短程线型单层网壳结构隔震机理研究
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摘要
将短程线型网壳结构的支座设置成隔震支座,对结构进行了隔震控制,分别采用弹簧支座和弹簧阻尼支座对结构进行了控制.分析了结构振型和频率在有控和无控状态下的区别,研究短程线型网壳结构的隔震控制机理.在常遇和罕遇地震作用下,计算网壳结构的最大水平位移、隔震支座的最大水平位移和最大支座反力.研究结果表明:两种隔震装置均有效地控制了短程线型网壳结构的支座反力,弹簧阻尼支座还明显地减少了隔震支座的水平位移.
Isolation control analysis was carried out for geodesic latticed shell in which all horizontal pin supports were changed as spring supports or damped spring supports.The differences of the vibration modes and the frequencies between uncontrolled and controlled structure were studied for analyzing the isolation mechanism of isolated geodesic latticed shell.The structural maximum horizontal displacement,the maximum horizontal displacement at isolators and maximum reactions at supports were calculated under frequent earthquakes and rare earthquakes,respectively.The results indicate that two kinds of isolation devices can control the reactions of geodesic latticed shell effectively.Damped spring supports can also reduce the displacements at those isolated supports significantly.
Isolation control analysis was carried out for geodesic latticed shell in which all horizontal pin supports were changed as spring supports or damped spring supports.The differences of the vibration modes and the frequencies between uncontrolled and controlled structure were studied for analyzing the isolation mechanism of isolated geodesic latticed shell.The structural maximum horizontal displacement,the maximum horizontal displacement at isolators and maximum reactions at supports were calculated under frequent earthquakes and rare earthquakes,respectively.The results indicate that two kinds of isolation devices can control the reactions of geodesic latticed shell effectively.Damped spring supports can also reduce the displacements at those isolated supports significantly.
引文
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[2]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社,2005.
[3]HOUSNER G W,BERGMAN L A,CAUGHEY T K,et al.Structural control:past,present,and future[J].Journal of Engineering Mechanics,ASCE,1997,123(9):897-971.
[4]叶继红,陈月明,沈世钊.网壳结构TMD减振系统的优化设计[J].振动工程学报,2000,13(3):376-384.
[5]叶继红,陈月明,沈世钊.TMD系统在单层球壳振动控制中的参数分析[J].空间结构,1999,5(2):10-17.
[6]范峰,沈世钊.网壳结构的粘滞阻尼减振分析与试验研究[J].哈尔滨建筑大学学报,2000,33(3):18-22.
[7]SHENTON III H W,HOLLWAY E S.Effect of stiff-ness variability on the response of isolated structures[J].Earthquake Engineering and Structural Dynam-ics,2000,29(1):19-36.
[8]SKINNER R I,ROBINSON W H,MCVERRY G H.工程隔震概论[M].地震出版社,1996.
[9]MAKRIS N,CHANG S P.Effect of viscous,visco-plastic and friction Damping on the response of seismicIsolated structures[J].Earthquake Engineering andStructural Dynamics,2000,29(1):85-107.
[10]PRANESHM,SINHA R.VFPI:an Isolation Devicefor Aseismic Design[J].Earthquake Engineeringand Structural Dynamics,2000,29(5):603-627.
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