非平稳地震激励下结构随机响应及动力可靠性研究

吴昊; 张洵安

doi:10.13204/j.gyjz201212009

非平稳地震激励下结构随机响应及动力可靠性研究

doi: 10.13204/j.gyjz201212009

吴昊,
张洵安

1.
西北工业大学力学与土木建筑学院,西安 710072

基金项目:

国家自然科学基金项目(51078311);教育部博士点基金项目(20096102110018);西北工业大学基础研究基金项目(JC200814)

详细信息

作者简介:
吴昊，男，1984 年出生，博士研究生。E-mail:wuhao@mail.nwpu.edu.cn

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- 被引次数: 0
出版历程
- 收稿日期: 2012-08-02
- 刊出日期: 2012-12-20

THE RANDOM RESPONSE AND DYNAMIC RELIABILITY ANALYSIS OF STRUCTURE SUBJECTED TO NON-STATIONARY SEISMIC EXCITATION

1.
School of Mechanics and Civil Engineering &Architecture,Northwestern Polytechnical University,Xi'an 710072,China

摘要

摘要: 基于美国西部121条基岩强震加速度记录,采用Hilbert-Huang变换(HHT)生成能真实反映地震记录频率和强度双非平稳特性的非均匀调制演变功率谱,并用经验统计方法建立了根据地震矩震级、震源距预测演变谱的统计模型。运用虚拟激励法得到具有特定震级、震源距的演变功率谱作用下结构的非平稳随机响应特性,同时结合首次超越理论,分析了结构的动力可靠度问题,并且与仅具有强度非平稳特性的均匀调制地震随机激励作用进行比较,结果表明,在总能量相同的情况下,双非平稳功率谱的激励会使结构的响应更大,结构更容易失效。
- Hilbert-Huang变换 /
- 演变功率谱 /
- 非平稳随机响应 /
- 动力可靠度
Abstract: The evolutionary power spectrum reflecting the earthquake energy contribution characteristics on time-frequency plane was estimated by the Hilbert-Huang Transform(HHT),and with reference to the experiential statistical method,an evolutionary spectrum prediction model for given earthquake magnitude and distance was established based on the 121 near-source acceleration records at rock surface with large magnitude from the ground motion database of western U S.The pseudo excitation method was adopted to acquire the solution for linear structural random response under specific non-stationary seismic excitation and structural dynamic reliability was discussed based on the first-excursion failure criterion.The results demonstrated that the non-stationary contents included in seismic excitation would increase greatly the random response and failure probability of structure in comparison with strength non-strationary excitation.
- Hilbert-Huang Transform /
- evolutionary power spectrum /
- non-stationary random response /
- dynamic reliability

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参考文献(7)

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