索鞍无预偏施工悬索桥主缆的温度效应

Temperature effect on suspension bridge with non-pre-bias of cable-saddle

针对索鞍无预偏施工悬索桥的几何形状对温度变化非常敏感等特点,研究了主缆架设过程中存在的温度效应问题。建立了主缆架设中索股、主缆横断面和纵断面的温度模型,根据无应力索索长恒定不变的原理求解温度作用下主缆中、边跨垂度,得出了垂度计算公式,给出了有关主缆索股调整的具体方法。结果表明,该温度模型和计算公式是准确调整索股垂度的一种较简便可行的方法,为索鞍无预偏施工悬索桥的设计与施工提供了一定的理论依据。

The geometry of the suspension bridge built by the non-pre-bias of cable-saddle is very sensitive to the temperature in the process of the main cable＇s erection. The temperature models of the cable, the main cable＇s cross-section and vertical section are developed during the main cable erection. According to the cable length constant and changelessness principle of unstressed cable, the main cable sags of mid-span and side-span are calculated under temperature action, the calculation formulas of the sags are given, the method of main cable adjustment is put forword. The result shows that the temperature model and the calculation formulas are feasible and accurate to make an cable sags adjustment. They can offer the theory basis for the design and construction of the suspension bridge built by the non-pre-bias of cable-saddle. 1 tab, 4 figs, 11 refs.