四索面双塔联体分幅斜拉桥塔结构模型试验研究  

Model Test for the Pylon of the Joint-Pylon Cable-Stayed Bridge with Four Planes of Cables and Twin Separate Girders

作　　者：刘兆丰[1] 赵人达[1] 戴显荣 杨永清[1] 王晓阳 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]浙江省交通规划设计研究院,浙江杭州310006

出　　处：《中国铁道科学》2009年第6期12-18,共7页China Railway Science

基　　金：浙江省交通科技项目(2007C10088)

摘　　要：为确保联塔分幅斜拉桥中塔结构的安全可靠,以宁波甬江特大桥为工程背景,进行整体桥塔3∶40缩尺模型的2种斜拉索分级加载试验,以研究联塔结构的力学行为。在满足目标状态要求的前提下,以斜拉索数量最少为原则,确定试验中斜拉索的优化布置及相应的优化索力。试验测得的结构变形、控制断面应力和斜拉索的索力与计算值吻合较好。试验结果表明:斜拉索数量最少优化方法在达到预期目标的同时提高了斜拉索的利用率;在2种工况加载过程中,未出现结构开裂情况,结构的变形和受力安全、合理,结构整体受力性能良好,但联塔部位混凝土出现局部拉应力,为相对薄弱部位。In order to assure the safety and reliability of the joint-pylon of the cable-stayed bridge with separate twin girders and united twin-pylons, a test for the whole joint-pylon was made with a scale-down model of 3 ： 40 by taking Ningbo Yongjiang super-large bridge as an example. Two unfavorable conditions were simulated by step loading in the test to study the mechanical behavior of the joint-pylon. On the premise of meeting the target state, assignment positions and corresponding cable forces were optimally determined according to the principle of minimal number of the stayed cables. The displacement of the structure, stress of control sections and the cable forces tested agreed well with the calculated values. Test results show that the cable force optimization method for the minimal number of the stayed cables has reached the expected target and increased the utilization rate of the stayed cables. In the loading process of two conditions, the structure does not crack, the deformation and stress of the structure is safe and reasonable, the whole resistant behavior is well, but the local tensile stress exists in the joint part, which is relatively weak.

关 键 词：斜拉桥 联塔结构 相似理论 索力优化 模型试验 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]