基于规范反应谱的全非平稳地震动过程模拟

发布时间：2018-01-08 04:07

本文关键词：基于规范反应谱的全非平稳地震动过程模拟　出处：《振动工程学报》2017年03期 　论文类型：期刊论文

【摘要】：在经典的两类演变功率谱模型基础上,建议了另两类全非平稳地震动过程的演变功率谱模型。为生成与规范反应谱一致的全非平稳地震动时程,将地震动加速度过程分解为两个独立的随机过程,其一为已知演变功率谱的全非平稳地震动过程,其二为修正的非平稳地震动过程。对于第一个随机过程,应用非平稳过程模拟的谱表示-随机函数方法,即可生成代表性时程集合及其平均反应谱。对于第二个随机过程,其演变功率谱是由调制函数和功率谱密度函数组成,而功率谱密度函数则由第一个随机过程的平均反应谱与规范反应谱的拟合误差计算得到。通过对第二个随机过程演变功率谱的修正,可使合成后的全非平稳地震动过程的平均反应谱与规范反应谱拟合一致。最后,算例验证了此方法的有效性和实用性。
[Abstract]:Based on the classical two kinds of evolving power spectrum models, the other two kinds of evolutional power spectrum models for the whole non-stationary ground motion process are proposed, which are consistent with the gauge response spectrum for the generation of all non-stationary ground motion time history. The acceleration process of ground motion is decomposed into two independent stochastic processes, one is the fully non-stationary ground motion process with known evolving power spectrum, the other is the modified non-stationary ground motion process. By using the spectral representation of the simulation of non-stationary processes, the stochastic function method is used to generate the representative time-history set and its average response spectrum. The evolving power spectrum is composed of modulation function and power spectral density function. The power spectral density function is calculated by the fitting error between the average response spectrum and the gauge response spectrum of the first stochastic process, and the power spectrum of the second stochastic process is modified. The average response spectrum of the synthetic non-stationary ground motion process is consistent with the gauge response spectrum. Finally, the effectiveness and practicability of the proposed method are verified by an example.
【作者单位】：防灾减灾湖北省重点实验室(三峡大学);三峡大学土木与建筑学院;
【基金】：国家自然科学基金资助项目(51278282,50808113)
【分类号】：P315.9;TU311.3
【正文快照】： 引言在大型工程结构的抗震设计中,一方面需要采用动力分析来考虑地震动时间过程的影响,另一方面,为研究结构地震反应中的耗能特性和破坏机理,也需要对结构物在地震动作用下的全过程进行动力时程分析。因此,合理地确定地震动输入,是保证结构地震反应分析结果合理性和可靠性的关

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