结构安全度是关系到工程建设安全和经济的重大问题,它是各国结构设计理论与规范标准研究中的一个主攻项目。近二十年来的发展特点,是以概率论可靠度理论作为结构安全度的理论基础,并于七十年代中期在设计标准规范中进入实际应用阶段。结构安全性可以用“概率”来表达,这就使原来比较抽象的问题成为一个可用数学方法处理的问题,使工程结构的安全与经济之间的矛盾有了较为科学的分析研究和解决办法,这是结构设计理论的一项重大发展。当前,结构安全度已由惯用的定值设计法逐步向概率设计法过渡,国际上在这方面的研究工作相当活跃,北美和西欧在理论研究和规范实用方 Structural safety is a major issue that is related to the safety and economy of construction. It is a major project in the study of structural design theory and normative standards in various countries. The development characteristics of the past two decades are based on the reliability theory of probability theory as the theoretical basis of structural safety, and entered the practical application stage in the design standards in the mid-1970s. Structural safety can be expressed by “probability”, which makes the original abstract problem become a problem that can be dealt with by mathematical method, and makes the conflict between safety and economy of engineering structure have more scientific analysis and research and solution, This is a major development of structural design theory. At present, the degree of structural safety has been gradually shifted from the conventional design method to the probability design method. The international research work in this field is very active. In North America and Western Europe,