Dynamic responses and damage forms analysis of underground large scale frame structures under oblique SV seismic waves

Abstract

This paper mainly focuses on distinctive dynamic responses of the underground large scale frame structure (ULSFS) under obliquely asynchronous seismic inputs of the near-fault ground motion. To achieve the arbitrarily oblique input of seismic waves, the ground motions are transformed into equivalent forces adding on the 3-D viscous-spring artificial boundary nodes based on the theory of wave propagation. The ULSFS with great scales along two horizontal directions are proposed according to a well-designed underground market under construction. The dynamic responses of the ULSFS under different oblique incident angles of seismic waves are compared. The failure mechanisms of the ULSFS are explored by the tensile damage of floor slabs and walls, and stresses and strains of frame columns. The results demonstrate that dynamic responses of the ULSFS with two horizontal great scales would be sensitive to oblique incident angles of the seismic input; and the ULSFS is more likely to be compression-shear failure under the combination of the asynchronous horizontal and vertical seismic waves.