EFFECTS OF SOIL-STRUCTURE INTERACTION ON SEISMIC RESPONSE OF PC CABLE-STAYED BRIDGE

This paper attempts to assess the effects of dynamic soil-structure in teraction (SSI) on the seismic behavior of a PC cable-stayed bridge pl aced on a moderately deep soil stratum overlying rigid bedrock, and to evaluate the applicability of a simple mass-spring model in evaluatin g SSI. Parametric analysis is performed to investigate the significanc e of SSI under various stiffness, foundation depth conditions using fi nite element methods. The applicability of a mass-spring model is disc ussed by comparison with FEM. The results of analysis reveal the influ ence of SSI on the seismic behavior of bridge-soil system, and recomme ndations for aseismic design are provided. The mass-spring model prove s to be promising for representing the seismic behavior of the bridge- soil system, and the mechanism is interpreted in detail.