基于设定地震的重大工程场地设计反应谱的确定方法

场址设计地震动参数的合理确定是重大工程抗震安全分析的重要环节之一。本文分析了基于地震危险性概率分析方法所得到的一致概率反应谱所存在的问题和不足，提出了一个新的反应谱确定方法，其直接采用不经烈度转换的反应谱衰减关系式且以场地相应设防概率水平的地震动峰值加速度为前提，采用发生概率最大的原则和与潜在震源中主干断裂相关联的原则确定场地相关设计反应谱。实例分析表明，该方法所确定的设计地震及场址反应谱参数较为合理，易于为工程设计人员所接受，并能满足工程抗震设计需求。

Determination of design response spectrum for important structures based on scenario earthquake

The determination of proper ground motion parameters is vital to the seismic safety analysis of important structures. In this paper, the problems and shortcomings of probability-consistent response spectrum based on probability seismic hazard analysis are discussed and a method for determining the design response spectrum is proposed. The method does not need seismic intensity conversion and uses the peak ground motion acceleration corresponding to the specific probability of seismic setting of site in consideration as basic input. The principles adopted are the maximum likelihood probability and the corelationship of main fault of potential seismic source zone. Application of this method shows that it provides better results on design ground motion and site response spectrum parameters and is easy to be accepted by designers, at the same time it meets the requirements of seismic design.