混凝土受压力学性能统一计算方法

Unified calculation method of compressive mechanical properties of concrete

目前国内对普通混凝土(C60以下)、高强混凝土(C60～C100)和超高强混凝土(C100以上)的力学性能指标采用分区描述,导致不同计算公式在分区边界处计算结果误差较大,且适用性较差。本文通过对国内大量的普通混凝土、高强混凝土和超高强混凝土轴心受压试验研究资料的重分析发现混凝土强度等级在C10～C140范围时其各力学性能指标均具有连续变化规律。本文基于统计分析方法,提出了适用于各种混凝土强度等级的尺寸换算系数、轴心抗压强度、弹性模量、轴心受压峰值应变和混凝土轴心受压应力-应变全曲线等统一计算公式,其计算结果与实测结果吻合较好。本文研究成果对进一步开展混凝土结构的非线性有限元分析和设计具有参考价值。

Researchers at home nowadays adopt divisional description for the mechanical indexes of normal strength concrete (<C60), high strength concrete (C60～C100) and extra high strength concrete (>C100), which lead to calculated results error of different calculation formulas at divisional borderline and poor applicability. Through reanalyzing a large numbers of test results of axial compression of normal strength concrete, high strength concrete with extra high strength concrete at home, this paper finds the regularity of continuous variation of mechanical indexes of concrete with strength grade ranging from C10 to C140. Based on statistic analysis, this paper proposes the empirical calculation formulas which can be applied to various strength of concrete for size effect coefficient, axial compressive strength, elastic modulus, peak strain of axial compression and stress strain curves. A comparison of calculated results with experimental results shows good agreement. Finally, research achievements offered by this paper have reference for the further non linear finite element analysis and design of reinforced concrete structure.