不同震源机制的近断层脉冲型地震动频谱特性及强度指标研究
发布时间：2018-12-11 03:27
【摘要】：将不同场地类别和震源机制上的118条近断层地震记录进行分类,基于基础隔震结构的双自由度体系简化模型,利用状态空间法及四阶龙格-库塔法对结构的弹塑性反应谱进行求解,研究了场地类别和震源机制对反应谱频谱特性的影响。通过分析近断层地震记录的3个强度指标与基础隔震结构最大弹塑性响应的相关性,探讨了基础隔震结构地震反应分析时强度指标的选取问题。结果表明,三种场地类别条件中,速度反应谱规律不明显,但逆断层地震动的平均加速度反应谱和逆斜断层地震动的平均位移反应谱均最大。场地类别和震源机制不同,地震动强度指标与结构响应的相关程度不同。因此在进行近断层脉冲型地震动作用下基础隔震结构地震反应分析时,建议考虑结构所在场地及地震动的震源机制后采用不同地震动强度指标来选择和调整地震动输入。
[Abstract]:118 near-fault seismic records of different site types and focal mechanisms are classified, and the simplified model of two-degree-of-freedom system for base-isolated structures is presented. The state space method and the fourth order Runge-Kutta method are used to solve the elastoplastic response spectrum of the structure. The effects of site type and focal mechanism on the spectral characteristics of the response spectrum are studied. Based on the analysis of the correlation between the three strength indexes of near-fault seismic records and the maximum elastic-plastic response of base-isolated structures, the selection of strength indexes in seismic response analysis of base-isolated structures is discussed. The results show that the law of velocity response spectrum is not obvious, but the average acceleration response spectrum and the average displacement response spectrum of inverse fault ground earthquake are the largest. The correlation between seismic intensity index and structural response is different with different site types and focal mechanisms. Therefore, in the seismic response analysis of base-isolated structures under the action of near-fault impulse ground motion, it is suggested to select and adjust the seismic input after considering the location of the structure and the focal mechanism of the ground motion.
【作者单位】： 兰州理工大学防震减灾研究所;兰州理工大学西部土木工程防灾减灾教育部工程研究中心;
【基金】：教育部长江学者创新团队项目(IRT13068) 国家自然科学基金(51578274)
【分类号】：TU352.1
本文编号：2371780
[Abstract]:118 near-fault seismic records of different site types and focal mechanisms are classified, and the simplified model of two-degree-of-freedom system for base-isolated structures is presented. The state space method and the fourth order Runge-Kutta method are used to solve the elastoplastic response spectrum of the structure. The effects of site type and focal mechanism on the spectral characteristics of the response spectrum are studied. Based on the analysis of the correlation between the three strength indexes of near-fault seismic records and the maximum elastic-plastic response of base-isolated structures, the selection of strength indexes in seismic response analysis of base-isolated structures is discussed. The results show that the law of velocity response spectrum is not obvious, but the average acceleration response spectrum and the average displacement response spectrum of inverse fault ground earthquake are the largest. The correlation between seismic intensity index and structural response is different with different site types and focal mechanisms. Therefore, in the seismic response analysis of base-isolated structures under the action of near-fault impulse ground motion, it is suggested to select and adjust the seismic input after considering the location of the structure and the focal mechanism of the ground motion.
【作者单位】： 兰州理工大学防震减灾研究所;兰州理工大学西部土木工程防灾减灾教育部工程研究中心;
【基金】：教育部长江学者创新团队项目(IRT13068) 国家自然科学基金(51578274)
【分类号】：TU352.1
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