塑性铰区配置ECC可恢复功能再生混凝土柱的滞回性能

    Hysteretic Performance of Resilient Recycled Aggregate Concrete Columns Reinforced With ECC in Potential Plastic Region

    • 摘要: 为进一步减轻可恢复功能再生混凝土(recycled aggregate concrete,RAC)柱在强震作用下的损伤程度并提升其抗震减灾能力,将工程水泥基复合材料(engineered cementitious composites,ECC)应用于其塑性铰域,进行了ECC-RAC复合柱低周反复荷载试验及数值模拟,分析了柱底塑性铰域ECC、配箍率、轴压比对其滞回性能的影响规律,研究结果表明,在塑性铰域使用ECC可显著减小柱的残余变形,减轻大变形状态下的损伤程度,提高柱的峰值承载力和变形能力;在水平位移角小于3.5%时,残余位移和裂缝宽度均满足可修复限值的要求;增大配箍率与降低轴压比可减轻复合柱的损伤程度,提高其可修复性能和耗能能力;基于有限元参数分析,建议配箍率控制在1.5%~2.0%。

       

      Abstract: To further mitigate the degree of damage to resilient recycled aggregate concrete (RAC) columns under strong earthquakes, and to improve earthquake resistance and disaster mitigation capacity, engineered cementitious composites (ECC) were applied to their plastic hinge regions. Cyclic loading tests and numerical simulations of ECC-RAC composite columns were conducted. The influence of ECC in the plastic hinge region at the column bottom, stirrup ratio, and axial compression ratio on their hysteretic performance were analyzed. The research results show that the use of ECC in the plastic hinge region can significantly decrease the residual deformation of the columns, reduce the damage degree under large deformation conditions, and improve the peak bearing capacity and deformation capacity of the columns. When the horizontal displacement angle is less than 3.5%, both the residual displacement and crack width satisty repairable limits. Increasing the stirrup ratio and reducing the axial compression ratio can lessen the damage degree of the composite columns, and improve their repairable performance and energy dissipation capacity. Based on the results of finite element parameter analysis, it is recommended that the stirrup ratio be controlled between 1. 5% and 2.0%.

       

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