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为研究配有钢纤维活性粉末混凝土(RPC)免拆柱模的钢筋混凝土短柱的轴压力学性能与钢纤维RPC免拆柱模对核心钢筋混凝土短柱轴压承载力的提高效果,对2根配有不同壁厚钢纤维RPC免拆柱模的钢筋混凝土方形短柱和用于对比的1根普通钢筋混凝土方形短柱进行了轴压试验研究;采用有限元模型对试验结果进行了验证,根据试验结果及有限元分析结果,探讨了配有钢纤维RPC免拆柱模的钢筋混凝土短柱轴压承载力计算方法。结果表明:钢纤维RPC免拆柱模显著提高了钢筋混凝土短柱的极限承载力,且延缓了纵筋的屈服;随免拆柱模壁厚的增加,钢筋混凝土短柱轴向变形随之减小,极限承载力随之提高,延性也相对提高;免拆柱模不但限制了钢筋混凝土短柱在轴向压力作用下的侧向变形,而且间接减小了轴向变形;有限元计算结果与试验结果吻合良好,该计算方法可为工程实践提供参考。
In order to study the axial compressive properties of reinforced concrete short columns with steel fiber reactive powder concrete (RPC) disassembly mandrel and the effect of steel fiber RPC demounting column on axial compression bearing capacity of core reinforced concrete short columns, Axial reinforced concrete short columns with different wall thickness steel fiber RPC demolition column molds and one ordinary reinforced concrete square short column for comparison were tested. The finite element model was used to verify the test results, Based on the test results and the results of finite element analysis, the calculation method of axial compressive bearing capacity of reinforced concrete short columns with steel fiber RPC demolition column mode is discussed. The results show that the steel fiber RPC demolition column mode significantly increases the ultimate bearing capacity of reinforced concrete short columns and slows the yielding of longitudinal reinforcement. With the increase of wall thickness of demountable column, the axial deformation of reinforced concrete short columns decreases The ultimate bearing capacity is small and the ductility is relatively improved. The disassembly of the column mold not only limits the lateral deformation of the reinforced concrete short column under axial pressure, but also indirectly reduces the axial deformation. The results of finite element analysis The test results are in good agreement. The calculation method can provide reference for engineering practice.