由于震害预测包含着众多的模糊概念,笔者建立了一个以多分量“IF……THEN……”近似推断为主的新的震害预测模型。本文讨论这个模型中关于场地土影响的处理,主要包括两点:(1)场地土条件与地面加速度水平分量峰值PGA之间的关系;(2)如何评定场地土类别,即怎样建立模糊集S的问题。这两点对于建立震害预测模型是十分重要的,对于小区域划分、抗震设计也具有实用意义。 Because the earthquake damage prediction contains many fuzzy concepts, the author has established a new earthquake damage prediction model based on the approximate inference of multiple components “IF ...... THEN ......”. This paper discusses the treatment of site soil effects in this model, which mainly includes two points: (1) the relationship between the site soil conditions and the peak PGA of ground acceleration components; (2) how to assess the site soil category, that is, how to set up the fuzzy set S The problem. These two points are very important for the establishment of earthquake damage prediction model, and also have practical significance for small area division and seismic design.