应用于天桥上部结构的张弦桁架设计分析

本文对应用于人行天桥上部承重结构的张弦桁架结构进行了设计计算分析,根据人行天桥结构承受的荷载远大于屋盖结构所承受的荷载的特点,并结合考虑天桥的具体施工方案,给出了张弦桁架结构拉索中初始张拉力值的确定原则和具体数值;数值模拟了作用于张弦桁架结构的风速时程,计算了天桥结构的风振响应,确定了结构的风振系数。

Analysis on Design of Truss-String Structure Applied in a Footbridge

The paper designs and analyses the truss-string structure used as major load-carrying members in the superstructure of one footbridge.Define the criterion and value of string's initial tensioning force in the truss-string structure,combined the characteristic that the load in footbridges is much larger than that in roof constructions and considering the specific construct process of the footbridge.This paper numerically simulates the time history of the wind speeds at the truss and calculates the wind vibra...