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| Influence of fault rupture process on seismic responses of seismic isolation bridges |
Xu XIE( ),Wen-tong HUANG,Long-fei JI,Tian-jia WANG |
| College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China |
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Abstract An improved stochastic Green’s function method that using phase characteristics to simulate the directivity effect was proposed, in order to research the influence of the fault rupture process on the seismic response of seismic isolation bridges. Taking the fault conditions of the 1994 Northridge earthquake in the United States as an example, the effectiveness of the simulation method was verified by comparison with the actual seismic records. The improved stochastic Green's function method was used to simulate four groups of acceleration time histories with the same epicentral distance as the input conditions, and the effects of fault rupture process on the seismic response of seismic isolation bridges with the same epicentral distance and different directions were compared. Results show that the similarity between the duration envelope curve and the phase difference distribution can be used to simulate the acceleration time history of stochastic Green’s function conveniently. Under the same epicentral distance, the ground motion at the observation point in the fault rupture direction and the seismic response of the bridge structure at the corresponding position are significantly greater than those at the observation point in the non rupture direction. When the acceleration time history of ground motion in the rupture direction does not have pulse characteristics, the seismic response of seismic isolation bridges around the fault is mainly affected by the intensity of ground motion, and the influence of bridge orientation is not obvious.
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Received: 05 January 2021
Published: 31 December 2021
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| Fund: 国家自然科学基金资助项目(51878606) |
断层破裂过程对减隔震桥梁地震反应的影响
为了研究断层破裂过程对减隔震桥梁地震反应的影响，提出利用相位特性模拟方向性效应的改进随机格林函数法. 以1994年美国北岭地震的断层条件为例，通过与实际地震记录对比验证模拟方法的有效性；应用改进的随机格林函数法模拟相同震中距离的4组地震动时程作为输入条件，比较断层破裂过程对相同震中距离、不同方位的减隔震桥梁地震反应影响. 结果表明，利用持时包络曲线与相位差分分布的相似性可以方便模拟随机格林函数的地震动加速度时程；在相同震中距离条件下，断层破裂方向的观测点地震动以及对应位置的桥梁结构地震反应明显大于非破裂方向位置的观测点；当破裂方向上地震动时程不具有脉冲特性时，断层周围的减隔震桥梁地震反应主要受地震动强度的影响，桥梁方位的影响不明显.
关键词：
随机格林函数法,
断层破裂过程,
方向性效应,
减隔震桥梁,
相位特性
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