多层钢筋混凝土框架结构“加层减震”能量时程分析
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摘要
结合一幢多层框架结构应用铅芯叠层橡胶支座(LRB)进行加层改造的工程实例,在对隔震层的抗侧刚度和阻尼比基于能量准则进行优化的基础上,利用Matlab语言编制了能量时程分析程序,考虑地震动三要素和铅芯隔震支座动力特性(屈服位移和第二刚度系数)等影响因素,分析典型地震动作用下设置上述隔震元件LRB加层结构的能量输入、转化及耗散特性.分析结果表明,输入到结构的总能量较加层前有不同程度的增加,但是大部分都由隔震层来吸收和耗散,使得输入到原主体结构的能量较加层前大大降低,减震效果较为明显,证明提出的基于能量的优化准则的合理性与有效性.
A program is developed with MATLAB language to conduct time-energy history analysis,according to the optimization results of lateral rigidness and damping ratio of isolation layer based on the energy criterion proposed by the authors,combining with an adding-storey project of a multi-storey RC frame structure using lead laminated rubber bearings(LRB).The characteristics of energy input,energy conversion and energy dissipation are analyzed under some typical earthquake ground motions considering the three essential elements of ground motion and the dynamic characteristics of LRB.The results show that,the total energy input into the structure increases at different degree compared to that of previous adding-storey,but most of the input energy is dissipated by the isolation layer,so the energy dissipated by the original structure reduces remarkably compared to that of previous adding-storey.The obvious effect of seismic reduction proves the feasibility and rationality of energy-based optimization criterion.
A program is developed with MATLAB language to conduct time-energy history analysis,according to the optimization results of lateral rigidness and damping ratio of isolation layer based on the energy criterion proposed by the authors,combining with an adding-storey project of a multi-storey RC frame structure using lead laminated rubber bearings(LRB).The characteristics of energy input,energy conversion and energy dissipation are analyzed under some typical earthquake ground motions considering the three essential elements of ground motion and the dynamic characteristics of LRB.The results show that,the total energy input into the structure increases at different degree compared to that of previous adding-storey,but most of the input energy is dissipated by the isolation layer,so the energy dissipated by the original structure reduces remarkably compared to that of previous adding-storey.The obvious effect of seismic reduction proves the feasibility and rationality of energy-based optimization criterion.
引文
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[14]周云,周福霖.耗能减震体系的能量设计方法[J].世界地震工程,1997,13(4):8-13.
[15]程光煜,叶列平.弹性多自由度系统地震输入能量的研究[J].工程抗震与加固改造,2006,28(4):6-9.
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[17]周云.粘弹性阻尼减震结构设计[M].武汉:武汉理工大学出版社,2006.132-153.
[18]北村春幸(日).裴星洙,等译.基于性能设计的建筑振动解析[M].西安:西安交通大学出版社,2004.160-183.
[2]谢军龙,周福霖.多层房屋结构TMD“加层减震”试验研究和应用[J].世界地震工程,1998,14(4):57-60.
[3]牛金龙,施卫星.房屋建筑顶层采用隔震支承的消能减震[J].建筑结构,2002,32(6):63-65.
[4]施卫星,王群.地震区既有建筑物增层中的结构控制方法[J].结构工程师,1996,(4):37-42.
[5]Roberto Villaverde.Aseismic roof isolation system:feasibility study with 13-story building.Journal of Structural Engineering[J].2002,(2):188-196.
[6]钱国桢、池毓蔚.地震波激励下加层结构被动控制最优参数求解[J].工程抗震,1998,(3):36-38.
[7]罗小华,程超.TMD原理应用在框架房屋结构加层减震时最优参数值的探讨[J].四川建筑科学研究,2000,26(2):20-22.
[8]李春祥,熊学玉.加层结构中TMD减震优化设计方法[J].工业建筑,1999,29(3):27-29.
[9]郑国琛,祁皑,阎维明.加层减震结构振动台试验分析[J].地震工程与工程振动,2007,27(2):164-170.
[10]周云,徐彤,周福霖.抗震与减震结构的能量分析方法研究与应用[J].地震工程与工程振动,1999,19(4):133-139.
[11]魏新磊,周云,等.基于结构能量分析的抗震设计新方法的研究[J].世界地震工程,2003,19(3):62-67.
[12]W.-L.He and A.K.Agrawal.Energy transfer approach for the design of passive energy dissipation systems[C].15thASCE EngineeringMechanics Conference.NewYork,NY,Columbia University:2000.2-5.
[13]Bertero and C M.Uang.Issues and future directions in the use of an energy approach for seismic-resistant of structures[C].Workshopon Nonlinear Seismic Analysis of Reinforced Concrete Buildings,Slovenia,Yugoslavia,1992.13-16.
[14]周云,周福霖.耗能减震体系的能量设计方法[J].世界地震工程,1997,13(4):8-13.
[15]程光煜,叶列平.弹性多自由度系统地震输入能量的研究[J].工程抗震与加固改造,2006,28(4):6-9.
[16]刘礼君.基于能量的轻钢加层“TMD减震”参数优化研究[D].南昌:华东交通大学,2008.
[17]周云.粘弹性阻尼减震结构设计[M].武汉:武汉理工大学出版社,2006.132-153.
[18]北村春幸(日).裴星洙,等译.基于性能设计的建筑振动解析[M].西安:西安交通大学出版社,2004.160-183.
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