常州体育馆索承单层网壳屋盖低摩阻可滑动铸钢索夹试验研究

Experimental research on low friction slippery cable clips in the cable-supported dome of Changzhou Gymnasium

以常州体育会展中心体育馆钢屋盖为工程背景,研究了采用环索张拉方法时,大跨度椭球形索承单层网壳铸钢索夹节点处的预应力损失及其承载能力。选取该结构中最外环环索转角最大处的铸钢索夹,对其同步进行了摩擦损失和承载能力研究的足尺模型试验。试验结果表明,采用四氟乙烯板加不锈钢垫层的措施可有效降低铸钢索夹节点处的摩擦损失,能够保证主动张拉环索索段和被动张拉环索索段之间索力的有效传递;在整个预应力施加过程中,铸钢索夹均处于弹性工作状态。因此,对大跨度椭球形索承单层网壳结构,采用科学张拉方法及低摩阻可滑动铸钢索夹可实现结构预应力的有效建立。

Taking the steel roof of the gymnasium of Changzhou Sports and Exhibition Center as the engineering background,the loss of prestress and carrying capacity of the cast-steel cable clips were researched when tensioning loop cables were applied on a long-span ellipsoidal cable supported dome.The cast-steel cable clip at the maximum curvature point of the outermost loop cable was selected,and a fullscale model test of the friction loss and carrying capacity was carried out simultaneously.The results indicate that using teflon plate and stainless steel cushion in the cast-steel cable clip can effectively reduce friction loss,which guarantees cable forces of active and passive cable segment,and the cast-steel cable clip is in elastic state under tensioning.The conclusion is that with reasonable design of low friction,slippery cable clips,tensioning loop cables can effectively establish the prestess in a long-span ellipsoidal cable supported dome.