Seismic response sensitivity of a V-shaped canyon-crossing bridge considering the near-source canyon topographic effects
Seismic response sensitivity of a V-shaped canyon-crossing bridge considering the near-source canyon topographic effects
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考虑近震源峡谷地形效应的V型峡谷桥地震响应灵敏度
DOI：
10.1016/j.soildyn.2022.107205
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发表时间：
2022-04
影响因子：
4
通讯作者：
Gao Yufeng
中科院分区：
文献类型：
--
作者：
Li Shuai;Zhang Fan;Wang Mingdong;Cheng Zhao;Zhang Yu;Zhang Ning;Wang Jingquan;Gao Yufeng
过去的地震事件表明，由于峡谷地形的影响，跨越峡谷的桥梁更加脆弱。震源-峡谷距离、峡谷深-半宽比、地震动入射角、横波速度等影响桥梁地震反应的因素较多。本研究用数值方法考察了这些因素对一座典型的v型峡谷桥梁地震反应的影响，这些因素在现有文献中没有得到充分的研究。为了反映峡谷地形效应，利用v形峡谷引起的地震波散射和衍射模型综合了各桥墩位置的地面运动。分析模型在描述源位置影响方面的准确性得到了验证。对桥梁抗震设计中主要影响因素的重要性进行了详细的参数分析。结果表明，入射角和深半宽比对桥梁响应有显著影响。当入射角大于45°时，在桥梁抗震设计中应考虑地形放大效应对桥梁反应的影响。震源位置和土体性质对桥墩的地震反应有一定的影响。深峡谷引起的桥梁响应比浅峡谷高得多。当深半宽比大于0.4时，地形的不规则性会对峡谷一侧的桥墩响应产生明显的放大。地震发生后，轴承在当地地形引起的不等振幅和不等相位的地震波作用下经历了明显的残余变形。
Past seismic events have shown that the canyon-crossing bridges are more vulnerable due to the canyon topographic effects. The seismic responses of such bridges are affected by various influential factors, including source-to-canyon distance, depth-to-half-width ratio of the canyon, incident angle of the ground motion, and shear wave velocity. This study numerically examines the impacts of these factors on the seismic responses of a typical bridge across a V-shaped canyon, which are not adequately investigated in the existing literature. To represent the canyon topographic effects, the ground motions at each bridge pier location are synthesized by the scattering and diffraction models of seismic waves induced by the V-shaped canyon. The accuracy of the analytical model in describing the effect of the source location has been validated. A detailed parametric analysis is conducted to evaluate the importance of the main influential factors in the seismic design of the bridge. The results demonstrated that the incident angle and depth-to-half-width ratio result in significant effects on the bridge responses. When the incident angle is larger than 45°, the topographic amplification effect on the bridge responses should be considered in the seismic design of the bridge. The source location and soil property show certain influences on the seismic responses of the piers. The deep canyon can cause much higher bridge responses than the shallow canyon. When the depth-to-half-width ratio is larger than 0.4, the topographic irregularities can cause noticeable amplifications on the pier responses at the illuminated canyon side. After the earthquake events, the bearings experience noticeable residual deformations under the seismic waves with unequal amplitudes and phases induced by the local topography.
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影响因子：
2.8
作者：
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影响因子：
4.8
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--
影响因子：
3.7
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典型曲线桥的振动台测试：波浪通过和局部场地效应
影响因子：
3.6
作者：
Zhang, De-Yi;Yan, Wei-Ming;Chen, Yan-Jiang;Xie, Wei-Chau
通讯作者：
Xie, Wei-Chau