周炎, 郑山锁, 龙立, 张艺欣, 贺金川, 董立国. 氯离子侵蚀下RC框架结构时变抗震性能研究[J]. 工程力学, 2020, 37(7): 214-222. DOI: 10.6052/j.issn.1000-4750.2019.09.0519
引用本文: 周炎, 郑山锁, 龙立, 张艺欣, 贺金川, 董立国. 氯离子侵蚀下RC框架结构时变抗震性能研究[J]. 工程力学, 2020, 37(7): 214-222. DOI: 10.6052/j.issn.1000-4750.2019.09.0519
ZHOU Yan, ZHENG Shan-suo, LONG Li, ZHANG Yi-xin, HE Jin-chuan, DONG Li-guo. STUDY ON SEISMIC PERFORMANCE OF MULTI-AGE RC FRAME STRUCTURES UNDER CHLORIDE ION ATTACK[J]. Engineering Mechanics, 2020, 37(7): 214-222. DOI: 10.6052/j.issn.1000-4750.2019.09.0519
Citation: ZHOU Yan, ZHENG Shan-suo, LONG Li, ZHANG Yi-xin, HE Jin-chuan, DONG Li-guo. STUDY ON SEISMIC PERFORMANCE OF MULTI-AGE RC FRAME STRUCTURES UNDER CHLORIDE ION ATTACK[J]. Engineering Mechanics, 2020, 37(7): 214-222. DOI: 10.6052/j.issn.1000-4750.2019.09.0519

氯离子侵蚀下RC框架结构时变抗震性能研究

STUDY ON SEISMIC PERFORMANCE OF MULTI-AGE RC FRAME STRUCTURES UNDER CHLORIDE ION ATTACK

  • 摘要: 氯离子侵蚀作用引发的结构耐久性损伤将导致RC结构抗震性能发生时变劣化。在材料层次,该文通过考虑钢筋截面削弱、保护层混凝土开裂软化、核心区混凝土极限压应变降低等模拟氯离子侵蚀对RC框架结构材料性能的影响,并基于试验数据验证了模拟方法的准确性;在结构层次,基于上述材料力学性能退化模型和纤维模型,对3层、6层与8层多不同服役期(0年、30年、50年和70年)RC框架结构进行数值建模,继而进行了静力与动力弹塑性分析,研究了其随服役期增长承载与变形能力退化规律和层间位移角分布变化规律。研究结果表明:结构腐蚀后,随着服役期的增加,结构承载力、特征点位移、位移延性、软化段刚度等抗震性能指标均逐渐减小,结构的屈服PGA和倒塌PGA亦不断降低,结构最大层间位移角不断增大,且结构在罕遇地震作用下层间位移反应受服役期影响较设防地震作用更为明显。

     

    Abstract: Chloride ion ingressing into concrete will cause durability problems and eventually lead to the degradation of structural seismic performance within time. At material level, this paper simulates the influence of chloride ion erosion on the properties of RC frame structure materials by considering the weakening of area of reinforcement, the softening of the cover concrete, and the ultimate strain reduction of confined concrete, etc., which was verified by relevant experiment data. At structure level, based on the mechanical properties degradation model of above materials and fiber, the pushover analysis of RC frames of three, six and eight layers (0, 30, 50 and 70 years) and the dynamic time history analysis of the six-layer multi-age frame were carried out, and then the degradation of bearing and deformation capacity and the variation of interstory drift ratio are studied. The results show that: after structural corrosion, with the increasing of service age, the yield displacement, ultimate displacement, failure displacement, ductility and softening stiffness are gradually reduced, and the yield PGA and collapsed PGA of the structure are also decreasing, while the maximum interstory drift ratio of the structure is increasing. Moreover, the interstory drift ratio of the structure under strong earthquakes is more sensitive to the service age than moderate earthquake.

     

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