单塔斜拉人行桥的环境温度效应研究

Investigation on Environmental Thermal Effects of a Single Tower Cable-stayed Footbridge

基于有限元理论建立了单塔斜拉人行桥的分析模型,并对其进行了动力特性分析。采用太阳辐射理论建立了斜拉人行桥结构的温度荷载模型和温致效应分析方法。在此基础上以某单塔斜拉人行桥为工程背景,进行了结构的温致效应分析计算,研究了斜拉人行桥不同位置的温致效应差异。结果表明:斜拉人行桥的温致效应较为显著,虽然不足以导致结构发生损伤和破坏,但与其它荷载的耦合作用将降低结构的承载力储备。

The model of the cable-stayed footbridge was firstly constructed based on the finite element theory and the dynamic properties were computed. The thermal loadings and analytical methods were developed based on solar radiation theory. Then, a real single tower cable stayed footbridge was taken as an example to analyze the thermal effects and in- vestigate the temperature variation at different places. The made observations indicate that the thermal effects of the sin- gle tower cable stayed footbridge are relatively obvious. Although the thermal effects may not induce the damage and de- struction of the bridge, the combination of thermal loads and other service loads may reduce the force bearing capacity of the bridge.