冲击荷载作用下钢管桩的涡振研究
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摘要
研究了海洋钢管桩搭设支撑前,在打设力、水流、波浪共同作用下引起的涡振机理。目的是解决海洋钢管桩在浪流、打设力等冲击荷载作用下的破坏问题。提出涡振概念并分析产生涡振破坏的情况;建立钢管桩在冲击荷载作用下涡振合成方程,并对涡振合成方程进行求解。结果表明,通过用非线性方法分析钢管桩的涡振机理、研究钢管桩的振动合成方程及其解,可以有效地减轻结构在动力荷载作用下的反应与损伤、并有效地提高结构的抗振能力和抗灾性能,是抗振减灾积极有效的对策,对工程实际具有重大理论价值。
The vibration mechanism analysis of the sea steel-pipe piles forced by hitting,current and wave is carried out before the support built.The aim is to solve the damage problem of sea steel-pipe piles forced by any load such as hitting,current and wave.The concept of vortex vibration and the situation of producing vortex damage are put forwarded,composition vortex vibration equation and solution under construction are set up.The result shows that the vibration mechanism of steel-pipe piles analyzed by means of nonlinear,composition vortex vibration equation and solution may effectively ease reaction and injury,effectively lift the capability of resisting vibration and the reducing natural disaster.This is valid countermeasure to resist vibration and reduce disaster and important value theory to actual engineering.
The vibration mechanism analysis of the sea steel-pipe piles forced by hitting,current and wave is carried out before the support built.The aim is to solve the damage problem of sea steel-pipe piles forced by any load such as hitting,current and wave.The concept of vortex vibration and the situation of producing vortex damage are put forwarded,composition vortex vibration equation and solution under construction are set up.The result shows that the vibration mechanism of steel-pipe piles analyzed by means of nonlinear,composition vortex vibration equation and solution may effectively ease reaction and injury,effectively lift the capability of resisting vibration and the reducing natural disaster.This is valid countermeasure to resist vibration and reduce disaster and important value theory to actual engineering.
引文
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[3]余建星,等.船舶与海洋结构物可靠性原理[M].天津:天津大学出版社,2001.
[4]余建星,孙大军,罗延生,等.涡激振动下管桥段的模糊动力可靠性研究[J].地震工程与工程振动,2002,(10):36~40.
[5]刘润,闫澍旺,等.随机场理论在海洋结构物地基可靠度分析中的应用[J].天津大学学报,2003,(1).
[6]姚雄亮,陈起富.串列双圆柱在均匀流场中涡激振动综述[J].哈尔滨船舶工程学院学报,1994,(12):1~15.
[7]倪振华.振动力学[M].西安:西安交通大学出版社,1989.
[8]方华灿,陈国明.海洋平台结构整体疲劳寿命的预测[J].石油矿场机械,2000,29(5):1~5.
[9]张立,金伟良.海洋平台结构疲劳损伤与寿命预测方法[J].浙江大学学报,2002,(3):138~142.
[10]许亮斌,陈国明,陆玲.海洋石油平台冰激振动可靠性分析[J].石油工业技术监督,2002,(11).
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