考虑黏结滑移效应对钢筋混凝土内力的影响

The Inf luence of the Bond-Slip Behavior on Internal Force of Reinforced Concrete

钢筋混凝土的黏结滑移性能会影响构件的受拉刚度,但是在工程设计中,忽略了考虑黏结滑移对钢筋混凝土内力的影响,这会对计算结果造成很大的误差.通过对两端固定连接的钢筋混凝土杆件在跨中区域的轴向力作用下的弹塑性性能进行研究,推导了考虑黏结滑移的内力计算公式,同时使用ANSYS软件模拟出未滑移阶段的黏结应力与钢筋应力的比例系数计算公式,并通过与实验结果的比较,验证了计算公式的准确性.通过算例对比分析发现,考虑黏结滑移和不考虑黏结滑移时算例的内力计算结果差异很大,最大内力误差将近80%左右,因此认为钢筋与混凝土黏结滑移的影响是不可忽略的.

Bond-slip behavior have an influence on stiffness of reinforced concrete tension component. But in engineering designs, the effect of the bond-slip behavior to the reinforced concrete internal force is neglected. It will lead lots of errors to the calculation results. In this paper, the loading of reinforced concrete structure in elastic- plastic range was researched under axial force at mid-span section with considering the nonlinear behavior, the formulas for calculating elastic-plastic internal force were derived from the bond-slip behavior. Using the ANSYS software to simulating the proportional coefficient of the bond stress and the steel stress calculation formula. Though the comparison of the experimental results, the calculation formula is accurate. The examples turn out to see that there is a large error in calculation results between considering and without considering the bond-slip behavior. The maximum error nears upon 80%. Therefore the effect of the bond-slip behavior cannot be neglected.