大悬挑屋盖结构的风振控制设计方法
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摘要
分析了风振条件下大跨度屋盖结构中悬挑竖向位移的控制方法,指出传统的模态应变能法因忽略阻尼器的耗能刚度部分可能产生较大误差,并对此给出了修正方法。推导了附加消能支撑的竖向控制力、等效刚度和等效耗能因子公式。根据上述方法和公式,对一大悬挑屋盖结构进行了风振控制设计。经实例应用说明,笔者提出的风振控制设计方法方便实用。
The vertical displacement response of large cantilevered roof structure,which is sensitive to wind load,is easy to exceed the code prescript.For mitigating wind-induced vibration and improving structure vibration behavior,the viscoelastic dampers are a good choice to control the response of the large cantilevered roof structure.On the procedure of vibration control design,model strain energy method is pivotal to get design parameters.When the material loss factor is high,traditional modal strain energy method may produce relative great error.A revised modal strain energy method is presented to improve the analysis accuracy.The calculation formula of vertical control force,the equivalent stiffness and the equivalent loss factor of energy dissipation brace are introduced.With the guide of design procedure,the wind-induced vibration control design for a large cantilevered steel roof structure is given.The design procedure of wind-induced vibration control for large cantilevered steel roof structure is very convenient and practical for structure engineers.
The vertical displacement response of large cantilevered roof structure,which is sensitive to wind load,is easy to exceed the code prescript.For mitigating wind-induced vibration and improving structure vibration behavior,the viscoelastic dampers are a good choice to control the response of the large cantilevered roof structure.On the procedure of vibration control design,model strain energy method is pivotal to get design parameters.When the material loss factor is high,traditional modal strain energy method may produce relative great error.A revised modal strain energy method is presented to improve the analysis accuracy.The calculation formula of vertical control force,the equivalent stiffness and the equivalent loss factor of energy dissipation brace are introduced.With the guide of design procedure,the wind-induced vibration control design for a large cantilevered steel roof structure is given.The design procedure of wind-induced vibration control for large cantilevered steel roof structure is very convenient and practical for structure engineers.
引文
[1]范峰,沈世钊.网壳结构的粘滞阻尼减振分析与试验研究[J].地震工程与工程振动,2000,20(1):105-111.
[2]薛素铎.隔震与消能减振技术在大跨屋盖中的应用[J].建筑结构,2005,35(3):51-53.
[3]Kato S,Nakazawa S.Earthquake response of domes implemented by hysteresis dampers for earthquake isolation[R]//Proc of IASS,LASAAInternational Congress,Sydney,1998.
[4]Yukio T.Application of damping devices to suppress wind-induced responses of buildings[J].Journal of Wind Engineering and IndustrialAerodynamics,1998,74:49-72.
[5]Johnson C D,Kienholz D A.Finite element prediction of damping in structures with constrained viscoelastic layers[J].AIAAJournal,1982,20(9):1284-1290.
[6]中华人民共和国国家标准.GB 50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[7]苏毅.大悬挑钢网架采用筒式粘弹性阻尼器的风振控制研究[D].南京:东南大学,2006.
[2]薛素铎.隔震与消能减振技术在大跨屋盖中的应用[J].建筑结构,2005,35(3):51-53.
[3]Kato S,Nakazawa S.Earthquake response of domes implemented by hysteresis dampers for earthquake isolation[R]//Proc of IASS,LASAAInternational Congress,Sydney,1998.
[4]Yukio T.Application of damping devices to suppress wind-induced responses of buildings[J].Journal of Wind Engineering and IndustrialAerodynamics,1998,74:49-72.
[5]Johnson C D,Kienholz D A.Finite element prediction of damping in structures with constrained viscoelastic layers[J].AIAAJournal,1982,20(9):1284-1290.
[6]中华人民共和国国家标准.GB 50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[7]苏毅.大悬挑钢网架采用筒式粘弹性阻尼器的风振控制研究[D].南京:东南大学,2006.
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