proposed finite element model,extensive parametric studie s were then carried out to numerically investigate the influence on axial compression behavior of T-shaped MSCSWLW.Considered parameters included the height-to-thickness ratio of the cross-section,the compressive strength of concrete,the yield strength of steel and the width-to-thickness ratio of steel plate.The influence of the different parameters on the bearing capcity of T-shaped MSCSWLW were obtained.Based on the research results of exprimental program,numerical analysis and parameter analysis,simplified calculation formulas for the resistance of T-shaped MSCSWLW was recommeded.