[1]马海英,邱媛,夏烨,等.近断层区地震动的有限断层数值模型与分析[J].长安大学学报(自然科学版),2024,44(4):77-86.[doi:10.19721/j.cnki.1671-8879.2024.04.007]
　MA Hai-ying,QIU Yuan,XIA Ye,et al.Finite fault source model and analysis for ground motion near-fault zone[J].Journal of Chang’an University (Natural Science Edition),2024,44(4):77-86.[doi:10.19721/j.cnki.1671-8879.2024.04.007]
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近断层区地震动的有限断层数值模型与分析()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第44卷
期数:
2024年4期
页码:
77-86
栏目:
桥梁与隧道工程
出版日期:
2024-07-10

文章信息/Info

Title:
Finite fault source model and analysis for ground motion near-fault zone
文章编号:
1671-8879(2024)04-0077-10
作者:
马海英1; 邱媛1; 夏烨1; 赖明辉2
(1. 同济大学 土木工程学院,上海 200092; 2. 四川省公路规划勘察设计研究院有限公司,四川 成都 610041)
Author(s):
MA Hai-ying1;  QIU Yuan1;  XIA Ye1;  LAI Ming-hui2
(1. College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Sichuan Highway Planning,Survey, Design and Research Institute Ltd, Chengdu 610041, Sichuan, China)
关键词:
桥梁工程;  有限断层数值模型;  正演模拟;  地震动;  脉冲成分;  结构参数
Keywords:
bridge engineering;  finite fault numerical model;  forward modelling;  ground motion;  impulsive component;  structural parameter
分类号:
U442.55
DOI:
10.19721/j.cnki.1671-8879.2024.04.007
文献标志码:
A
摘要:
近场地震动含有脉冲成分,对桥梁的作用响应区别于远场地震动,其破坏更大,会导致桥梁出现坍塌等严重事故。为评估断层场地的近场地震效应,并为跨断层斜拉桥Benchmark模型平台提供近场地震动数据,基于琼山地震旧址的地质结构特征,建立有限有限断层数值模型,进行正演模拟,包括构建断层影响区域、确定断层破裂面的平均滑动、以及点震源地震动模拟。并利用数值模拟得到了观测点,比较数值分析结果与相近等级的记录地震动脉冲特性参数。分析了近断层区域的地震动,验证了有限断层震源数值模型的有效性。结果表明:断层破裂面视倾角越小,地面最大峰值加速度PGA、地面的峰值速度与峰值加速度之比PGV2A和Arias强度Ia越大,地震动脉冲性越强。垂直断层破裂面方向的地面峰值加速度PGAv、PGV2A在上盘或在传播方向的数值大于下盘,表现出了近断层地震的上盘效应和方向性效应; 而平行断层破裂面方向的地面峰值加速度PGAp、Ia和两水平方向的Arias强度之比Iy2x的分布规律恰好相反,其原因是横向地震动在下盘观测点的断层距更近,下盘上的效应大于上盘。模拟的Mw7.5的正断层地震动除PGA与1999年ChiChi地震CHY101(Mw7.62的斜滑断层)较为接近外,其余地震动脉冲特性参数和同类型的1980年Irpinia Sturno(Mw6.9的正断层)地震有较高的一致性。
Abstract:
For ground motion in near-fault zones includes, the impulsive component usually causes larger damage than that in far-fault ground motion, which results in bridge collapse. In order to assess the near-site seismic effect of the fault site and provide data for Benchmark modeling platform of cable-stayed bridges across faults, a numerical model using finite faults based on the geological and structural characteristics of the old earthquake site in Qiongshan was proposed with an orthotropic simulation, which includes fault impact zones construction, the determination of average slip on fault rupture surfaces and point-source ground vibration simulations. The observation points were obtained, and the analysis results with the impulsive characteristic parameters of the recorded ground of the similar grade were compared with the proposed model. And the ground shaking in the near-fault region was analyzed to verify the finite fault seismic model. The results show that the smaller the apparent dip angle of fault rupture plane has, the larger maximum peak ground acceleration PGA、 ratio of peak velocity to ground acceleration PGV2A and Arias strength Ia are induced, and the stronger the ground motion pulse is generated. The value of peak ground acceleration in the direction of the vertical fault rupture surface PGAv and PGV2A on the hanging wall or along the direction of propagation is larger than those on the footwall, which displays the hanging wall effect and directional effect of near-fault earthquakes, while the distribution law of peak ground acceleration in the direction of a parallel fault rupture surface PGAp,Ia and ratio of Arias strength in the two horizontal directions Iy2x is on the contrary, which is due to that the lateral ground motion is closer to the faults at the observation points of lower disk. PGA is close to CHY101(Mw7.62 oblique slip fault)in 1999 ChiChi Earthquake. In addition, the characteristic parameters of other ground motion pulse in the simulated ground motion of Mw7.5 normal fault have good agreement with 1980 Irpinia Sturno(Mw6.9 normal fault).3 tabs, 9 figs, 24 refs.

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备注/Memo

备注/Memo:
收稿日期:2023-12-20
基金项目:中央高校基本科研业务费专项资金项目(2023-2-YB-17); 国家重点研发计划项目(2018YFC0809606)
作者简介:马海英(1981-),女,山东青岛人,副教授,博士研究生导师,E-mail:mahaiying@tongji.edu.cn。
通讯作者:夏 烨(1983-),男,湖南永州人,副教授,博士研究生导师,E-mail:yxia@tongji.edu.cn。
更新日期/Last Update: 2024-07-10