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| 近断层地震动场预测——以长春市为例 | |
| 引用本文： | 盛俭,薄景山,佴磊,邹春红.近断层地震动场预测——以长春市为例[J].地震工程与工程振动,2012,32(2):48-53. |
| 作者姓名： | 盛俭 薄景山 佴磊 邹春红 |
| 作者单位： | 1. 中国地震局工程力学研究所,黑龙江哈尔滨150080;吉林省地震局,吉林长春130117 2. 防灾科技学院,河北燕郊,101601 3. 吉林大学建设工程学院,吉林长春,130026 4. 吉林省地震局,吉林长春,130117 |
| 基金项目： | 国家发展计划委员会"十五"重点项目 |
| 摘 要： | 断层带附近地震动场分布的研究,是当前地震工程领域研究的热点问题之一。近断层地震动场的分布对在断层附近进行抗震结构设计时,不仅是提供地震动输入,也是确定建设场地避让范围的重要依据之一。以区域地震构造背景分析、目标断层活动性鉴定、地震危险性评价为基础,结合断层探测结果,利用统计经验关系等最终确定发震断层,并建立相应的震源模型。采用显式有限元和并行计算技术计算目标区域场地的长周期地震动。利用有限断层随机合成的方法,计算高频地震动。将低频和高频地震动合成为目标区域内的宽频带地震动时程。对局部特殊场地条件地区,基于场地调查和勘探的数据,利用等效线性化等方法进行一维土层的非线性反应计算,给出这些特殊场地的宽频带地震动时程。最后,根据地震动时程获得设定地震发生时,目标区域的峰值加速度分布预测图和相应的反应谱。以长春市为例预测了在设定地震发生时,近断层地震动场的分布情况。当长春尖山子—卡伦断层发生6.0级地震时,潜在破坏性地震动的影响范围集中在附近,沿断层走向分布。加速度峰值沿断层垂直变化,主要为90 Gal～140 Gal。只是在长春市南部加速度峰值达到200 Gal。本研究的预测结果具备断层附近地震动的一些最基本的特征,符合当前对断层附近地震动的基本认识。 |
| 关 键 词： | 近断层 地震动 有限元 加速度 预测 |
Forecast for near-fault ground motion field:Taking Changchun City as an example |
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| SHENG Jian , BO Jingshan , NAI Lei , ZOU Chunhong.Forecast for near-fault ground motion field:Taking Changchun City as an example[J].Earthquake Engineering and Engineering Vibration,2012,32(2):48-53. | |
| Authors: | SHENG Jian BO Jingshan NAI Lei ZOU Chunhong |
| Institution: | 1.Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;2.Earthquake Administration of Jilin Province,Changchun 130117,China;3.Institute of Disaster Prevention Science and Technology,Yanjiao 101601,China;4.College of Construction Engineering,Jilin University,Changchun 130026,China) |
| Abstract: | The study of near fault ground motion field distribution is one of hot points in earthquake engineering.Near-fault ground motion field distribution not only provides an input motion but also provides the range of avoiding belt of the foundation in seismic design.Based on regional geological structure,activity assessment of aimed fault and assessment of seismic hazard,using experience statistical relationship to determine seismogenic faults,the corresponding source model was set up.Combining 3-D finite element analysis and parallel computing,the long period ground motions were calculated.The method of limited-fault random synthesis was used to calculate the high frequency ground motion.The high-frequency and low-frequency ground motions were composed to broad-frequency ground motion.1-D equivalent linearization method was used to calculate the broad-frequency ground motion time histories of some special local sites according to survey data.The PGA distribution and the corresponding response spectra of the target region are got according to the ground motion time histories when the design earthquake occurs.As an example,the near-fault ground motion distribution of Changchun City was predicted when a setting earthquake occurred.When an Ms6.0 earthquake occurs on the Jianshanzi-Kalun fault,the influence range of potentially destructive ground motion is near the fault,and the distribution of influence range is along the fault.The peak acceleration varies along the fault vertically mainly from 90 Gal to 140 Gal and the peak acceleration reaches 200 Gal only in the southern part of Changchun City.The forecasting result has the basic characteristics of near-fault ground motion,and matches the current basic understanding of the ground motion near the fault. |
| Keywords: | near fault ground motion finite element peak acceleration forecasting |
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