重庆西站组合桁架拱结构设计与安全性分析

Structural Design and Safety Analysis for Composite Truss Arch of Chong Qing West Railway Station

重庆西站站房正立面结合建筑造型采用大跨度组合桁架拱结构体系。桁架拱结构体系传力高效,但结构的稳定性是保证结构设计安全性的关键问题。文章以重庆西站为例,通过拱结构在大跨度空间结构中的设计应用,综合性的对桁架拱结构进行静力分析、稳定性分析和弹塑性极限承载力分析。研究结果发现,重庆西站正立面桁架考虑几何非线性和材料非线性后的极限荷载因子为3.29,证明了重庆西站桁架拱结构具有足够的安全余度,该研究结果可为类似大跨度桁架拱结构的安全性设计提供参考。

In combination with architectural style,the large-span composite truss arch structural system is adopted in the front elevation of Chongqing West Railway Station building. Truss arch structures are efficient in the transmission of force,however,the stability of the structure is the key issue to ensure the structural designing safety. Taking Chongqing West Railway Station as an example and through the application of arch structure in the design of large-span spatial structure,this article carries on synthetically the static analysis,stability analysis and elastic-plastic ultimate bearing capacity analysis of the truss arch structure. The researching results proved that the ultimate load factor is 3. 29 of front elevation of Chongqing West Railway Station after considering geometric nonlinearity and material nonlinearity,which demonstrated that the truss-arch structure of Chongqing West Railway Station has adequate safety redundancy. Thus,the researching results would provide reference for the safety design of the similar large-span truss arch structures.