大跨径系杆拱桥动力特性参数分析

Analysis on dynamic characteristic parameter of large-span bowstring arch bridge

以格丑沟特大桥主桥为背景,通过变化拱肋内倾角和吊杆布置形式,应用有限元分析程序M IDAS进行了动力特性计算分析;计算结果表明:结构的横向基频随着内倾角的增大而增大,结构刚度也逐渐增大;但在三种吊杆布置形式下,结构横向基频无明显变化。

Taking main Gechougou Bridge as the background, through changing the internal leaning angle of arch rib and suspender layout forms, it calculates and analyzes the dynamic characteristics by applying finite element analysis program MIDAS. The calculation results show that： the transverse fundamental frequency of the structure will increase with the internal leaning angle increasing, structure rigid will gradually amplify, structural transverse fundamental frequency doesn＇ t has obvious change under three suspender layout forms.