预应力技术在钢结构抗侧体系中的创新与研究
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摘要
预应力技术具有很强的创新潜力,目前预应力技术已广泛应用于横向结构体系,但在竖向抗侧体系中的研究和应用较少.文中介绍了几种预应力技术在钢结构抗侧体系中的应用.着重介绍巨型钢框架-预应力复合支撑体系,该体系中刚性支撑与预应力拉索组合形成封闭、自平衡的复合支撑系统;对其进行三维有限元模型数值分析,包括竖载、水平风载静力分析及地震动时程分析,结果表明复合支撑有效增加了巨型框架的抗侧刚度,缓解了巨型桁架节点、构件受力集中现象.同时介绍了预应力巨型支撑-钢框架结构、预应力门式刚架及预应力梁柱连接.
The prestress technology has strong innovation potential for structures.At present,it has been researched and applied widely in span structures.However,research work for vertical lateral system is few.This paper introduced several steel structures and nodes with the prestress technology,which were all original.It focused on the mega steel frame with composite brace,in which the composite brace was combined with the rigid splayed lattice brace and the flexible prestress cable.The composite brace was self-balancing.Furthermore,this paper established a 3D model of the new mega structure with suspended sub structure,and analyzed its mechanical performance under the vertical static load,the horizontal wind and dynamic time-history with nonlinear finite element method.The results indicate that the self-balancing composite brace can effectively mitigate the stress concentration in mega columns,mega beams and nodes,as well as enhance the lateral stiffness of the mega frame.The prestressed-mega-brace-frame structure,the prestressed portal frame and the prestressed connection were introduced too.
The prestress technology has strong innovation potential for structures.At present,it has been researched and applied widely in span structures.However,research work for vertical lateral system is few.This paper introduced several steel structures and nodes with the prestress technology,which were all original.It focused on the mega steel frame with composite brace,in which the composite brace was combined with the rigid splayed lattice brace and the flexible prestress cable.The composite brace was self-balancing.Furthermore,this paper established a 3D model of the new mega structure with suspended sub structure,and analyzed its mechanical performance under the vertical static load,the horizontal wind and dynamic time-history with nonlinear finite element method.The results indicate that the self-balancing composite brace can effectively mitigate the stress concentration in mega columns,mega beams and nodes,as well as enhance the lateral stiffness of the mega frame.The prestressed-mega-brace-frame structure,the prestressed portal frame and the prestressed connection were introduced too.
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:自然科学版,1999,27(1):106-110.Liang Qizhi,Zhang Yaohua.Research on seismic perform-ance and damper control of mega-frame-suspended structure[J].Journal of South China University of Technology:Natural Science Edition,1999,27(1):106-110.(in Chi-nese)
[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.Wang Zhaomin,Deng Hongzhou,Dong Jun.Research onanti-seismic performance of mega-frame-suspended struc-ture[J].Journal ofBuilding Structure,1999,20(1):23-30.(in Chinese)
[3]邓志恒,秦荣.巨型框筒部分悬挂结构控制体系地震反应特性及阻尼控制研究[J].地震工程与工程振动,2002,22(4):133-138.Deng Zhiheng,Qin Rong.Research on seismic performanceand damper control of mega-frame-tube-suspended structure[J].Seismic Engineering and Engineering Vibration,2002,22(4):133-138.(in Chinese)
[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.Zhang Yaohua,Liang Qizhi,Fu Ganqing.Aseismic princi-ple and primary design method of mega-frame-suspendedstructure[J].Engineering Mechanics,2000,17(2):10-17.(in Chinese)
[5]马宏.巨型桁架悬挂钢结构体系抗震性能研究[D]:江苏南京:南京工业大学,2003:63-74.
[6]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:自然科学版,2008,22(4):18-23.Tang Baijian,Ruan Hanting.Modal analysis of mega-frame-brace-suspended structure with damper[J].JournalofJiangsu UniversityofScience andTechnology:Natural Sc-inece Edition,2008,22(4):18-23.(in Chinese)
[7]Vafai A,Eslelcanchi H,Mufid M.The use of single diago-nal bracing in improvement of the lateral response of tallbuildings[J].Structural Design ofTall Buildings,1995(4):115-126.
[8]Kim J,Ryu J,Chung L.Seismic performance of structuresconnected by viscoelastic dampers[J].Engineering Struc-tures,2006,28:183-195.
[9]Lian Yeda,Zhang Xunan,Sheldon Cherry.Damping char-acteristics of friction damped braced frame and its effective-ness in the mega-sub controlled structure system[J].Earthquake Engineering and Engineering Vibration,2007,6:171-181.
[10]Sarno LD,Elnashai AS.Bracing systems for seismic ret-rofitting of steel frames[J].Journal of ConstructionalSteel Research,2009,65:452-465.
[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.Wang Zhaomin,Deng Hongzhou,Dong Jun.Research onanti-seismic performance of mega-frame-suspended struc-ture[J].Journal ofBuilding Structure,1999,20(1):23-30.(in Chinese)
[3]邓志恒,秦荣.巨型框筒部分悬挂结构控制体系地震反应特性及阻尼控制研究[J].地震工程与工程振动,2002,22(4):133-138.Deng Zhiheng,Qin Rong.Research on seismic performanceand damper control of mega-frame-tube-suspended structure[J].Seismic Engineering and Engineering Vibration,2002,22(4):133-138.(in Chinese)
[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.Zhang Yaohua,Liang Qizhi,Fu Ganqing.Aseismic princi-ple and primary design method of mega-frame-suspendedstructure[J].Engineering Mechanics,2000,17(2):10-17.(in Chinese)
[5]马宏.巨型桁架悬挂钢结构体系抗震性能研究[D]:江苏南京:南京工业大学,2003:63-74.
[6]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:自然科学版,2008,22(4):18-23.Tang Baijian,Ruan Hanting.Modal analysis of mega-frame-brace-suspended structure with damper[J].JournalofJiangsu UniversityofScience andTechnology:Natural Sc-inece Edition,2008,22(4):18-23.(in Chinese)
[7]Vafai A,Eslelcanchi H,Mufid M.The use of single diago-nal bracing in improvement of the lateral response of tallbuildings[J].Structural Design ofTall Buildings,1995(4):115-126.
[8]Kim J,Ryu J,Chung L.Seismic performance of structuresconnected by viscoelastic dampers[J].Engineering Struc-tures,2006,28:183-195.
[9]Lian Yeda,Zhang Xunan,Sheldon Cherry.Damping char-acteristics of friction damped braced frame and its effective-ness in the mega-sub controlled structure system[J].Earthquake Engineering and Engineering Vibration,2007,6:171-181.
[10]Sarno LD,Elnashai AS.Bracing systems for seismic ret-rofitting of steel frames[J].Journal of ConstructionalSteel Research,2009,65:452-465.
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