Author(s)

A Che & T Iwatate

Abstract

In order to clarify the dynamic behaviors and damage mechanism of subway structures due to the 1995 Hyogoken-nanbu earthquake, scaled model shaking tests and its simulation analyses were performed. The dynamic responses, dynamic forces (shear earth pressures, lateral earth pressures) acting on the structure and bending strains induced in the center columns were verified due to horizontal and vertical input motions, individually and simultaneously. In case of horizontal input motions, dynamic horizontal forces acting on the structure, and bending strains induced in the center columns were very larger than those in case of vertical input motions. The dynamic responses of the structure and dynamic earth pressures due to simultaneous horizontal and vertical input motions were approximately equal to those by horizontal input motions. The experimental results were verified by simulation analyses using SHAKE (one- dimensional analysis) and TDAP (two-dimensional analysis) programs. From these results, the subway structure collapsed due to strong dynamic horizontal forces mainly acting on the structure.

Keywords