基于小波包方法的非平稳地震动模拟和设计谱拟合

发布时间：2018-02-28 12:44

本文关键词： 地震动模拟谱兼容加速度时程小波包非平稳时程　出处：《大连理工大学学报》2016年03期 　论文类型：期刊论文

【摘要】：提出了一种基于小波包分解和重构的模拟非平稳地震动并拟合设计谱的方法.该方法模拟出工程用地震动并调整频率分量,使其以一定的精度拟合设计谱.首先,利用5个参数生成了构成地震动加速度时程的小波包系数矩阵,并通过小波包重构获得加速度时程,该系数矩阵模拟了实际地震记录中频率随持时逐渐减小的特点.其次,将模拟的地震动利用小波包分解方法分解为具有高分辨率非重叠的小波包系数矩阵,然后根据设计谱调整频率分量.数值算例表明,该方法模拟的不同持时的加速度时程均能吻合同一设计谱,且迭代后仍然能保留地震动的非平稳特性.另外,该方法具有较稳定和较快的收敛过程,能在有限次调整迭代中实现较高的拟合精度.
[Abstract]:A method of simulating non-stationary ground motion and fitting design spectrum based on wavelet packet decomposition and reconstruction is proposed. The method simulates the vibration of engineering land and adjusts the frequency component to fit the design spectrum with certain precision. The wavelet packet coefficient matrix which constitutes the acceleration time history of ground motion is generated by using five parameters, and the acceleration time history is obtained by wavelet packet reconstruction. The coefficient matrix simulates the characteristic that the frequency decreases gradually with the duration of seismic records. The simulated ground motion is decomposed into a high resolution nonoverlapping wavelet packet coefficient matrix by wavelet packet decomposition method, and then the frequency component is adjusted according to the design spectrum. The simulated time-averaged acceleration time of different durations by this method is consistent with the same design spectrum, and the non-stationary characteristics of ground motion can still be preserved after iteration. In addition, the method has a stable and fast convergence process. It can achieve high fitting precision in finite adjustment iteration.
【作者单位】：大连理工大学建设工程学部;
【基金】：国家自然科学基金资助项目(51378092;51121005)
【分类号】：P315.9

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