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通过20个先张法构件预应力螺旋肋(HR)钢棒的预应力传递长度试验,详细分析钢棒有效预应力、混凝土抗拉强度、钢棒直径和配箍率等因素对预应力传递长度的影响,得出预应力HR钢棒相对预应力传递长度与钢棒有效预应力近似呈正比关系,与放张时混凝土抗拉强度近似呈反比关系;在试验数据的基础上,依据HR钢棒黏结锚固性能试验研究的结果,提出预应力HR钢棒的预应力传递长度计算公式。
The prestressed force transmission length of prestressed spiral rib (HR) steel bars of 20 pretensioned components was analyzed in detail. Factors such as the prestressing force of steel bars, the tensile strength of concrete, the diameter of steel bar and the stirrup ratio were analyzed in detail. The results show that the relative prestressing transfer length of prestressed HR steel bars is approximately proportional to the effective prestressing force of steel bars and the tensile strength of concrete is approximately inversely proportional to the tensile strength of prestressed HR steel bars. Based on the experimental data, Bond anchoring performance test results, put forward prestressed HR steel bar prestress transmission length formula.