Experimental seismic behavior of double skin composite wall with steel truss

This paper describes an experimental study to investigate the seismic behavior of double skin composite walls (DSCWs) with steel truss. Based on the results of seven specimens tested at full-scale, the influence of aspect ratio, axial compression ratio, and truss spacing to thickness ratio on the seismic behavior of DSCW with steel truss are considered. The failure mode, load-displacement relationship, strength, ductility, stiffness, energy dissipation capacity, and shear deformation were analyzed. The results showed that the aspect ratio had the most significant influence on the failure mode and seismic behavior of the specimen. For specimens with an aspect ratio of 2.0, shear compression failure dominates, while for specimens with an aspect ratio over 2.0, flexure shear failure dominates. The strength and initial stiffness decreased with the increase of aspect ratio, but the ductility and energy dissipation became better with the increase of aspect ratio. The axial compression had a little positive effect on the strength, but the specimen with a smaller axial compression ratio had better ductility and energy dissipation. The large truss spacing to thickness ratio weakened the external restraint effect of the steel truss on the steel plates, leading to premature buckling and failure of the specimen.