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钢筋混凝土构件的宏观力学性能由其组分—钢筋和混凝土两部分的力学性能决定。结合混凝土细观结构形式,认为混凝土是由骨料颗粒、砂浆基质及界面过渡区组成的复合材料,假定钢筋与混凝土之间完好粘结,基于钢筋混凝土柱偏心受压试验,建立了钢筋混凝土柱偏心受压加载下力学特性及破坏行为研究的细观尺度力学分析模型。通过对混凝土方形和矩形试件进行受压力学特性模拟,采用反演法确定了界面的力学参数,进而模拟了钢筋混凝土柱偏心受压加载下的宏观力学性能。结果表明,相比于宏观尺度模型,细观数值分析模型能够充分体现材料的非均质性,能够较好的模拟试件的宏观力学性能,并且能够细致的描述裂缝发展及试件破坏过程,与试验结果吻合良好。该文建立的细观尺度分析模型与方法,为钢筋混凝土构件层次宏观力学非线性及其尺寸效应研究提供了理论支持。
The macroscopic mechanical properties of reinforced concrete members are determined by the mechanical properties of the two parts of steel reinforced concrete and concrete. Combined with the meso-structure of concrete, it is considered that concrete is a composite material composed of aggregate particles, mortar matrix and interfacial transition zone. Assuming the perfect bond between steel bar and concrete, based on the eccentric compression test of reinforced concrete column, Meso - scale mechanics analysis model of mechanical behavior and failure behavior under eccentric compression loading. The mechanical properties of the square and rectangular specimens of concrete are simulated by the mechanics of compression and the mechanical parameters of the interface are determined by the inversion method. Then the macroscopic mechanical properties of the reinforced concrete columns subjected to eccentric compression are simulated. The results show that compared with the macroscale model, the mesoscopic numerical analysis model can fully reflect the material heterogeneity, can simulate the macroscopic mechanical properties of the specimens well, and can describe the fracture development and specimen destruction process in detail. Good agreement with the test results. The mesoscopic scale analysis model and method established in this article provide theoretical support for the macro-mechanical nonlinearity and its size effect in reinforced concrete members.