多维地震激励作用下大跨度钢管混凝土提篮拱桥的随机响应

Stochastic response of a long-span x-type concrete filled-insteel tube arch bridge to multi-component seismic excitation

以某大跨度钢管混凝土提篮拱桥为例,分别研究了大跨度钢管混凝土提篮拱桥的自振特性及其在纵向激励、纵+竖向激励、纵+横向激励、纵+竖+横向激励作用下的地震响应特性。结果表明,横向激励对提篮拱桥地震响应特性有较大影响,对于多维激励情况,提篮拱桥的抗震性能并不优于平行拱,并进一步分析了原因。

Taking a long-span X-type concrete filled-in steel tube arch bridge as an example, the free vibration and response behavior of such bridge subjected to longitudinal excitation, longitudinal and vertical excitation, longitudinal and transverse excitation, three-dimensional excitation are studied. The calculation results show that transverse excitation seriously affects the internal force response of such bridge, and its seismic performance in the case of multi-component excitation is not better than that of parallel ribbon arch bridge, and the reason is analysed.