Schwedler型单层网壳结构隔震分析
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摘要
将Schwedler网壳结构的支座设置成隔震支座,分别采用弹簧支座和弹簧阻尼支座对结构进行了隔震控制。在有控和无控状态下,计算了Schwedler网壳结构的自振频率,初步分析了Schwedler网壳结构的隔震控制机理。在罕遇地震作用下,对网壳结构进行了时程分析,对网壳结构的最大水平位移、隔震支座的最大水平位移、最大支座反力和网壳结构的杆件轴力进行了数值计算。研究结果表明:两种隔震装置均有效地控制了Schwedler网壳结构的支座反力和杆件轴力,弹簧阻尼支座还明显地减少了隔震支座的水平位移和隔震结构的水平位移。隔震方法对于大跨网壳结构的减振是有效的。
Isolation control analysis was carried out for Schwedler 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 structures were studied for analyzing the isolation mechanism of isolated Schwedler latticed shell.The structural maximum horizontal displacement,the maximum horizontal displacement at isolators,the maximum reactions at supports and the structural element axial forces were calculated under rare earthquakes.The results have indicated that two kinds of isolation devices can control the reactions of Schwedler latticed shell effectively.Damped spring supports can also reduce the displacements at those isolated supports and the displacements of the isolated shell significantly.Isolation is effective for reducing the vibration of large span shell.
Isolation control analysis was carried out for Schwedler 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 structures were studied for analyzing the isolation mechanism of isolated Schwedler latticed shell.The structural maximum horizontal displacement,the maximum horizontal displacement at isolators,the maximum reactions at supports and the structural element axial forces were calculated under rare earthquakes.The results have indicated that two kinds of isolation devices can control the reactions of Schwedler latticed shell effectively.Damped spring supports can also reduce the displacements at those isolated supports and the displacements of the isolated shell significantly.Isolation is effective for reducing the vibration of large span shell.
引文
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[3]Housner G W,Bergan L A,Caughey T K,et al.Structural Control:Past,Present,and Future[J].Journal of Engineering Mechanics,1997,123(9):897-971.
[4]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,2000,20(1):18-22.
[5]Shenton III H W,Hollway E S.Effect of Stiffness Variability on the Response of Isolated Structures[J].Earthquake Engineering and Structural Dynamics,2000,29(1):19-36.
[6]Skinner R I,Robinson W H,McVerry G H.工程隔震概论[M].谢礼立,周雍年,赵兴权译.北京:地震出版社,1996.
[7]Makris N,Chang S P.Effect of Viscous,Viscoelastic and Friction Damping on the Response of Seismic Isolated Structures[J].Earthquake Engineering and Structural Dynamics,2000,29:85-107.
[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,Bergan L A,Caughey T K,et al.Structural Control:Past,Present,and Future[J].Journal of Engineering Mechanics,1997,123(9):897-971.
[4]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,2000,20(1):18-22.
[5]Shenton III H W,Hollway E S.Effect of Stiffness Variability on the Response of Isolated Structures[J].Earthquake Engineering and Structural Dynamics,2000,29(1):19-36.
[6]Skinner R I,Robinson W H,McVerry G H.工程隔震概论[M].谢礼立,周雍年,赵兴权译.北京:地震出版社,1996.
[7]Makris N,Chang S P.Effect of Viscous,Viscoelastic and Friction Damping on the Response of Seismic Isolated Structures[J].Earthquake Engineering and Structural Dynamics,2000,29:85-107.
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