预应力钢管混凝土组合桁架抗震性能的理论分析

Analysis of seismic performance of the prestressed concrete filled steel tubular combinatorial truss

为找出适合于大跨度输煤栈桥的结构形式;在考虑预应力钢管混凝土组合桁架优化设计及约束条件影响的基础上,建立了R-R型、C-C型和R-C型桁架模型,分析结构自振特性的特点,采用时程分析方法对地震作用进行研究。结果表明:部分弦杆填充混凝土R-C型预应力钢管混凝土组合桁架结构在抗震性能方面表现最为出色,更适合用于大跨度预应力栈桥结构。得出的结论,对工程结构尤其是大跨度空间结构的设计与分析具有一定参考价值。

In order to find out the suitable structure form of long-span coal transporting trestle, established R - R, C- C and R- C type truss model in consideration of the optimization design and constrained conditions of prestressed encased concrete circular steel-pipe truss. The self vibration characteristics of structure were analyzed, and the earthquake action was studied adopting the elastic time history analysis. The results show that the type of R - C prestressed encased concrete circular steel-pipe truss partially filled concrete is the most outstanding in terms of seismic performance, and it is more suitable for the large span prestressed coal transporting trestle. The conclusions drawn have certain reference value for the design and analysis of the engineering structure, especially for the large span spatial structure.