空间缆索悬索桥主缆扭转的模型试验  

Model test of main cable torsion of spatial cable suspension bridge

作　　者：齐东春[1] 汪洪星[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《铁道建筑》2016年第2期14-17,共4页Railway Engineering

基　　金：湖北省自然科学基金(2014CFB331);国家自然科学基金资助项目(51178396)

摘　　要：由钢丝集束体组成的主缆,其扭转刚度是受多因素影响的变量,目前空间主缆的扭转没有可靠的计算方法。通过江东大桥空间主缆扭转的模型试验,探讨了体系转换中主缆扭转角的量值及变化规律。试验结果表明：体系转换前期扭转刚度小、主缆横向位移大,主缆扭转角增加迅速,后期趋于稳定;各索夹呈现出下缘向远离桥轴线方向的横向偏转,成桥状态下主缆扭转角实测值在16°～28°。可在临时吊索张拉期间通过现场测试获得主缆扭转刚度随主缆轴力及扭转角的变化规律,在临时吊索全部张拉后再安装吊索索夹。Cable in suspension bridge is composed of a bundle of steel wires,and its torsion stiffness is affected by many factors. No reliable calculation method is available at present. Through model test of main cable torsion in Jiangdong Bridge,the value and variation of the cable torsion angle during the system transform were obtained. The test results show that the cable has a small torsion stiffness and large transverse displacem ent during the initial stage of system transform. The cable torsion angle increases rapidly,then tends to be stable. The lateral deflection of the lower edge of cable clips is deviated from the bridge axis. At the completion of the bridge,the measured torsion angle of the cable is 16 degrees to 28 degrees. The variation of the torsion stiffness with cable axial force and torsion angle can be obtained by the field test during the temporary cable tension. The installation of cable clips can be carried out after the tension of all temporary cable.

关 键 词：悬索桥 空间主缆 模型试验 主缆扭转 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]