索形优化后的双向张弦梁索力静载试验设计与研究  

DESIGN AND RESEARCH ON STATIC LOAD TEST OF A BIDIRECTIONAL BEAM STRING STRUCTURE AFTER CABLE SHAPE OPTIMIZATION

作　　者：吴捷[1,2] 舒赣平[2] 

机构地区：[1]苏州大学金螳螂建筑学院,江苏苏州215000 [2]东南大学土木工程学院,江苏南京210096

出　　处：《工程力学》2015年第9期200-209,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51208094)

摘　　要：基于平衡荷载值确定双向张弦实腹梁结构的形状,设计了一个索形优化后的双向张弦梁整体结构索力静载试验。用万向节模拟撑杆与上弦钢梁节点,用特制花篮螺丝和改装的U型绳卡模拟拉索张拉端和锚固端,采用多点分配梁杠杆集中加载与跨中直接吊挂加载相结合的加载方案。试验结果显示,经过索网形状优化之后,竖向荷载增大到设计平衡荷载值时,双向各索索力值相近,分布均匀,明显改善受荷阶段结构中的索力分布。双向张弦梁下弦索对非对称活载尤其是二分之一跨分布形式较为敏感,可能出现边跨索力超过同级全跨荷载下的现象。Equilibrium load value determines the shape of a bidirectional beam string structure. Static load test of an experimental bidirectional beam string structure model after cable shape optimization is designed. The node of brace and the chord of upper steel beam are stimulated by the universal coupling. Wreaths screwdriver is used to stimulate the tensioning end and modified U type rode cappel is used to stimulate the anchor end. A loading scheme combining lever concentrated loading by multi-point distributive beam and center loading is adopted. The experimental results show that the forces of each cable in two directions are almost equal and evenly distributed when the vertical load value increases to the equilibrium load value after cable shape optimization. The cable force distribution will be adjusted during the loading stage. The cable of bidirectional beam sting structure is susceptible to the asymmetrical live loads, especially to the half span load. Compared with the whole span uniform load, a half span uniform load probably lead to greater forces in the side span cables of the bidirectional beam string structure.

关 键 词：预应力钢结构 索力特性 试验研究 索形优化 双向张弦梁 对称荷载 非对称荷载 

分 类 号：TU394[建筑科学—结构工程]