Seismic behaviors of steel truss-embedded steel-concrete composite shear walls

Abstract

This study firstly proposed a novel type of steel truss-embedded steel-concrete composite shear wall (STSCW) for super-tall buildings. The embedded steel truss in this shear wall provides lateral resistance even after concrete crushing, delays concrete failure, and serves as an effective connection to the external truss beam in mega-frame structures. Four cyclic loading tests were conducted on the proposed STSCWs to investigate their seismic behaviors. In this experimental program, the investigated parameters included the axial force ratio and the steel-concrete interface with/without studs. The results of the cyclic loading tests demonstrated that all the STSCWs failed in flexure, and exhibited the characteristics of local buckling of faceplates, vertical fracture of the welds at corners, tensile fracture of the steel side plates, concrete crushing, chord necking, or buckling of the embedded steel truss. The axial force ratio was found to significantly affect the energy dissipation and deformation capacities of the STSCWs. In addition, the deformation of embedded steel truss worked well with the steel-concrete-steel sandwich wall (SCSSW) before the yielding point. Welding the studs on the flange surface of the embedded steel truss improved the deformation compatibility between the embedded steel truss and SCSSW wall. Moreover, the embedded steel truss failed in flexure via chord member buckling or necking.