研究目的:为探讨行波激励条件下铁路矮塔斜拉桥弹塑性地震响应的变化规律，基于弹塑性分析理论基 础,本文以某主跨（144 +288 + 144) m的铁路矮塔斜拉桥为工程背景，采用大刚度法实现多点激励以模拟行 波效应，对比分析一致激励和行波激励（考虑不同剪切波速)条件下铁路矮塔斜拉桥弹塑性地震响应的差异。
研究结论:（1)相比一致激励，行波效应会引起桥墩产生更大的弹塑性位移、弯矩响应及其非线性位移延 性比（延性指标）并使桥墩发生更大的塑性变形;（2)当剪切波速为200 mA时，行波效应使9#、10#主墩福州 与平潭侧薄壁墩身非线性位移延性比分别增大6. 32%、17. 90%、17. 67%和33. 92%，降低了其延性抗震能 力；（3)进行类似结构延性抗震设计时，应考虑地震行波效应的影响；（4)该研究成果可用于指导桥梁延性抗 震设计。

Research purposes ： In order to research the variation of elastic - plastic seismic response of railway low - pylon cable - stayed bridge under the excitation of traveling waves， based on the theoretical foundation of elastoplastic analysis and taking a railway low - pylon cable - stayed bridge with span arrangement 144 m + 288 m + 144 m as an engineering situation, the difference of elastic - plastic seismic response of bridge under uniform excitation and wave - passage excitation ( different shear velocity had been considered ) simulated by large stiffness method was analyzed.
Research conclusions:( 1 ) The responses of elastic - plastic displacement， moment and nonlinear ductility ratio of displacement of piers are increased as well as its plastic deformation, compared with the situation of uniform excitation. When shear velocity is 200ix^s，the nonlinear ductility ratio of displacement of Fuzhou and Pingtan s side of No. 9 pier and No. 10 pier have increased by 6. 32%，17. 90%，17.67% and 33.92%，which reduces the ductility seismic capacity of piers. (3) The effect of traveling wave should not be ignored when involving the ductility seismic design of similar structures. (4) The research results can be used in guiding for ductility seismic design of bridges.