巨型钢框架预应力复合支撑体系性能初探
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摘要
为研究悬挂式巨型钢框架-预应力复合支撑体系的结构性能,基于工程实际,建立该体系的三维空间模型,运用非线性有限元方法对该结构进行了竖载静力分析、风载静力分析、模态分析以及地震动时程分析,结果表明,新型复合支撑有效改善了巨型梁的竖载受力性能;水平荷载作用下体系侧移曲线总体呈弯曲型,层间侧移曲线则呈现周期性变化;体系存在密集模态成组及特征相似模态成对现象;附加阻尼有效降低了体系地震动反应,还有效克服了悬挂端位移太大的问题。
In order to study structural performance of mega-suspended steel frame and composite brace structure with additional damper,based on practical projects,three-dimensional model of the new structure was established,and static analysis under vertical and horizontal load,modal analysis and seismic time-history analysis were presented with finite element method considering geometric nonlinearity.The results indicated that prestressed composite brace can improve mechanical performance of mega beam under vertical static load.The lateral displacement curve of the structure under horizontal wind incurvated.The phenomenon of modal group is evident.Additional damper can effectively decrease the responses induced by earthquake,and the lateral displacement of suspended substructure,as well.
In order to study structural performance of mega-suspended steel frame and composite brace structure with additional damper,based on practical projects,three-dimensional model of the new structure was established,and static analysis under vertical and horizontal load,modal analysis and seismic time-history analysis were presented with finite element method considering geometric nonlinearity.The results indicated that prestressed composite brace can improve mechanical performance of mega beam under vertical static load.The lateral displacement curve of the structure under horizontal wind incurvated.The phenomenon of modal group is evident.Additional damper can effectively decrease the responses induced by earthquake,and the lateral displacement of suspended substructure,as well.
引文
[1]梁启智,张耀华.巨型框架悬挂体系地震反应特性及阻尼控制研究[J].华南理工大学学报,1999,27(1):106-110.
[2]王肇民,邓洪洲,董军.高层巨型框架悬挂结构体系抗震性能研究[J].建筑结构学报,1999,20(1):23-30.
[3]邓志恒,罗延明,覃春跃.巨型框筒-钢子框架结构动力特性的参数影响分析[J].广西大学学报:自然科学版,2008,33(1):5-15.
[4]张耀华,梁启智,付赣清.巨型框架悬挂体系抗震原理及初步设计方法[J].工程力学,2000,17(2):10-17.
[5]马宏.巨型桁架悬挂钢结构体系抗震性能研究[D].南京:南京工业大学土木工程学院,2003.
[6]VAFAI A,ESLELCANCHI H,MUFID M.The use of single diagonal bracing in improvement of the lateral response of tallbuildings[J].Structural Design of Tall Buildings,1995,4:115-126.
[7]KIM J,RYUJ,LANC.Seismic performance of structures connected by viscoelastic dampers[J].Engineering Structures,2006,28:183-195.
[8]LIAN Y D,ZHANG X,SHELDONC.Damping characteristics of friction damped braced frame and its effectiveness in themega-sub controlled structure system[J].Earthquake Engineering and Engineering Vibration,2007,6:171-181.
[9]ZHENG TY.Asimplified modal of braced steel frames in tall building considering second-order effects[C]//Proceedingsof sixth pacific structural steel conference.Beijing:Seismological Press,2001:184-189.
[10]唐柏鉴,阮含婷.附加阻尼装置的悬挂式巨型钢框架支撑体系模态分析[J].江苏科技大学学报,2008,22(4):18-23.
[2]王肇民,邓洪洲,董军.高层巨型框架悬挂结构体系抗震性能研究[J].建筑结构学报,1999,20(1):23-30.
[3]邓志恒,罗延明,覃春跃.巨型框筒-钢子框架结构动力特性的参数影响分析[J].广西大学学报:自然科学版,2008,33(1):5-15.
[4]张耀华,梁启智,付赣清.巨型框架悬挂体系抗震原理及初步设计方法[J].工程力学,2000,17(2):10-17.
[5]马宏.巨型桁架悬挂钢结构体系抗震性能研究[D].南京:南京工业大学土木工程学院,2003.
[6]VAFAI A,ESLELCANCHI H,MUFID M.The use of single diagonal bracing in improvement of the lateral response of tallbuildings[J].Structural Design of Tall Buildings,1995,4:115-126.
[7]KIM J,RYUJ,LANC.Seismic performance of structures connected by viscoelastic dampers[J].Engineering Structures,2006,28:183-195.
[8]LIAN Y D,ZHANG X,SHELDONC.Damping characteristics of friction damped braced frame and its effectiveness in themega-sub controlled structure system[J].Earthquake Engineering and Engineering Vibration,2007,6:171-181.
[9]ZHENG TY.Asimplified modal of braced steel frames in tall building considering second-order effects[C]//Proceedingsof sixth pacific structural steel conference.Beijing:Seismological Press,2001:184-189.
[10]唐柏鉴,阮含婷.附加阻尼装置的悬挂式巨型钢框架支撑体系模态分析[J].江苏科技大学学报,2008,22(4):18-23.
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