Experimental study and finite-element analysis of shear wall with CFST, column-form reinforcement, and diagonal bars

A new type of composite shear wall with concrete-filled steel tubular frames, column-form reinforcement, and diagonal bars (CFST-CFR-DBSW) was proposed to develop high-efficiency lateral force resistance components for high-rise buildings. In order to study the seismic performance of the new shear wall, four specimens were designed: the new shear wall (CFST-CFR-DBSW), a shear wall with column-form reinforcement and diagonal bars (CFR-DBSW), an ordinary reinforced concrete shear wall (RCSW), and an ordinary reinforced concrete shear wall with concrete-filled steel tubular frames (CFST-RCSW). These specimens were constructed, and then tested under low-cycle loading. Using the experimental results, the anti-seismic behavior indexes of the four specimens were analyzed, including failure mode, bearing capacity, ductility, energy dissipation, stiffness degradation, and damage. A finite-element model of the new shear wall was established with ABAQUS to investigate the influence of the thickness of the steel tube, concrete strength, diameter of the column-reinforcement, and diameter of the diagonal bars on the seismic performance of the shear wall specimen. The research results showed that, compared with other specimens, CFST-CFR-DBSW was significantly strengthened with respect to bearing capacity, deformation, energy dissipation, stiffness, and damage. In addition, the results calculated by the ABAQUS finite-element model was in good agreement with the experimental results, and the influence rules of relevant parameters on the seismic performance of CFST-CFR-DBSW were obtained.