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Title:: Seismic Wave Propagation Effect on Seismic Response of Long-span Bridges with High Piers Across River Valleys

作者:: 郭昆霖¹; 李小军¹; 2; 吴敬武³; 孙平宽³; 李邦武⁴; (1.中国地震局物理研究所，北京 100081；2.北京工业大学城市与工程安全减灾教育部重点实验室，北京 100124；3.中国公路工程咨询集团有限公司，北京 100089；4.海南交通工程建设局，海南海口 570208)

Author(s):: GUO Kunlin¹; LI Xiaojun¹; 2; WU Jingwu³; SUN Pingkuan³; LI Bangwu⁴; (1.Institute of Geophysics，China Earthquake Administration，Beijing 100081，China)(2.Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology，Beijing 100124，China)(3.China Highway Engineering Consultants Corporation，Beijing 100089，China)(4.Hainan Transportation Engineering Construction Bureau，Haikou 570208，Hainan，China)

关键词:: 河谷地形; 大跨高墩桥梁; 地震波入射角; 地震动时差; 地震反应

Keywords:: valley topography; long-span and high pier bridge; incident angle of seismic wave; time delay of ground motions; seismic response

分类号:: U442.5+5

DOI:: -

摘要:: 地震波行波效应会导致跨河谷高墩大跨桥梁各墩底基础处地震动到时产生差异，使桥梁结构地震反应变得更为复杂。通过构建高墩大跨桥梁结构模型，考虑墩高对称与非对称两种结构模型和不同频谱特性的地震动输入，采用大质量法开展了桥梁结构反应数值模拟，探讨了地震波斜入射的行波效应导致的桥梁各桥墩处输入地震动的时差对桥梁结构反应的影响。计算分析表明:①各桥墩处输入地震动的差异导致对称结构桥梁的反应出现极为不对称性，也加大了非对称结构桥梁的反应的复杂性；②桥梁结构反应内力改变且影响程度空间分布极为不均匀，高墩中间跨及高墩墩底受到影响较大；③随着地震波入射角度的加大，桥梁结构反应的改变程度总体呈增大趋势；④地震波入射角度对桥梁结构反应的影响特征与输入地震动的频谱特性密切相关。

Abstract:: The seismic wave propagation effect leads to the difference of ground motion intensity and arrival time at the base of each pier，which makes the response of this kind of bridge structure more complicated.The structure models of high pier and long span concrete continuous rigid frame bridges were constructed，and considering the structure models of pier height symmetry and asymmetry and input seismic waves with different frequency properties，the numerical simulation of structural responses of bridges was carried out by means of large mass method，and the effect of the time delay of ground motions caused by the incline incidence of seismic waves at pier foundation sites of the bridge on the structural responses of bridges was discussed.The analysis results show that:①the wave propagation effect due to leads to the extreme asymmetry of the responses of the symmetrical structure bridge，and increases the complexity of the responses of the asymmetric structure bridge；②The internal force change of the structural responses of bridges and very uneven spatial distribution of the impact，The middle span between the high piers，and the middle piers in the pier responses of bridges are greatly affected；③With the increase of incident angle of seismic wave，in general，the change degree of structural responses of bridges tends to relatively large；④The characteristics of the effect of traveling wave on the response of bridge structure are closely related to the spectral characteristics of the input ground motion.

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

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