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钢筋混凝土构件的尺寸效应主要是:1)混凝土材料本身的非均质性和力学非线性;2)钢筋/混凝土相互作用的高度复杂性共同导致的。随着建筑结构尺寸不断变大,高强混凝土的应用越来越广泛,其高脆性使得其尺寸效应行为更加明显。此外,钢筋混凝土构件大多处于复杂加载条件下,进而使得其尺寸效应问题变得尤为复杂。该文设计了最大截面尺寸为800 mm×800 mm的16组几何相似高强钢筋混凝土柱,对其在轴向受压单调加载及循环重复加载下的力学行为进行了试验研究,并对其名义轴压强度的尺寸效应进行了分析。结果表明:1)高强钢筋混凝土柱的破坏模式受到加载模式的显著影响;2)随试件尺寸变大,高强钢筋混凝土柱耗能能力减弱;3)较单调加载情况,轴向受压循环重复加载下高强钢筋混凝土柱的破坏表现出更强的脆性,且名义轴压强度减小,尺寸效应更显著;4)Ba?ant提出的“尺寸效应律”能够较好地描述大尺寸高强钢筋混凝土柱名义轴压强度的尺寸效应规律。
The size effect of RC members mainly includes: 1) the heterogeneity and mechanical nonlinearity of concrete; 2) the high complexity of the interaction between rebar and concrete. With the ever-increasing size of the building structure, the application of high-strength concrete is more and more widespread, and its high brittleness makes the size effect more obvious. In addition, most of the reinforced concrete members are under complicated loading conditions, which further complicates the size effect. In this paper, 16 sets of geometrically similar high-strength RC columns with a maximum cross-section of 800 mm × 800 mm were designed and their mechanical behavior under monotonic loading and cyclic loading under axial compression was experimentally studied. The nominal shaft The size effect of compressive strength was analyzed. The results show that: 1) the failure modes of high strength reinforced concrete columns are significantly affected by loading modes; 2) the energy dissipation capacity of high strength reinforced concrete columns decreases with the increase of specimen size; 3) The failure of high-strength reinforced concrete columns under loading shows more brittleness and the nominal axial compressive strength decreases, and the size effect is more remarkable.4) The “size effect law” proposed by Ba? Ant can well describe the large size and high strength Size Effect Law of Axial Compressive Strength of Reinforced Concrete Column.