For the same bridge structure,its effects under earthquake action are mainly influenced by four factors of basic seismic peak acceleration,characteristic period,site type,and seismic importance coefficient.Select a 30 m span simply supported small box girder pile column lower structure and use the single variable method to compare and analyze the influence of different factors on the seismic effect,and compare it with the static calculation results.The results indicate that the lower structure is often controlled by the design seismic effect,and static verification alone cannot guarantee structural safety.The basic seismic peak acceleration and site category have a significant impact on the seismic effect.
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