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混凝土受压应力—应变曲线是建立钢筋混凝土结构力学一般理论和非线性分析的关键问题之一。1942年,自从Whitney作出了有下降段的应力—应变试验曲线以后,不少学者又进行了大量的研究工作,三十多年来,除继续发展了试验研究外,还提出各种形式的完整应力—应变曲线表达式。本文对一些典型的表达式作出简要的述评;并根据试验曲线的几何特征性和材料的力学性能,建立了数学模型,首次指出了曲线终点坐标应满足的条件;最后,用样条插值函数的形式,提出了混凝土的受压应力—应变关系式。
The stress-strain curve of concrete under compression is one of the key issues in establishing the general theory and nonlinear analysis of reinforced concrete structural mechanics. In 1942, after Whitney made a stress-strain test curve with a descending section, many scholars have conducted a lot of research work. In addition to continuing to develop experimental research, more than 30 years have also been proposed in various forms. Stress-strain curve expression. In this paper, some typical expressions are briefly reviewed; based on the geometric characteristics of the test curve and the mechanical properties of the material, a mathematical model is established. The conditions for the endpoint coordinates of the curve are first indicated. Finally, the spline interpolation function is used. In the form, the compressive stress-strain relationship of concrete is proposed.