SEISMIC ANALYSIS OF SEMIBASEMENT STRUCTURES IN LONGITUDINAL DIRECTION USING STEEL PIPE PILES AS MAIN WALLS

Abstract

The seismic response characteristics of semibasement structures using steel pipe piles as main walls are studied under L2 level strong seismic motions in longitudinal direction. First, the influence of ground conditions and width of structures to the response behaviors are examined based on seismic deformation method. We find that the longitudinal seismic inputs produce larger responses than those of transverse seismic inputs, the possibility to produce the damage in the main structure is small if expansion joints are used every 20m, and the deformations of steel pipe joints are slightly big because of the concentrated deformations are produced in the expansion joints. In addition, it is showed that the seismic deformation method has enough precision in practical use from the comparison with 2-D and 3-D FEM analyses.