SEISMIC ANALYSIS ON EXTRA-DOSED CABLE-STAYED BRIDGE WITH CORRUGATED STEEL WEB PC COMBINED BOX GIRDER

摘要

Although the impact of changing of bridge pier' stiffness for girder inner force of corrugated steel web PC combined box girder extra-dosed cable-stayed bridge is little. But the seismic response characteristics of the bridge is different. For the aims of finding the seismic response characteristics of the bridge. Firstly, used the software of Midas to analyse two kinds of corrugated steel web PC combined box girder extra-dosed cable-stayed bridge, in which, the one's pier is rigid and the other is flexible as the forms of pier are hollow and double thin-wall pier to study the force changes on the pier and girder of the bridge. Secondly, through analysing the double thin pier wall corrugated steel web PC combined box girder extra-dosed cable-stayed bridge as the tower height changed from 31. 4 m to 44 m under the force of earthquake, we can find it is remarkable that the impact on the bridge pier, girder and tower as the system of bridge changed from extradosed cable-stayed bridge to cable-stayed bridge. Finally, compared with the results of analysis, can we confirm the most appropriate structure system parameters for the bridge. The study of the paper provide reference for bridge engineers in China when they design the corrugated steel web PC combined box girder extra-dosed cable-stayed bridge in the earthquake area.