西安建筑科技大学学报(自然科学版)

近断层脉冲型地震动是一类特殊的破坏性地震动,但此类地震动记录数量匮乏,难以满足近场工程结构抗震分析需求。本文首先从PEER强震数据库中选取典型近断层脉冲型地震动记录,形成近断层脉冲型地震动数据库。然后,将基于小波包变换的随机地震动模型与速度脉冲模型相结合,建立了一种考虑竖向分量的脉冲型地震动随机模型。在此基础上,利用非线性规划方法进行了模型参数识别,并选取走滑断层和逆断层地震动记录各一条,将实际地震动与模拟结果进行对比,验证了模型有效性。结果表明:本文模型可对近断层区域的水平向及竖向地震动进行有效模拟,文中给出的模型参数识别方法可在时域上和频域上均获得与目标地震动相匹配的结果。

Near-fault pulse-like ground motion is a special kind of destructive ground motion, but the number of suchground motion records is scarce, which makes it difficult to meet the needs of seismic analysis of engineering structures in near-fault areas. In this paper, typical pulse-like ground motions are selected from the PEER strong earthquake database to form the near-fault pulse-like ground motion database. On this basis, model parameters are identified by nonlinear programming method.A strike-slip fault and a reverse-fault ground motion record are selected respectively, and the actual ground motion is compared with the simulation results to verify the efficiency of the model.The results show this method can effectively simulate the horizontal and vertical seismic records in the near-fault area. The parameter identification method adopted in this paper can effectively match the target ground motion in time domain and frequency domain.

引言
1 近断层脉冲型地震动数据库构建
2 近断层地震动模型的建立
3 模型参数识别
4 结语

图1 脉冲型地震动记录与断层机制、Mw、Rrup和VS30的分布关系<br/>Fig.1 Distribution of pulse-like ground motions with respect to type-of-faulting, Mw、Rrup和VS30

图1 脉冲型地震动记录与断层机制、Mw、Rrup和VS30的分布关系
Fig.1 Distribution of pulse-like ground motions with respect to type-of-faulting, Mw、Rrup和VS30

表1 近断层脉冲型地震动数据库信息<br/>Tab.1 Information of near-fault pulse-like ground motion database

表1 近断层脉冲型地震动数据库信息
Tab.1 Information of near-fault pulse-like ground motion database

图2 小波包方法模拟地震动流程<br/>Fig.2 Procedures for simulating ground motions by wavelet packet method

图2 小波包方法模拟地震动流程
Fig.2 Procedures for simulating ground motions by wavelet packet method

表2 多分量脉冲型地震动模型参数αi,i=1,…,18<br/>Tab.2 Model parameters of multi-component pulse-like ground motion

表2 多分量脉冲型地震动模型参数αi,i=1,…,18
Tab.2 Model parameters of multi-component pulse-like ground motion

图3 脉冲型地震动NGA#1530低频速度时程提取<br/>Fig.3 Extraction of low-frequency velocity time series for NGA#1530

图3 脉冲型地震动NGA#1530低频速度时程提取
Fig.3 Extraction of low-frequency velocity time series for NGA#1530

图4 模型参数识别过程<br/>Fig.4 Process of model parameter identification

图4 模型参数识别过程
Fig.4 Process of model parameter identification

表3 目标地震动基本信息<br/>Tab.3 Information of target ground motion

表3 目标地震动基本信息
Tab.3 Information of target ground motion

图5 NGA#170原始记录与模拟地震动对比<br/>Fig.5 Comparison of observed and simulated ground motions for NGA#170

图5 NGA#170原始记录与模拟地震动对比
Fig.5 Comparison of observed and simulated ground motions for NGA#170

图6 NGA#1480原始记录与模拟地震动对比<br/>Fig.6 Comparison of observed and simulated ground motions for NGA#1480

图6 NGA#1480原始记录与模拟地震动对比
Fig.6 Comparison of observed and simulated ground motions for NGA#1480

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备注

引言

1 近断层脉冲型地震动数据库构建

2 近断层地震动模型的建立

3 模型参数识别

4 结语

期刊信息