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1 简介用塑性理论分析钢筋混凝土的主要障碍是钢筋混凝土结构构件各部分之间的转动受到限制。混凝土各部分明显弱化,即在产生最大塑性变形之后,其承受弯矩的能力随其转角的增大而降低,而各段钢筋却呈强化趋势。图1是跨中受集中力作用的混凝土梁在作用力所在截面处的典型的力矩-转角曲线。该截面的配筋率符合下列规定:澳大利亚混凝土结构标准:A_s3600;英国混凝土标准:B_68110;ACI标准:318。从图l可知,a是M-φ曲线上弱化支的斜率与弹性段斜率的比值。作用力由一个能控制位移的试验机提供,而转角则取长
1 Introduction The main obstacle to analyzing reinforced concrete with plastic theory is the limited rotation of the various components of the reinforced concrete structural member. Concrete parts significantly weakened, that is, the maximum plastic deformation occurs, the ability to withstand bending moment decreases with the increase of its corner, and each section of steel tend to intensify. Figure 1 shows a typical moment-rotation curve of a concrete beam subjected to concentrated forces across the span at the cross-section where the forces are acting. The section of the reinforcement ratio in line with the following provisions: Australian Concrete Structure Standard: A_s3600; British Concrete Standard: B_68110; ACI Standard: As can be seen from Figure 1, a is the ratio of the slope of the weakened branch to the slope of the elastic section on the M-φ curve. The force is provided by a test machine that can control the displacement, while the corners are longer