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本文根据实验结果及理论分析,提出混凝土局部承压的楔劈破坏机理,并以库伦假设作为核芯混凝土剪切破坏的基础,导出局部承压强度的计算公式,提出偏心局压情况下,按“同心、对称、有效面积”原则确定底面积A_d的新方法。与现行钢筋混凝土结构设计规范(TJ 10-74)中的方法相比,本文提出的方法不仅取值简单,计算效果也有所改善。本文还对配筋混凝土局压强度的计算方法提出了改进的建议。
Based on the experimental results and theoretical analysis, this paper proposes the mechanism of the wedge failure of the concrete partially confined by pressure, and uses the Coulomb hypothesis as the basis of the shear failure of the core concrete to derive the calculation formula of the local bearing strength, and proposes that under the condition of eccentric partial pressure, The principle of “concentricity, symmetry, effective area” determines the new method of bottom area A_d. Compared with the existing methods in the design specification of reinforced concrete structures (TJ 10-74), the proposed method not only has a simple value, but also improves the calculation results. This paper also puts forward some suggestions for improving the calculation method of the partial compressive strength of reinforced concrete.