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中文摘要：
针对尺寸效应特性对梁构件受弯破坏的影响机理，对不同截面尺寸简支梁相似试件开展单调加载试验，测试构件在不同加载阶段的承载力、挠度：和截面应变等试验数据．按不同加载阶段分析其力学性能的影响因素，并阐述其；破坏机理的尺寸效应．试验分析表明，混凝土材料抗压特性在受弯构件力学性能中表现为负面尺寸效应，这种负面尺寸效应对构件整体力学行为的影响并不显著．相比之下，内力臂和钢筋等因素对试件承载力和延性均产生显著的正面影响．随截面尺寸增大，受弯承载力和延性均呈增长趋势．根据试件在不同尺度上表现出的显著破坏特征和实测数据，推导相关计算参数随试件尺寸的关系，建立考虑尺寸效应的极限承载力计算方程．同时也验证了现有极限承载力计算理论的安全性．
英文摘要：
Size effect is concrete inherent characteristic and has an effect on beam bending failure mechanism. Bending experiments based on different section size RC free beams were carried out and test data was collected in different loading stage, including bearing capacity, deflection, section strain etc. Size effect factors and failure mechanism were analyzed according to different loading stage. Concrete compressive properties show negative size effect in bending member mechanical properties, but it is not significant in overall mechanical behaviors. Internal force arm and longitudinal reinforcement have positive effect to flexural bearing capacity and ductility. Flexural bearing capacity and ductility show a growing trend with member size increasing. Failure characteristics and measured data show significant difference in specimen size. Related calculation parameters which have a relationship with section height are derived, and then ultimate bearing capacity calculation equations with size effect related are established. Bearing capacity calculation theories in current specifications are proved to be safe in research scale.
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A meso-scale analysis method for the simulation of nonlinear damage and failure behavior of RC membe
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