酸雨环境下钢筋混凝土框架节点抗震性能试验研究
Experimental Study of Seismic Behavior of RC Frame Joints Under Acid Rain Environment
投稿时间:2021-05-24  修订日期:2021-09-14
DOI:
中文关键词:  酸雨环境  RC框架节点  拟静力试验  滞回性能  剪切性能  损伤演化
英文关键词:acid rain environment  RC frame joints  quasi-static test  hysteretic behavior  shear performance  damage evolution
基金项目:国家重点研发计划课题(2019YFC1509302); 陕西省重点研发计划项目(2021ZDLSF06-10) ; 西安市科技计划项目(2019113813CXSF016SF026)
作者单位邮编
尚志刚 西安建筑科技大学 710055
郑山锁 西安建筑科技大学 710055
郑淏 火箭军工程大学 
姜叶子 中国启源工程设计研究院有限公司 
贺钧 中国启源工程设计研究院有限公司 
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中文摘要:
      为研究酸雨腐蚀后RC框架节点的抗震性能,采用人工气候法模拟酸雨环境,对8榀RC梁柱节点组合体试件进行加速腐蚀试验,而后进行拟静力试验,观察酸雨腐蚀后试件表观现象,并分析腐蚀循环次数、轴压比及硫酸根离子浓度对节点组合体与核心区破坏特征、滞回性能、剪切性能等的影响。在此基础上,引入损伤指数,并确定损伤模型参数取值,进而定量化揭示组合体试件在加载过程中的损伤演化规律。试验与分析结果表明:酸雨腐蚀会使试件发生骨料外露、结晶析出、蚀洞形成等现象,并随腐蚀循环次数与硫酸根离子浓度的增大,该腐蚀现象愈加严重;腐蚀对试件裂缝发展过程有较为明显影响,但未能改变设计破坏形态;随着腐蚀循环次数与硫酸根离子浓度的增加,试件梁端弯曲裂缝与核心区剪切裂缝出现较早且发展较快,组合体强度、刚度、延性、耗能及核心区剪力与剪切变形均逐渐减小,而剪切占比与损伤发展速率则不断变大;具有较大轴压比的试件,其核心区剪切裂缝出现较晚且发展较慢,组合体承载能力、损伤发展速率及核心区剪力与剪切占比相对较大,但变形能力与耗能能力较差,核心区剪切变形亦较小。
英文摘要:
      To study the seismic behavior of reinforced concrete(RC) frame joints affected by acid rain corrosion, the artificial climate method was used to simulate acid rain environment. The accelerated corrosion tests were conducted on eight RC beam-column joint specimens, and then quasi-static tests were carried out. The apparent phenomenon of the specimens corroded by acid rain was observed. The influence of corrosion cycles, axial compression ratio and sulfate ion concentration on the failure characteristics, hysteretic behavior and shear performance of the RC frame beam-column joints were analyzed. On this basis, the damage index was introduced, and the parameters of damage model were determined, then the damage evolution of the specimens during the loading process was revealed quantitatively. The results of test and analysis show that, aggregate exposure, crystal precipitation and eroded holes appear on the specimens due to acid rain corrosion, and the corrosion phenomenon becomes more serious with the increase of corrosion cycles and sulfate ion concentration. Corrosion has an obvious influence on the crack development of the specimen, while it can not change the design failure pattern. With the increase of corrosion cycles and sulfate ion concentration, the bending cracks at the beam and the shear cracks at the core area appeare earlier and develop rapidly, and the strength, stiffness, ductility, energy dissipation, shear force and shear deformation decreased gradually, while the shear proportion and damage development rate increase. For the specimen with a larger axial compression ratio, the shear cracks at the core area appear late and develop slowly, and the bearing capacity, damage development rate, shear force and shear proportion are relatively large, while the deformation capacity and energy dissipation capacity are poor, and the shear deformation is also small.
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