我国新编的《建筑结构设计统一标准》(初稿)(以下简称《统一标准》)采用了以概率理论为基础的极限状态设计方法,即考虑随机变量分布类型的一次二阶矩方法。在这种方法中,建筑结构的可靠度是以结构的“失效概率(P_f)”或与其相对应的“可靠指标(β)”来度量的。而P_f或β,则需根据结构极限状态函数中各基本变量的统计 China’s newly compiled “Unified Standard for Architectural Structure Design” (first draft) (hereinafter referred to as the “Uniform Standard”) adopts a limit state design method based on probability theory, that is, a second-order moment method considering the distribution type of random variables. In this method, the reliability of the building structure is measured by the structure’s failure probability (P_f) or its corresponding reliability index (β). The P_f or β must be based on the statistics of the basic variables in the structure limit state function.