摘要
本文将经验格林函数法和人造地震动反应谱拟合技术有机地结合起来,提出了一种新的人造地震动方法。利用已有的场地附近的小震记录合成可能发生的大震地面运动,以此作为人造地震动的初始值,通过反复调整初始加速度的傅氏幅值谱来拟合给定的目标反应谱,以得到满足精度要求的人造地震加速度时程。本文方法可以考虑地震环境和局部场地对地震动的影响。所合成的地震加速度时程具有时间强度和频率含量的非平稳特征,并且不需要人为规定强度包线。
By combining the empirical Green' s function method with the technique of generating response spectrum-compatible ground motion,a new method for generating earthquake time-history is suggested. In which,the ground motion of a future strong earthquake is synthesized by using smaller earthquake record available in the region,and it is taken as an initial accelerogram of generating ground motion. By adjusting the amplitude of the initial data' s Fourier components to match a particular ordinate of the target response spectrum,the accelerograms that we need can be obtained. The effects of earthquake source site,direction of fault cracking,medium,and the local soil condition on the ground motion are taken into account in the method presented here. The simulated accelerograms are of nonstationary characteristics in time and frequency. And the envelope function of acceleration time history is not emerging in the generating procedure.
出处
《地震工程与工程振动》
CSCD
北大核心
1992年第4期9-15,共7页
Earthquake Engineering and Engineering Dynamics
基金
水利水电部水利水电科学基金委员会
