Abstract

This paper discussed about seismic retrofit design method for existing pile-supported reinforced concrete frame pier designed in the pre-1980 design code. The effect of the interaction between pile and soil was examined thought non-linear dynamic response analysis. From the comparison between static and dynamic analysis, it is found that the piles demanded the lateral resistance and residual displacement against earthquake loading by considering inelastic effect, as have been evidenced in the highway bridges in recent strong earthquake. For some situations as retrofitting of existing bridge, an appropriate inclusion by considering soil-structure interaction effects may bring large design cost saving.

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