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Parameter influencing analysis on dynamic characteristic of extradosed PC bridge

Fang Zhen-zheng

Abstract

A finite element benchmark model of extradosed PC bridge with two towers is built in this paper to analyze its dynamic characteristic.Dynamic characteristic analysis is done by changing system's parameters from bearing condition,ratio of height to span of girder,ratio of side to median spans and height and rigid of towers.The influence degree of system's parameters to dynamic characteristic of extradosed PC bridge is studied.The calculated results show that the influence on dynamic characteristic would be obvious by changing structural parameters.Therefore it would be regarded to decide structural parameters when designing extradosed PC bridges,in order to fulfill the demand of aseismic design.

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Key concepts: Structural engineering, Bridge (graph theory), Engineering, Span (engineering), Tower, Structural system, Finite element method, Benchmark (surveying)