摘要
提出了一种螺栓法兰连接可拆卸型钢混凝土柱,为研究其抗震性能和可拆卸性能,利用ABAQUS建立了螺栓法兰连接柱(DSRC柱)和型钢混凝土柱(SRC柱)数值模型。通过低周往复加载,分析了法兰板厚度、螺栓数量、轴压比、柱高比、含钢率对DSRC柱破坏模式和抗震性能的影响,结果表明:法兰板厚度和柱高比对DSRC柱破坏模式和抗震性能的影响较大。主要有2类破坏模式:当柱高比有≤1/2、或≥2/3且法兰板厚度较大时,构件的破坏模式为下柱及其连接破坏或下柱破坏,该类破坏模式的构件滞回曲线饱满,耗能能力较强,延性系数较大;当柱高比≥2/3且法兰板厚度较小时,构件的破坏模式为上柱及其连接破坏或上柱、下柱及其连接破坏,该类破坏模式的构件滞回曲线有捏缩现象,耗能能力较差。以螺栓损伤系数η和法兰板屈服程度w作为DSRC柱的可拆卸指标,并进行了可拆卸性能分析。结果表明:螺栓数量对可拆卸性能影响较大。当螺栓数量足够多且η和w均≤0.2时,可以实现DSRC柱的可拆卸。最后,基于下柱及其连接破坏、下柱破坏2种破坏模式,结合相关规范,提出了DSRC柱螺栓数量和法兰板厚度的设计建议;并结合有限元模型分析结果,对螺栓数量计算公式做出了修正。
In order to study seismic performance and demountable performance of demountable steel reinforced concrete column,the numerical models of demountable steel reinforced concrete(DSRC)column and steel reinforced concrete(SRC)column were established based on ABAQUS.The effects of flange thickness,bolt number,axial compression ratio,column height ratio and steel ratio on the failure mode and seismic performance of DSRC columns were analyzed by low-cycle reciprocating loading.The results show that the failure mode and seismic performance of DSRC columns with different flange thickness and column height ratio can be divided into two main failure modes.When the column height ratio is not more than 1/2,or it is not less than 2/3 and the flange thickness is large,the failure mode of the component is the destruction of the lower column or the destruction of the lower column and its connection.The hysteretic curve is full,the energy dissipation capacity is strong,and the ductility coefficient is large.When the column height ratio is not less than 2/3 and their flange thickness is small,the failure mode of the component is the destruction of the upper column and its connection or the destruction of the upper column and the lower column and its connection.The hysteretic curve is pinched and the energy dissipation capacity is poor.The bolt damage coefficient and flange yield can be used as the demountable indexes of DSRC columns.When both indexes are not more than 0.2,the DSRC column can be demounted.Finally,based on the two failure modes of the destruction of the lower column and the destruction of the lower column and its connection,combined with the relevant standard,the design suggestions of the number of bolts and the thickness of the flange are put forward.Combined with the analysis result of finite element model,the calculation formula of bolt quantity is modified.
作者
门进杰
吴熙
张谦
李家富
霍文武
MEN Jinjie;WU Xi;ZHANG Qian;LI Jiafu;HUO Wenwu(State Key Laboratory of Green Building in Western China,Xi′an University of Architecture&Technology,Xi′an 710055,China;School of Civil Engineering,Xi′an University of Architecture&Technology,Xi′an 710055,China;MCC Capital Engineering&Research Incorporation Limited,Beijing 100176,China;Northwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Xi′an 710075,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2023年第2期56-68,共13页
Earthquake Engineering and Engineering Dynamics
基金
西部绿色建筑国家重点实验室自主研究课题项目(LSZZ202115)
国家重点研发计划国际合作重点专项项目(2019YFE0112900)
国家自然科学基金项目(52178160,51878542)
陕西省教育厅重点科学研究计划项目(21JY023)。
关键词
螺栓法兰连接
型钢混凝土柱
可拆卸性能
抗震性能
设计方法
bolted flange connection
steel reinforced concrete column
demountable performance
seismic performance
design method
