导管架式海洋平台结构阻尼隔振体系及其减振效果分析
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摘要
导管架式海洋平台结构是当前应用最广的一种平台结构形式。本文研究导管架式海洋平台结构阻尼隔振体系及其减振效果。针对导管架式海洋平台结构的型式与特点 ,为了充分发挥阻尼器的耗能减振作用 ,提出了在平台结构导管架端帽和甲板之间设置柔性阻尼层的新型阻尼隔振方案。针对渤海JZ2 0 2MUQ平台结构 ,建立了海洋平台结构阻尼隔振体系简化计算模型 ,研究了隔振层参数与结构阻尼比的关系以及它们对结构整体和隔振层层间相对位移的控制效果 ;进行了多种冰荷载工况和地震工况的数值模拟。结果表明 ,阻尼隔振方案是导管架式海洋平台结构的一种有效的减振措施
Jacket is the most widely used offshore platform structural style. In this paper, damping isolation system and its vibration suppressed effectiveness analysis for offshore platform structures are studied. First of all, considering the style and character of jacket, a damping isolation scheme, in which the damping layer is laid between the jacket cap and deck is put forward for mitigating the response of offshore structure in dynamical load. Then, a simplified computational model of damping isolation systems is established for JZ20 2MUQ platform structure. The relationships between the parameter of isolation layer and structural damping ratio, including their vibration suppressed effect on the whole structure and the relative displacement of isolation layer are studied. Finally, the simulation analysis under several representative load case of ice and earthquake affairs is performed. The result shows that damping isolation scheme is effective in vibration suppression.
Jacket is the most widely used offshore platform structural style. In this paper, damping isolation system and its vibration suppressed effectiveness analysis for offshore platform structures are studied. First of all, considering the style and character of jacket, a damping isolation scheme, in which the damping layer is laid between the jacket cap and deck is put forward for mitigating the response of offshore structure in dynamical load. Then, a simplified computational model of damping isolation systems is established for JZ20 2MUQ platform structure. The relationships between the parameter of isolation layer and structural damping ratio, including their vibration suppressed effect on the whole structure and the relative displacement of isolation layer are studied. Finally, the simulation analysis under several representative load case of ice and earthquake affairs is performed. The result shows that damping isolation scheme is effective in vibration suppression.
引文
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[3] LeeHH .StochasticAnalysisforOffshoreStructuresWithAddedMechanicalDampers[J].OceanEngineering,1997,24(9):817-834.
[4] 龙旭,吴斌,欧进萍.抗震结构的阻尼减振效果分析[J].世界地震工程,2001,1:40-45.
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[6] 欧进萍,段忠东,肖仪清,等.基于实测动冰力时程的海洋平台结构冰振反应分析[J].海洋工程,1999,17(2):70-81.
[7] 欧进萍,肖仪清,段忠东,等.设置粘弹性耗能器的JZ20-2MUQ平台结构冰振控制[J].海洋工程,2000,18(3):9-14.
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[9] 王翎羽.调谐液体阻尼器(TLD)的减振原理及其在JZ20-2MUQ平台上的减振应用研究[R].天津大学海洋与船舶工程系研究报告,1994.
[10] 渤海海洋结构物检测公司,国家地震局工程力学研究所.94～95年JZ20-2MUQ平台冰力测量报告[R].1995.
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