This study investigates the effects of horizontal ground motion incident angle on a high-speed railway continuous bridge (HSRCB). To that end, incremental dynamic analyses (IDA), seismic vulnerability analyses and seismic risk assessments were conducted on a three-span HSRCB subjected to a set of ground motions under five incidence angles θ (0°–90°). The analysis was developed only from the perspective of PGA and the results showed that the longitudinal waves (θ = 0°) only caused seismic responses in the longitudinal direction, while the waves in other directions, especially in the transverse direction, caused a coupling response both in longitudinal and transverse directions for some components, such as the sliding layer and CA mortar layer. The longitudinal seismic damage of the sliding layer and CA mortar layer under the transverse waves should receive more attention in seismic design since the exceeding probabilities and seismic risk probabilities under various incident angles θ are as high as the calculated value for θ = 0°, and with a variation within 5.95%. The maximum variation of the longitudinal response and probability for track parts was within 10.59% under various incident angles, with a significant difference in the transverse response and probabilities in response to different incident angles. In addition, the responses of bridge structure components were more sensitive to the incident angles in comparison with the track parts. Finally, results indicate that the risk probabilities are at a maximum when the ground motions fall within horizontal orientations of 67.5°–90° at the bridge longitudinal axis.

本研究调查了水平地面运动入射角对高速铁路连续桥（HSRCB）的影响。为此，对三跨HSRCB进行了增量动力分析（IDA），地震易损性分析和地震风险评估，该HSRCB在五个入射角θ（0°–90°）下经受了一组地面运动。仅从PGA的角度进行了分析，结果表明纵波（θ θ= 0°）仅在纵向上引起地震响应，而其他方向（尤其是横向）上的波浪在某些方向（例如滑动层和CA砂浆层）的纵向和横向方向上引起耦合响应。下横波有关的滑动层和CA砂浆层的纵向地震损坏应该接收在抗震设计更多的关注，因为在各种入射角超过概率和地震风险概率θ一样高的计算值θ = 0°，偏差在5.95％之内。在各种入射角下，轨道部件的纵向响应和概率的最大变化在10.59％以内，横向响应和响应不同入射角的概率的显着差异。另外，与轨道部分相比，桥梁结构构件的响应对入射角更为敏感。最后，结果表明，当地震动在桥纵轴的水平方向上处于67.5°–90°的水平方向内时，风险概率最大。