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当约束混凝土柱的体积配箍率大于某一限值时,在受压破坏时会出现约束箍筋达不到其受拉屈服强度的问题。为此,基于收集的试验数据,建立了以体积配箍率、箍筋受拉屈服应变以及非约束混凝土轴心抗压强度为变量的约束混凝土抗压强度和峰值应变计算公式。将该约束混凝土抗压强度计算公式与传统约束混凝土抗压强度计算公式联立,得到了不同强度等级箍筋体积配箍率上限值。结果表明:体积配箍率上限值随箍筋抗拉强度的提高而降低;在体积配箍率上限值范围内,约束混凝土抗压强度与峰值压应变随体积配箍率和箍筋受拉屈服强度的增大而提高。
When the volumetric confinement ratio of the confined concrete column is greater than a certain limit value, the constraining stirruns will not reach the yield strength of their tension under compression failure. Therefore, based on the collected experimental data, the formulas of compressive strength and peak strain of the confined concrete with volumetric stirrup ratio, stirrup tensile yielding strain and unconfined concrete axial compressive strength as variables are established. The calculated formula of the compressive strength of the confined concrete was contrasted with that of the traditional confined concrete, and the upper limit of the stirrup ratio of stirrups with different strength grades was obtained. The results show that the upper limit of the volumetric stirrup rate decreases with the increase of the tensile strength of the stirrup. Within the upper limit of the stirrup ratio, the compressive strength and peak compressive compressive strength of the confined concrete vary with the volumetric stirrup ratio Pull yield strength increased and increased.