摘要
为研究混凝土全装配式框架结构的抗连续倒塌性能,在2个全装配式试件(PC1、PC2)和1个现浇试件(RC)的中柱移除静力试验及动力试验的基础上,利用OpenSees有限元软件建立3个子结构宏模型,将校验结果与试验结果进行了对比,继而设计了2栋7层全装配式框架结构(PC1-Frame、PC2-Frame)和1栋现浇框架结构(RC-Frame),采用拆除构件法拆除框架底层的中柱和边柱,对剩余损伤结构的抗连续倒塌能力进行评估.结果表明,拆除边柱的倒塌危险性较拆除中柱大,PC1-Frame失效点位移时程曲线振幅比RC-Frame大;在拆除中柱后,PC1-Frame和PC2-Frame在压拱机制阶段的极限承载力分别较RC-Frame低30%和20.5%;在拆除边柱后,PC1-Frame和PC2-Frame在压拱机制的极限承载力分别较RC-Frame低26.9%和22.3%.最后校验了基于等能量原理的简化非线性动力分析方法的适用性,并得知结构的动力放大系数在构件进入塑性阶段后逐渐减小.
To study the progressive collapse performance of fully assembled concrete frame structures,based on the static and dynamic tests of two fully assembled specimens(PC1 and PC2)and one cast-in-situ specimen(RC),three sub-structural macro-models were established by using OpenSees finite element software,and the results of model verification were compared with test results.Two seven-story fully assembled frame structures(PC1-Frame,PC2-Frame)and a cast-in-situ frame(RC-Frame)were designed.Progressive collapse analysis was conducted for the residual structure of which middle and exterior column at the bottom were removed by using column removal method,respectively.The results showed that removing exterior columns was more easier to cause collapse than removing middle columns,and the displacement time history curve amplitude of failure point of PC1-Frame was larger than that of RC-Frame;The ultimate bearing capacity of PC1-Frame and PC2-Frame was 30% and 20.5% lower than that of RC-Frame in the case of removing mid-column,26.9% and 22.3% lower in the case of removing exterior-column,respectively.Finally,the validity of the simplified non-linear dynamic analysis method based on the principle of equal energy was verified,and it is found that the dynamic amplification factor decreased with the structure entering the plastic stage.
作者
周云
张琴
胡翔
陈太平
易伟建
ZHOU Yun;ZHANG Qin;HU Xiang;CHEN Taiping;YI Weijian(Hunan Provincial Key Laboratory of Damage Detection,Hunan University,Changsha 410082,China;College of Civil Engineering,Hunan University,Changsha 410082,China;Hunan Provincial Key Laboratory of Green Advanced Civil Engineering Materialsand Application Technology,Hunan University,Changsha 410082,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第5期1-13,共13页
Journal of Hunan University:Natural Sciences
基金
国家重点研发计划专项资助项目(2016YFC0701400)
国家自然科学基金资助项目(51878264)
湖南省交通厅科技进步与创新计划项目(201912)。
关键词
全装配式混凝土结构
结构连续倒塌
有限元宏模型
拆除构件法
静动力校验
fully assembled concrete structures
progressive collapse
finite element macro-model
column removal method
calibration based on static and dynamic tests
