屈曲约束支撑核心单元的多波屈曲过程研究
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摘要
屈曲约束支撑核心单元的受力形态是影响其低周疲劳特性和滞回特性的重要因素。基于屈曲约束支撑核心单元的受力特点,建立了基本假定,并依据承受轴向荷载和侧向荷载杆件的平衡方程,推导了核心单元与约束单元点接触和线接触状态下的挠曲线方程,揭示了其在持续增大的轴向力作用下点接触、线接触和新波生成交替出现的多波屈曲过程。算例分析表明:该文提出的计算公式与数值分析计算结果相一致,可用以描述核心单元在约束单元内的受力特性。
The structural behavior of the core component is one of the key factors that influence the low-cycle fatigue and hysteretic character of buckling-restrained brace(BRB).Based on the structural features of the BRB,some basic assumptions are introduced to establish the equilibrium equation of a member subjected to axial and lateral force.Equations are then derived to describe the deflection curve of the core component under the situation of point contact and line contact.The multi-wave buckling process of the core under increasing axial load in turn of point contact,line contact and generation of new wave is revealed.A calculation example illustrates that the derived equations agree well with the numerical results,and the equations can be used to describe the structural behavior of the BRB core.
The structural behavior of the core component is one of the key factors that influence the low-cycle fatigue and hysteretic character of buckling-restrained brace(BRB).Based on the structural features of the BRB,some basic assumptions are introduced to establish the equilibrium equation of a member subjected to axial and lateral force.Equations are then derived to describe the deflection curve of the core component under the situation of point contact and line contact.The multi-wave buckling process of the core under increasing axial load in turn of point contact,line contact and generation of new wave is revealed.A calculation example illustrates that the derived equations agree well with the numerical results,and the equations can be used to describe the structural behavior of the BRB core.
引文
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[11]申波,邓长根.双钢管构件由点接触到线接触的连续过渡[J].工程力学,2007,24(2):154―160.Shen Bo,Deng Changgen.Continuous transition frompoint contact to line contact between the axiallycompressed inner core and the flexible sleeve in asleeved column[J].Engineering Mechanics,2007,24(2):154―160.(in Chinese)
[12]申波,邓长根.柔性套管约束下轴心受压杆件的屈曲分析[J].力学与实践,2006,28(5):43―46.Shen Bo,Deng Changgen.Buckling analysis of anaxially compressed strut constrained by a flexible sleeve[J].Mechanics in Engineering,2006,28(5):43―46.(inChinese)
[2]马宁,吴斌,赵俊贤,等.十字形内芯全钢防屈曲支撑构件及子系统足尺试验[J].土木工程学报,2010,43(4):1―7.Ma Ning,Wu Bin,Zhao Junxian,et al.Full scaleuniaxial and subassemblage tests on the seismic behaviorof all-steel buckling-resistant brace[J].China CivilEngineering Journal,2010,43(4):1―7.(in Chinese)
[3]郭彦林,江磊鑫.双矩管带肋约束型装配式防屈曲支撑的设计方法[J].建筑科学与工程学报,2010,27(2):67―74.Guo Yanlin,Jiang Leixin.Design method of buckling-restrained braces assembled with dual ribbed rectangularhollow[J].Journal of Architecture and Civil Engineering,2010,27(2):67―74.(in Chinese)
[4]赵俊贤,吴斌.防屈曲支撑的工作机理及稳定性设计方法[J].地震工程与工程振动,2009,29(3):131―139.Zhao Junxian,Wu Bin.Working mechanism and stabilitydesign methods of buckling-restrained braces[J].Journalof Earthquake Engineering and Engineering Vibration,2009,29(3):131―139.(in Chinese)
[5]郭英涛,任文敏.关于限制失稳的研究进展[J].力学进展,2004,34(1):41―52.Guo Yingtao,Ren Wenmin.Some advances in confinedbuckling[J].Advances in Mechanics,2004,34(1):41―52.(in Chinese)
[6]Sridhara B N.Sleeved compression member[P].USA:5175972,1993.
[7]Prasad B K.Experimental investigation of sleevedcolumn[C].Proceedings of the 33rd AIAA/ASCEStructures,Structural Dynamics and materialsConference,Dallas,USA:AIAA/ASCE,1992:991―999.
[8]Domokos G,Holmes P,Royce B.Constrained Eulerbuckling[J].Journal of Nonlinear Science,1997,7(3):281―314.
[9]哈敏强.无粘结钢支撑性能研究及其应用[D].上海:同济大学,2004.Ha Minqiang.Study on the mechanical performances andapplications of conventional and innovative bucklingrestrained braces[D].Shanghai:Tongji University,2004.(in Chinese)
[10]Chai H.The post-bucking response of a bi-laterallyconstrained column[J].Journal of the Mechanics andPhysics of Solids,1998,46(7):1151―1181.
[11]申波,邓长根.双钢管构件由点接触到线接触的连续过渡[J].工程力学,2007,24(2):154―160.Shen Bo,Deng Changgen.Continuous transition frompoint contact to line contact between the axiallycompressed inner core and the flexible sleeve in asleeved column[J].Engineering Mechanics,2007,24(2):154―160.(in Chinese)
[12]申波,邓长根.柔性套管约束下轴心受压杆件的屈曲分析[J].力学与实践,2006,28(5):43―46.Shen Bo,Deng Changgen.Buckling analysis of anaxially compressed strut constrained by a flexible sleeve[J].Mechanics in Engineering,2006,28(5):43―46.(inChinese)
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