Y型偏心钢支撑加固弱柱RC框架结构的滞回性能模拟及参数分析

Numerical simulation and parametric analysis of hysteretic behavior of RC frames retrofitted with Y-shaped eccentric steel brace

为了系统研究Y型钢支撑加固RC框架的滞回性能,采用通用有限元程序ABAQUS对试验试件RCF-YB2进行了模拟验证。在此基础上,系统分析了低周往复荷载作用下框架柱截面、框架柱纵筋配筋率及框架柱配箍率对此类加固结构的滞回性能、水平承载力、抗侧刚度、耗能能力的影响。研究结果表明,框架柱截面对结构的水平承载力、抗侧刚度、耗能影响显著;框架柱纵筋配筋对结构的水平承载力、抗侧刚度、耗能影响较小;框架柱配箍率对结构的水平承载力、抗侧刚度、耗能能力影响可忽略。

In order to systematically investigate the hysteretic behavior of RC frames retrofitted by Y-shaped eccentric steel brace, the test specimen RCF-YB2 was simulated and verified by the finite software ABAQUS. Based on the test, a systemic analysis was made on the influence of the column section, the reinforcement ratio of column and the stirrup ratio of column under the low cyclic loading on the hysteretic behavior, lateral strength, stiffness degradation and energy dissipation. The results show that the column section has a significant effect on bearing capacity, energy-dissipation capacity and lateral stiffness; and the reinforcement ratio of column has little effect on bearing capacity, energy-dissipation capacity and lateral stiffness; but the influence of the stirrup ratio of column on the bearing capacity, energy-dissipation capacity and lateral stiffness could be neglected.