考虑地面运动不确定性的地面运动记录选择方法研究

分析国内外当前地面运动记录选择方法后，重点指出我国方法中值得改进之处，提出考虑地面运动记录 不确定性的地面运动记录选择方法。并建立Ⅱ类场地地面运动数据库，给出不同震级和距离分组下加速度动力放 大系数谱分布规律，以此体现地面运动的不确定性。最后，以一个工程算例来展示考虑地面运动不确定性的地面 运动记录选择方法的应用过程和结果。算例的动力时程分析结果表明，由此预测出的结构模型地震反应确实存在 着一个明显的分布范围，克服了当前拟合单一目标谱的地面运动记录选择方法抹杀地面运动不确定性的弊端，为 全面了解结构在一定地震风险下抗震性能提供可能。

Study on method for ground motion selection considering uncertainties of ground motions

By analyzing current methods of selecting ground motions in China and worldwide, some aspects of the methods used in China are highlighted to be further improved. A method of selecting ground motions by considering the uncertainty of these records is proposed and the database of ground motions for site category II is established. The distribution of dynamic amplification factor for accelerations under different magnitudes and distance groups is provided to show the uncertainty of the ground motion. Finally, one case study is conducted to show the procedure of the method for selecting ground motions by considering the uncertainty. The results of the nonlinear time history analysis show that the predicted structural response has an obvious of distribution range after this method was adopted. The proposed method can overcome the shortage of previous methods that neglect the uncertainty of ground motions. This method can make it possible to comprehensively understand the structural seismic performance under certain seismic hazard.