索形优化后的双向张弦梁静载试验分析之非对称荷载下的上弦钢梁

Static load test analysis of the upper steel beam of a bidirectional beam string structure after cable shape optimization for an asymmetrical load

基于平衡荷载值确定双向张弦实腹梁结构的形状,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,设计了一个索形优化后的双向张弦梁整体结构静载试验。与全跨均布对称荷载下的受力性能明显不同的是,非对称荷载试验结果显示,边跨和各榀端部至四分之一跨区间受荷载影响最大。二分之一长跨、二分之一短跨及四分之一跨荷载分布形式都可能带来双向张弦梁结构局部内力超过全跨均布荷载的后果。可见,双向张弦梁是一类对非对称荷载分布较为敏感的结构体系。

The shape of a bidirectional beam string structure was determined for balanced loads. The static load tests＇ used lever-concentrated loadings through distributive girders on multiple spots and direct banging of the loading at the center of the structure plane. Unlike results using whole span uniform loads, the asymmetrical load tests showed that the side span and every end up to the quarter span was most affected by the load. Compared to the whole span uniform load, the half long span, half short span and quarter span uniform loads led to higher internal forces on parts of the beams in the bidirectional beam string structure. Thus, bidirectional beam string structures are sensitive to asymmetric load distributions.