摘要
钢筋混凝土结构在使用过程中由于钢筋锈蚀抗震性能退化。为了研究钢筋混凝土框架结构在正常使用环境下随使用时间的增加其抗震性能的退化规律,采用通用有限元分析软件ABAQUS对锈蚀钢筋混凝土框架进行多尺度建模以提高计算精度并保证计算效率。基于锈蚀钢筋混凝土构件及单榀框架的试验数据,验证了多尺度建模方法的正确性。采用多尺度模型对4层钢筋混凝土框架结构进行了静力推覆分析及弹塑性时程分析,对比不同使用时间的钢筋混凝土框架结构的地震反应和损伤情况。结果表明:当使用时间为25 a时,结构的抗震性能与新建结构接近;当使用时间超过50 a时,随着使用时间的增加,结构的承载能力及刚度退化明显,在地震作用下的位移响应逐渐增大,地震损伤范围不断扩大;相比新建结构,当使用时间为50、75 a和100 a时,结构的抗侧承载力分别降低了6.2%、14.1%及18.1%,罕遇地震作用下的最大层间位移角分别增大了9.2%、19.8%及25.1%。
Due to corrosion of steel reinforcement, the seismic performance of reinforced concrete(RC) structures degrades during service time. A numerical analysis was conducted to investigate the time-dependent degradation law of seismic performance of RC structures in normal environment. In order to improve the computation efficiency and guarantee the calculation accuracy, multi-scale modeling technique with the aid of general finite element analysis software ABAQUS was adopted for corroded reinforced concrete(RC) moment-resisting frame structures. Based on the test data of corroded RC components and single-bay RC frames, the multi-scale modeling technique was validated. Nonlinear pushover analysis and time-history analysis were carried out on multi-scale models of four-story RC moment-resisting frames to investigate the seismic response and damage distribution of RC frames with different service time. It is indicated that for the RC frames with a service time of 25 a, the seismic performance is similar to that of the new structure. For RC frames with service time longer than 50 a, an increase of service time leads to significant degradation of the loading resistance and stiffness, and the displacement response and damage extent under seismic excitation increase gradually. Comparing with a new RC frame structure, the structures with service times of 50 a, 75 a and 100 a exhibit decreases in the lateral loading-carrying capacity by 6.2%, 14.1% and 18.1%, respectively. The maximum inter-story drift ratio under rare earthquakes is increased by 9.2%, 19.8% and 25.1%, respectively.
作者
刘小娟
蒋欢军
LIU Xiaojuan;JIANG Huanjun(College of Civil Engineering,Huaqiao University,Xiamen 361021,China;Key Laboratory for Structure Engineering and Disaster Prevention of Fujian Province,Huaqiao University,Xiamen 361021,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2019年第3期134-141,共8页
Journal of Building Structures
基金
国家重点研发计划(2017YFC1500701)
福建省自然科学基金项目(2018J01073)
福建省中青年教师教育科研项目(JAT170047)
关键词
锈蚀钢筋混凝土框架
多尺度建模方法
静力推覆分析
弹塑性时程分析
抗震性能
corroded reinforced concrete frame
multi-scale modeling technique
pushover analysis
time-history analysis
seismic performance
