基于非均匀调制函数模型的非平稳地震动模拟

摘要

By investigating model method of ground motion evolutionary spectrum, and based on the accurate estimation of time⁃varying power spectra and nonlinear optimization method, we recognize parameters of the non⁃uniform modulation model of ground motion and establish a simulation method of the non⁃stationary ground motion based on the non⁃uniform modulation model. Through the simulation examples with initial ground motion and the model parameters directly, it can be proved that the ground mo⁃tion simulated by the proposed method can perform non⁃stationary behavior correctly, and agree with the response spectrum of the target accurately.%通过对地震动演变谱模型化分析，在精确估计地震动时变功率谱的基础上，利用多元函数目标优化方法识别地震动的非均匀调制函数模型参数，从而建立了基于非均匀调制函数模型的时频非平稳地震动模拟方法。对给定初始地震波和直接给定模型参数2个算例的分析表明，应用本文方法模拟的地震波可以较好实现时频非平稳，而且对目标反应谱也具有较好的拟合精度。