温度对悬索桥锚跨索股张拉的影响分析

为研究温度对边跨索力、锚跨索股张拉值的影响，以及由于两者差值而引起的对散索鞍处索股抗滑性的影响，从两种方法着手进行研究：一是建立温度变化值和索力变化值之间的关系式；二是通过编写程序直接计算。以珠江黄埔大桥为例，计算结果表明，两种方法的计算结果基本接近；散索鞍固定时，温度对边跨索力的影响比值在-1 kN/℃左右，而对锚跨的影响比值达-6、-7 kN/℃，当温度变化达8.2℃时，146号索股边跨、锚跨的索力差将超过散索鞍提供的最大摩擦力；散索鞍自由时，温度变化对锚跨索股张拉力的影响则小得多。因而，当散索鞍固定时，需要根据实际温度对锚跨张拉力进行修正，必要时还需在散索鞍处采取一定的防滑措施。

Influence Analysis of Temperature on Strands Tensioning in Anchor-Span Suspension Bridge

For the purpose of studying the temperature influence on strands tensioning in anchor-span suspension bridge, and each force in side-span, two methods are proposed: the one is based on the relational expression between temperature change and strands force variation; and the other is based on calculation program. Then, take Zhujiang Huangpu Bridge for example. The result shows that: the results of two methods approximate to each other; when the saddles are fixed, as soon as the strands temperature rise 1℃, the tensions go down by 1kN in side-span, by contrast with the reduction of 6 or 7 kN in anchor span; but when the saddles are free, the influence coefficient is much smaller. So if the saddles are fixed, and in case that the temperature changes exceed its suitable range, the strand force difference between side-span and anchor span will go beyond the maximal friction, as a result, measures should be taken to avoid strands sliding.