摘要
为了更好地了解钢筋混凝土框架结构的地震损伤倒塌行为,本文探讨了混凝土框架结构的倒塌机制,并分别对某3层和9层框架结构进行了地震损伤数值模拟,研究了近断层强震下的结构响应行为和倒塌破坏演化模式,同时给出了相应的抗倒塌设计建议。结果表明:近断层速度脉冲型地震动对楼层低的结构的破坏影响与非速度脉冲的大致相同;但对楼层较高的结构,影响差别较大。对于低层的混凝土框架结构,构件出现的塑性铰后,能沿结构高度均匀发展;但对于较高层的框架结构,其塑性铰的发展不充分,使得结构构件无法充分发挥其抗震性能;且含有速度脉冲和不含速度脉冲引起的结构塑性铰发展的顺序也不同。
With the purpose of better understanding the behaviors of reinforced concrete frame structures suffered with near-fault ground motions,the collapse mechanism of the structure was discussed in the paper.Moreover,numerical simulations of seismic damage were performed for a 3-story and 9-story frame structure.The structural response behavior and collapse failure evolution model under near-fault strong earthquakes were studied.In addition,the corresponding collapse-resistant design proposal was given.The results show that the damage effect on the low floor structure is nearly the same when suffered with the near-fault velocity pulse or the non-velocity pulse ground motion.However,for the higher-level frame structure,the development of its plastic hinge is not sufficient,making the structural member unable to fully exert its anti-seismic performance.Forthermore,the order of development of structural plastic hinges that are caused by velocity pulses and without velocity pulses is also different.
作者
张莹
孙广俊
李鸿晶
ZHANG Ying;SUN Guangjun;LI Hongjing(HuaTian Engineering and Technology Corporation,MCC,Nanjing 210019,China;College of Civil Engineering,Nanjing University of Technology,Nanjing 211816,China)
出处
《建筑结构》
CSCD
北大核心
2020年第S01期491-494,共4页
Building Structure
关键词
框架结构
近断层
地震损伤
倒塌
速度脉冲
frame structure
near-fault
seismic damage
collapse
velocity pulse
