预应力钢绞线网加固钢筋混凝土柱恢复力模型非线性数值分析

NONLINEAR NUMERICAL ANALYSIS RESTORING FORCE MODEL OF PRESTRESSED HIGH STRENGTH STEEL WIRE REINFORCED CONCRETE COLUMN

分析预应力钢绞线网加固钢筋混凝土柱在地震荷载作用下的受力特性,对该加固技术的应用与推广具有重要的意义。基于往复荷载作用下截面非线性数值模拟计算方法,主要分析钢筋和预应力钢绞线约束混凝土的本构模型、塑性铰计算对骨架曲线影响,且对横向预应力的计算重新定义。分别对预应力度为0, 24.5%, 32.7%,轴压比为0.4,3根圆形截面柱进行恢复力模型非线性数值分析,结果表明:采用更加完善的材料本构模型提高各特征点的计算精度,塑性铰对峰值点的影响明显。结合Clough恢复力模型滞回规则,考虑轴压比、配箍率以及钢绞线特征值对截面刚度变化影响,得到的滞回曲线与试验结果相吻合。提出的恢复力模型考虑了多种主要影响因素,同时得到了试验验证,可为实际工程的设计与应用提供理论依据。

Analysis the characteristics of prestressed steel wire mesh reinforcement the reinforced concrete column under seismic load, has important significance to application and promotion this reinforcement technology. Based on the method of nonlinear numerical simulation under reciprocating loading. This article mainly analyzes the steel bar and confined concrete constitutive model, plastic hinges, and to redefine transverse prestressing. Respectively for prestressed degree of 0, 24.5%, 32.7%, axial compression ratio 0.4, 3 circular cross section column restoring force model nonlinear numerical analysis;the results show that the material constitutive model to improve the calculation precision of the feature points, the plastic hinge of peak point effect is obvious. Combining with Clough restoring force model of hysteresis rules, axial compression ratio, stirrup ratio, steel strand characteristic value of cross section stiffness change, the hysteretic curve is consistent with the experimental results. The restoring force models proposed in this paper consider a variety of main influence factors. Further more, they considered main influenced facts and are verified by the testing, and provide theoretical basis for the design and application of actual engineering.