| 引用本文: | 邢国华,赵嘉华,常召群,王浩楠,陆勇健.形状记忆合金嵌入式加固钢筋混凝土柱抗震性能试验[J].哈尔滨工业大学学报,2025,57(2):78.DOI:10.11918/202312025 |
| XING Guohua,ZHAO Jiahua,CHANG Zhaoqun,WANG Haonan,LU Yongjian.Seismic behavior of RC columns strengthened with near-surface mounted shape memory alloy bars[J].Journal of Harbin Institute of Technology,2025,57(2):78.DOI:10.11918/202312025 |
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| 摘要: |
| 为研究形状记忆合金(SMA)嵌入式加固法对钢筋混凝土柱抗震性能的影响,设计制作6根SMA嵌入式加固钢筋混凝土柱试件,通过低周往复荷载试验研究SMA筋加固混凝土柱的破坏过程及破坏模式,分析SMA加固量、轴压比和环包CFRP布对加固柱滞回性能、位移延性、刚度退化和耗能等抗震性能的影响,基于数字图像相关法分析SMA筋嵌入式加固柱的曲率分布。结果表明:SMA筋嵌入式加固钢筋混凝土柱因柱脚处纵向受拉钢筋屈服和混凝土压溃形成塑性铰而破坏,主要表现为延性破坏模式；相同轴压比下,加固柱试件较普通混凝土柱承载力提高了51.2%~70.2%,位移延性和累计耗能也得到提升,抗震性能显著改善；随加固量增加,SMA筋嵌入式加固柱的耗能、塑性铰长度和极限位移显著提高；在层间位移角达到1/50之前,承载力没有明显下降；轴压比增大至0.4时,加固柱的峰值荷载和耗能能力增大,延性显著降低,环包CFRP布后加固柱的变形和耗能明显改善。基于平截面假定,提出SMA筋嵌入式加固钢筋混凝土柱受弯承载力计算模型,计算结果与试验结果吻合良好。 |
| 关键词: 钢筋混凝土柱 形状记忆合金 抗震性能 嵌入式加固 承载力 数字图像相关法 |
| DOI：10.11918/202312025 |
| 分类号:TU375.3 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(6,7)；陕西省自然科学基金(2023-JC-QN-0617)；中央高校基本科研业务费专项资金(300102281303) |
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| Seismic behavior of RC columns strengthened with near-surface mounted shape memory alloy bars |
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XING Guohua,ZHAO Jiahua,CHANG Zhaoqun,WANG Haonan,LU Yongjian
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(School of Civil Engineering, Chang′an University, Xi′an 710061, China)
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| Abstract: |
| To investigate the effect of the near-surface mounted (NSM) technique using shape memory alloy (SMA) bars on the seismic performance of reinforced concrete columns, six reinforced concrete (RC) columns strengthened with near-surface mounted (NSM) shape memory alloy (SMA) bars were designed and fabricated to investigate the failure process and failure modes of SMA-reinforced concrete columns through low-cyclic reversed loading tests. The effect of SMA reinforcement ratios, axial compression ratio and CFRP wraps on the seismic performance of the columns, including hysteresis performance, displacement ductility, stiffness degradation, and energy dissipation capacity of those columns, were analyzed. Additionally, the curvature distribution of reinforced concrete columns strengthened with near-surface mounted SMA bars was analyzed based on the displacement field provided by the digital image correlation (DIC) method. Results indicated that the failure of concrete columns reinforced with SMA bars results from the yield of longitudinal tension reinforcement and concrete crushing at the column base, forming plastic hinges. This primarily exhibits a ductile failure mode. Under the same axial compression ratio, the load bearing capacity of the strengthened columns increased by 51.2% to 70.2% compared to ordinary RC column. Displacement ductility and the cumulative energy dissipation of the columns were also increased, significantly enhancing the seismic performance. As the amount of SMA reinforcement increased, the energy dissipation capacity, the length of the plastic hinges and the ultimate displacement of the strengthened columns greatly improved. The bearing capacity of the strengthened columns did not show a significant decrease before the drift ratio reached 1/50. As the axial compression ratio increased to 0.4, the peak load and energy dissipation capacity increased, while the ductility decreased significantly. The deformation performance and energy dissipation capacity of the columns wrapped with CFRP improved obviously. Additionally, based on the plane sections assumption, a theoretical calculation model that predicts the flexural bearing capacity of the SMA bar strengthened columns was established. The calculated results were in good agreement with the test results. |
| Key words: reinforced concrete column shape memory alloys seismic behavior near-surface mounted bearing capacity digital image correlation method |
