For the size effect on quasi-brittle materials such as concrete, related researches have been carried out for many years. However, related test studies combined with concrete structures or components are not sufficient. This article is based on experimental studies of 13 reinforced concrete beams, carrying out experimental research on five different section size beams. The section height of the biggest experimental specimen is 1 000 mm. Test data during different loading stages were obtained. Analysis on test results shows that the size effect of flexural behaviors of RC beams mainly reflects in reinforcement yielding stage and concrete crushing stage. Strength and ductility show a growing trend with specimen size increasing. The safety of calculation theory of RC beam bearing capacity in chinese code is verified indirectly.%现阶段钢筋混凝土结构分析方法与计算理论主要基于小尺寸构件试验结果,对大尺寸构件开展尺寸效应的试验研究还不多,相关理论验证尚不充分.文章针对13个钢筋混凝土梁开展尺寸效应试验研究,详细测试并采集不同加载阶段构件的承载力、挠度、钢筋与混凝土应变等试验数据,最大试验梁截面高度1000 mm.研究结果表明:随受弯试件截面尺寸增大,受压区混凝土材料的强度和极限变形能力均呈减小趋势,混凝土材料抗压性能尺寸效应反映到正截面承载性能中,对受弯承载力产生负面尺寸效应；而内力臂和钢筋等影响因素对受弯承载力产生显著的正面尺寸效应.随试件尺寸增大,受弯构件强度和延性储备整体呈现增长趋势,从而间接验证了现阶段受弯承载力计算理论的安全性.
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