中文摘要：

为研究大跨度斜拉桥地震反应特性及行波效应对其影响,以某大跨度斜拉桥为例,依据D′Alembert基本原理,采用动态时程法计算结构动力位移和内力。选用2条不同频谱特性地震波,考虑不同视波速对大跨度斜拉桥地震反应的影响,重点研究行波效应对大跨度斜拉桥的地震反应影响,并与一致激励地震反应结果进行比较。结果表明：随着视波速的增大,各桥塔塔底内力、塔顶位移以及墩底内力的地震响应值有显著变化且趋近于一致激励地震响应;行波效应对主梁顺桥向轴力和塔顺桥向剪力有显著影响;在地震波加速度峰值（0.40g）相同的情况下,由于各条波之间频谱特性的不同,不同视波速输入下结构的地震反应存在一定的差异。

英文摘要：

To study the seismic response characteristics and the influence of traveling wave effect on the seismic response of long-span cable-stayed bridge,a cable-stayed bridge of the same kind was cited as an example and in accordance with the fundamental principle of D′Alembert,the dynamic time-history method was used to calculate the dynamic displacement and internal forces of the structure.Two seismic waves with different spectrum characteristics were selected and in consideration of the influence of different apparent wave velocity on the seismic response of the long span cable-stayed bridge,the influence of the traveling wave effect on the seismic response of the bridge was particularly studied and was compared to the results of the seismic response of uniform excitation.The results of the study indicate that with the increase of the apparent wave velocity,the seismic response values of the internal forces of the pylon footings,the displacement of the pylon tops and the internal forces of the pier footings have significant changes and the values tend to approach the seismic response of uniform excitation.The traveling effect has significant influence on the axial force of the main girder and on the shear force of a pylon in the longitudinal direction of the bridge.In the case of the same acceleration peak value（0.40g） of the seismic wave,when the different apparent wave velocity are inputted,the seismic response of the structure has differences owing to the different frequency spectrum characteristics of the various waves.