偏心支撑半刚性连接钢框架的时程分析
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摘要
将偏心支撑与半刚性连接钢框架相结合是一种新型抗震结构体系,为探讨其在地震作用下的弹塑性反应和影响因素,采用有限元软件进行了时程分析。结果表明:偏心支撑显著增加了半刚性连接钢框架的抗侧刚度,侧移减小约75%,并大大降低了结构性能对节点转动刚度的敏感性;与无支撑框架相比,有支撑框架对地震作用反应敏感,振动频率增加,底部剪力增大,但层间位移角减小;设置偏心支撑使得半刚性连接框架的屈服位置由柱脚移至耗能梁段,增加了结构的安全性和耗能能力;偏心支撑抗侧体系所承担的剪力不小于底部总剪力的75%。
Semi-rigid steel frame combined with eccentric braces is a new type of seismic structural system.In order to investigate its elasto-plastic behavior and influence factors,time-history analysis is conducted by using finite element method.The results show that eccentric braces increase lateral stiffness of semi-rigid steel frame significantly and that lateral displacement reduces by about 75%.Braces also greatly reduce the sensitivity of structural performance to connection rotational stiffness.Compared with semi-rigid frames without braces,eccentrically braced semi-rigid frames is sensitive to the earthquake,and the vibration frequency and base shear force increases,but story drift angle decreases.Eccentric braces make yield position of semi-rigid frames from column base to link beams.This increases the structure safety and energy dissipation capacity.Shear force undertaken by eccentric braces is not less than 75% of total base shear force.
Semi-rigid steel frame combined with eccentric braces is a new type of seismic structural system.In order to investigate its elasto-plastic behavior and influence factors,time-history analysis is conducted by using finite element method.The results show that eccentric braces increase lateral stiffness of semi-rigid steel frame significantly and that lateral displacement reduces by about 75%.Braces also greatly reduce the sensitivity of structural performance to connection rotational stiffness.Compared with semi-rigid frames without braces,eccentrically braced semi-rigid frames is sensitive to the earthquake,and the vibration frequency and base shear force increases,but story drift angle decreases.Eccentric braces make yield position of semi-rigid frames from column base to link beams.This increases the structure safety and energy dissipation capacity.Shear force undertaken by eccentric braces is not less than 75% of total base shear force.
引文
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[3]Astanesh-Als A.Seismic performance and design of bolted steelmoment resisting frames[J].Engineering Journal,AISC,1999,36(3):105-120.
[4]郭兵,郭彦林,柳锋,等.焊接及螺栓连接钢框架的循环加载试验研究[J].建筑结构学报,2006,27(2):47-56.
[5]郭兵,郭彦林,李光明.半刚接钢框架的动力特性探讨[J].建筑结构,2007,37(10):109-111.
[6]Guo B,Lei S Z,Tang J M.Analysis model and hysteretic behaviorof semi-rigid steel frames[A].Proceedings of 12th InternationalConference on Computing in Civil and Building Engineering&2008 International Conference on Information Technology in Con-struction[C].Beijing,2008(光盘版).
[7]郭兵,雷淑忠.梁柱节点刚度对无支撑钢框架性能的影响[J].山东建筑大学学报,2010,25(3):231-235.
[8]李海丰,郭兵,王翠.新型框架支撑体系的研究[J].山东大学学报,2008,38(S2):153-154.
[9]闫风全,郭兵,刘龙堂.钢结构建筑结构体系抗震性能比较[J].山东大学学报,2008,38(S2):173-176.
[10]田海兰,张超,石艳.偏心支撑半刚接钢框架地震作用下的侧移分析[J].济南大学学报,2010,24(S1):64-66.
[11]石艳,郭兵,田海兰.偏心支撑半刚接钢框架的模态分析[J].建筑结构,2010,40(S1):187-190.
[12]郭兵,顾强.多层钢框架中梁柱端板连接的强度和刚度[J].建筑结构学报,2004,25(2):27-31.
[2]Elnashai A S,Elghazouli A Y,Denesh-Ashtiani F A.Response ofsemi-rigid steel frames to cyclic and earthquake loads[J].Journalof Structural Engineering,ASCE,1998,124(8):857-867.
[3]Astanesh-Als A.Seismic performance and design of bolted steelmoment resisting frames[J].Engineering Journal,AISC,1999,36(3):105-120.
[4]郭兵,郭彦林,柳锋,等.焊接及螺栓连接钢框架的循环加载试验研究[J].建筑结构学报,2006,27(2):47-56.
[5]郭兵,郭彦林,李光明.半刚接钢框架的动力特性探讨[J].建筑结构,2007,37(10):109-111.
[6]Guo B,Lei S Z,Tang J M.Analysis model and hysteretic behaviorof semi-rigid steel frames[A].Proceedings of 12th InternationalConference on Computing in Civil and Building Engineering&2008 International Conference on Information Technology in Con-struction[C].Beijing,2008(光盘版).
[7]郭兵,雷淑忠.梁柱节点刚度对无支撑钢框架性能的影响[J].山东建筑大学学报,2010,25(3):231-235.
[8]李海丰,郭兵,王翠.新型框架支撑体系的研究[J].山东大学学报,2008,38(S2):153-154.
[9]闫风全,郭兵,刘龙堂.钢结构建筑结构体系抗震性能比较[J].山东大学学报,2008,38(S2):173-176.
[10]田海兰,张超,石艳.偏心支撑半刚接钢框架地震作用下的侧移分析[J].济南大学学报,2010,24(S1):64-66.
[11]石艳,郭兵,田海兰.偏心支撑半刚接钢框架的模态分析[J].建筑结构,2010,40(S1):187-190.
[12]郭兵,顾强.多层钢框架中梁柱端板连接的强度和刚度[J].建筑结构学报,2004,25(2):27-31.
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