大跨度简支系杆拱桥抗震设计

Aseismic Design of Large-Span Simply Supported Tied Arch Bridge

系杆拱桥在跨航道领域应用广泛,抗震设计通常控制下部结构。以1座150 m下承式简支系杆拱桥为例,就抗震设计的几个关键性问题进行梳理和分析,包括抗震性能目标的确定、抗震体系的选择、剪断力的选取、减震位移的控制及抗震措施的设计。最后对未涉及问题进行补充。这些可供大跨度拱桥抗震设计时参考。

Tied arch bridge is widely used in the field of crossing navigation channels,and the aseismic design usually controls the substructure.Taking a 150 m through simply supported tied arch bridge as an example,this paper analyzes several key problems in seismic design,including determination of seismic performance objectives,selection of seismic system,selection of shear force,control of seismic displacement&design of seismic measures.In the end,the problems not involved are supplemented.It can be used for references in seismic design of large-span arch bridges.