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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (12): 2225-2233    DOI: 10.3785/j.issn.1008-973X.2021.12.001
土木工程、交通工程     
断层破裂过程对减隔震桥梁地震反应的影响
谢旭(),黄文彤,冀龙飞,王天佳
浙江大学 建筑工程学院, 浙江 杭州 310058
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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摘要：

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    
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.
Key words: stochastic Green’s function method    fault rupture process    directional effect    seismic isolation bridge    phase characteristics
收稿日期: 2021-01-05 出版日期: 2021-12-31
CLC:  U 448  
基金资助: 国家自然科学基金资助项目(51878606)
作者简介: 谢旭（1963—），男，教授，博士，从事桥梁抗震方面的研究. orcid.org/0000-0002-4247-0487. E-mail: xiexu@zju.edu.cn
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谢旭
黄文彤
冀龙飞
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引用本文:

谢旭,黄文彤,冀龙飞,王天佳. 断层破裂过程对减隔震桥梁地震反应的影响[J]. 浙江大学学报(工学版), 2021, 55(12): 2225-2233.

Xu XIE,Wen-tong HUANG,Long-fei JI,Tian-jia WANG. Influence of fault rupture process on seismic responses of seismic isolation bridges. Journal of ZheJiang University (Engineering Science), 2021, 55(12): 2225-2233.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.12.001    或    https://www.zjujournals.com/eng/CN/Y2021/V55/I12/2225

图 1  子断层破裂产生的地震动持时模型
图 2  子断层小震的相位差分谱以及累积概率密度
图 3  随机格林函数模拟地震动模拟过程
图 4  北岭地震的断层位置及台站位置
图 5  北岭地震中3个台站加速度时程和反应谱模拟结果与实际记录的对比验证
台站 实测/模拟 PGV/(cm·s?1) PGA/(cm·s?2) PGV/PGA/s
LV3 实测H1方向 8.43 82.53 0.10
LV3 实测H2方向 8.02 103.76 0.08
LV3 模拟 8.03 85.04 0.09
LV1 实测H1方向 7.81 87.14 0.09
LV1 实测H2方向 7.05 71.80 0.10
LV1 模拟 10.91 104.49 0.10
表 1  站台LV3、LV1的PGV/PGA
图 6  桥梁立面布置图
图 7  桥梁地震反应计算模型
图 8  观测点位置以及地震动加速度时程和反应谱模拟结果
图 9  P4墩顶位移地震反应及P5墩E型钢滞回曲线
图 10  调整后的El Centro地震动时程
${\rm{PGA} }$ $ 地震动 $ $|d^{{\rm{P4}}}_{{\rm{max}}}|$ $\eta ^{\rm{P5}}$
0.15g El Centro 27.6 3.5
0.15g 15-2 21.7 2.5
0.15g 30-4 24.0 2.8
0.30g El Centro 35.5 5.3
0.30g 15-3 26.2 3.8
0.30g 30-1 25.6 3.5
0.60g El Centro 40.3 8.5
0.60g 15-1 43.9 10.2
表 2  不同地震动输入下墩顶地震位移及E型钢阻尼器最大塑性率对比
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