建筑结构

2017, v.47(S1) 766-771

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钢框架-中心支撑结构强度折减系数谱研究
Strength reduction factor spectrum of the steel concentrically braced frames

马琳琳;李钢;董志骞;杨树标;
Ma Linlin;Li Gang;Dong Zhiqian;Yang Shubiao;College of Civil Engineering,Hebei University of Engineering;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology;

摘要(Abstract):

钢框架-中心支撑结构体系具有良好的初始抗侧刚度,支撑失效后,框架作为储备体系可以继续承担侧向荷载,合理的抗震设计对于结构的经济性和安全性具有重要意义。储备体系直接影响钢框架-中心支撑结构体系的抗倒塌能力,在对钢框架-中心支撑结构体系的强度折减系数研究时,有必要考虑储备能力的作用。本文以单自由度钢框架-中心支撑体系为基础,利用动力时程分析方法,分析了延性、储备系数、阻尼比对结构强度折减系数的影响。结果表明:强度折减系数的取值随延性的提高而显著增大,低延性结构应考虑刚度储备对强度折减系数的影响,延性反应较大的中长周期结构应考虑强度储备的影响。最终给出了考虑储备系数的钢框架-中心支撑结构R-μ-T模型,对该类结构的设计提供重要参考。
The steel concentrically braced frames(CBFs) are considered as effective structures which provide efficient lateral stiffness and strength.As reserve system,frame can undertake lateral load after brace fracture.It is significant to ensure structural safety and cost economy with a reasonable strength design.Reserve system directly effects the collapse resistance of concentrically braced structures,on the concentrically braced steel structural system of the strength reduction factor research,it is necessary to consider the role of reserve capacity.The influence of the ductility,reserve coefficient and damping ration were investigated for the strength reduction factor of the CBF.It is indicated that the strength reduction factor values increase significantly with the increase of ductility.Stiffness reserve capacity has an obvious influence for structures with low ductility.The larger ductility of middle long period structures should consider the influence of the strength reserve capacity.Finally,the R-μ-T model of the CBFs was established,which provide a basis for the strengthbased design of steel CBFs.

关键词(KeyWords): 钢框架-中心支撑结构;强度折减系数;储备系数;延性
steel concentrically braced frames;strength reduction factors;reserve coefficient;ductility

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基金项目(Foundation): 新世纪优秀人才支持计划(NCET-13-0074);; 国家自然科学基金优秀青年基金项目(51422802);; 中央高校基本科研业务费专项资金(DUT14YQ204)

作者(Author): 马琳琳;李钢;董志骞;杨树标;
Ma Linlin;Li Gang;Dong Zhiqian;Yang Shubiao;College of Civil Engineering,Hebei University of Engineering;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology;

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