悬索桥钢桁架加劲梁施工方法分析

Construction Methods Analysis of the Steel Truss Stiffening Girder of Suspension Bridge

以角笼坝大桥为实例,利用桥梁结构非线性仿真分析计算软件BNLAS,建立空间全桥模型,针对钢桁架加劲梁节段间四种连接方式进行分析计算,并对结果进行分析比较,从理论上得出施工中节段间仅在上弦设铰的连接方式最为合理,但对于跨度相对较小的悬索桥,考虑方便施工,可采用其它三种上下弦均连接的施工方式。同时,又对钢桁架加劲梁的吊装长度作了分析讨论,得出节段间在仅上弦设铰的连接方式下,吊装长度只能达到有限长度的结论。通过实测结果与计算结果的对比,验证了模拟分析计算结果的可信性。

In this paper, the joint modes of two segments of steel truss stiffening girder are studied as an important problem, taking Jiaolongba Bridge as an example. A space model of the whole bridge is established by means of the Bridge Nonlinear Analysis System. Four joint modes of two segments are considered in the space whole bridge models, and results are compared and analyzed. In theory, the joint mode in which two segments are jointed only on the upper is most reasonable. However, considering the convenient for construction, other joint modes may be adopted for a relatively short - span suspension bridge. At the same time, suspension length of steel truss stiffening girder is discussed in this paper. Suspension length is limited if two segments are jointed only on the upper. Finally, the creditability of simulative analytical results is validated through comparison with the real survey results.