ABSTRACT

A cable-stayed bridge full model was tested to study the travelling wave effects on the transverse acceleration frequency spectra, seismic responses, and pile-soil interactions under transverse non-uniform excitations. The results indicate that the non-uniform excitations affect the transverse acceleration frequency spectra of the girder. The non-uniform excitations increase the displacement at 3/4-span of the girder but decrease the displacements at 1/2- and 1/4-span of the girder. The pile-soil interaction effects of one tower increase, whereas those of another tower decrease due to the non-uniform excitations. The numerical model could generally capture the seismic response changes caused by the non-uniform excitations.

摘要

对斜拉桥全模型进行了测试，以研究横向非均匀激励下行波对横向加速度频谱、地震响应和桩土相互作用的影响。结果表明，非均匀激励影响了梁的横向加速度频谱。非均匀激励增加了梁的 3/4 跨度处的位移，但减小了梁的 1/2 和 1/4 跨度处的位移。由于非均匀激励，一个塔的桩土相互作用效应增加，而另一塔的桩土相互作用效应降低。数值模型一般可以捕捉到由非均匀激励引起的地震响应变化。