基于进化策略算法拟合多阻尼比反应谱的地震动仿真

Simulation of earthquake ground motions compatible with multi-damping-ratio-spectra based on evolutionary strategy algorithm

拟合多阻尼比反应谱的人造地震波是新抗震规范提出的要求。本文引入多目标优化概念和进化策略算法,提出拟合多阻尼比反应谱的地震动仿真方法,解决了传统地震动仿真中的多阻尼比反应谱拟合精度较差的问题。算例表明,该方法可获得优化问题的近似Pareto最优解集,在拟合多阻尼比反应谱的人造地震波集系的仿真方面有传统方法所不能比拟的优势,产生的人造波或人造波集系可满足工程抗震设计需要。

Simulation of earthquake ground motions compatible with multidamping ratiospectra is demanded by the code for seismic design of buildings. By introducing the concept of multiobjective optimization and evolutionary strategy algorithm a method for simulation of ground motions is proposed in this paper. The precision of simulation of ground motions compatible with multidamping ratiospectra may be improved comparing with the traditional method. The Pareto optimal solution set can be obtained conveniently by the simulation method, which is difficult by the traditional one. It is adequate to meet the needs of simulation of ground motions compatible with multidamping ratiospectra in seismic design.