一、前言 1.結构物的設計一般包括两个内容,即結构强度分析和結构安全度分析。目前鋼筋混凝土結构强度分析基本上一直是沿用彈性理論分析,結构安全度分析过去曾采用過用資用应力的方法設計断面(我們用彈性分析——資用应力表示,下同)。1952年改用彈性分析——破損阶段理論;1956年改用彈性分析——极限状态理論的方法,即目前通用的方 I. Introduction 1. The design of structures generally includes two components, namely structural strength analysis and structural safety analysis. At present, the strength analysis of reinforced concrete structures has been based on elastic theory analysis. Structural safety analysis used to use the method of using stress to design cross sections (we use elastic analysis - asset stress, the same below). In 1952, it changed to elasticity analysis—the theory of damage stage; in 1956, it used elasticity analysis—the method of limit state theory, that is, the current universal method.