一、概述以概率论为基础的极限状态设计法在各学科中推广应用形成的可靠度理论,近一时期得到了发展,近年来在土木工程上也已盛行。可靠度理论最初是由评价电路随机负荷容量稳定性上发展起来的,其后在分析地震对结构稳定性分析、原子能发电站安全性评价中也推广应用。这一理论虽在二次世界大战前就有,可是直到近二十年来才在世界各学科范围广泛传 I. Overview The theory of limit state based on probability theory popularized and applied in various disciplines to form the theory of reliability, which has been developed in recent period. In recent years, it has also prevailed in civil engineering. Reliability theory was originally developed from the random load capacity stability of the evaluation circuit, and was also applied in the analysis of structural stability analysis and safety evaluation of atomic power stations afterwards. Although this theory existed before the Second World War, it has not been widely disseminated in all disciplines in the world for nearly two decades