| 引用本文: | 胡卫兵,罗雨欣,白澄宇,郑山锁.氯盐侵蚀RC梁抗震性能试验与数值模拟方法[J].哈尔滨工业大学学报,2025,57(2):143.DOI:10.11918/202312027 |
| HU Weibing,LUO Yuxin,BAI Chengyu,ZHENG Shansuo.Experimental and numerical simulation methods for seismic performance of RC beams affected by chloride salt erosion[J].Journal of Harbin Institute of Technology,2025,57(2):143.DOI:10.11918/202312027 |
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| 氯盐侵蚀RC梁抗震性能试验与数值模拟方法 |
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胡卫兵1,2,罗雨欣1,2,白澄宇1,2,郑山锁1,2
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(1.西安建筑科技大学 土木工程学院,西安 710055; 2.结构工程与抗震教育部重点实验室(西安建筑科技大学),西安 710055)
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| 摘要: |
| 为研究锈蚀钢筋混凝土（RC）梁抗震性能,对8根RC梁进行人工气候加速腐蚀试验和拟静力加载试验,分析了锈蚀程度和配箍率对RC梁破坏过程、承载能力、变形能力及耗能能力等的影响。在OpenSees中分别采用SFI-MVLEM单元和零长度截面单元模拟梁的弯剪变形和黏结滑移变形,并以承载力和耗能能力最优为原则对模型相关参数进行标定。结果表明:纵筋锈蚀率从0增加到6.8%,试件剪切破坏特征愈加严重,承载力、延性及塑性转动能力分别降低6.7%、5.1%、11.5%；随着配箍率的增加,试件的变形能力、延性和承载力逐渐提高;单位纵筋锈蚀率增量下,梁试件DL-4的峰值荷载、延性系数和塑性转角比相同配箍率试件DL-3分别降低1.48%、1.79%和3.04%；试件DL-8的峰值荷载、延性系数和塑性转角比相同配箍率试件DL-7分别降低1.77%、3.20%和6.97%,表明锈蚀率和配箍率参数存在耦合效应。模拟与试验的承载力误差均值为8.95%,累积耗能能力误差均值为9.82%,表明所提出的数值模型具有较好的准确性,可用于锈蚀RC梁抗震性能评估。 |
| 关键词: 锈蚀 钢筋混凝土梁 销钉刚度系数 数值模型 抗震性能 |
| DOI：10.11918/202312027 |
| 分类号:TU375.4;TU317.1 |
| 文献标识码:A |
| 基金项目:国家重点研发计划(2019YFC1509302)；国家自然科学基金(52278530)；陕西省重点研发计划(2021ZDLSF06-10) |
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| Experimental and numerical simulation methods for seismic performance of RC beams affected by chloride salt erosion |
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HU Weibing,1,2,LUO Yuxin,1,2,BAI Chengyu,1,2,ZHENG Shansuo,1,2
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(1.School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China; 2.Key Lab of Structural Engineering and Earthquake Resistance(Xi′an University of Architecture and Technology), Ministry of Education, Xi′an 710055, China)
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| Abstract: |
| To investigate the seismic performance of reinforced concrete (RC) beams with corroded steel bars, artificial climate accelerated corrosion tests and quasi-static loading tests were conducted on eight RC beams. The influence of corrosion level and stirrup ratio on the failure process, load-carrying capacity, deformation capacity, and energy dissipation capacity of RC beams was analyzed. Additionally, SFI-MVLEM elements and zero length section elements were used in OpenSees to simulate the flexural-shear deformation and bond-slip deformation of the beams. Model parameters were calibrated based on the principles of optimal load-carrying capacity and energy dissipation capacity. The results show that as the corrosion rate of the longitudinal bars increase from 0 to 6.8%, the shear failure characteristics of the specimens become more severe, and the load-carrying capacity, ductility, and plastic rotational capacity decrease by 6.7%, 5.1%, and 11.5% respectively. As the stirrup ratio increases, the deformation capacity, ductility, and load-bearing capacity of the specimen gradually improve. For a unit increase in longitudinal bar corrosion rate, the peak load, ductility coefficient, and plastic rotation angle of specimen DL-4 decrease by 1.48%, 1.79%, and 3.04% respectively compared to specimen DL-3 with the same stirrup ratio. Similarly, for specimen DL-8, the peak load, ductility coefficient, and plastic rotation angle decrease by 1.77%, 3.20%, and 6.97% respectively compared to specimen DL-7 with the same stirrup ratio, indicating a coupling effect between the corrosion rate and stirrup ratio parameters. The average errors in load-carrying capacity and cumulative energy dissipation capacity between simulation and testing are 8.95% and 9.82% respectively, indicating that the proposed numerical model has good accuracy and could be used for assessing the seismic performance of corroded RC beams. |
| Key words: corrosion RC beams dowel action coefficient numerical model seismic performance |
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