导管架平台安装锥体降低冰振效果研究

Effect of adding cone to mitigate ice-induced vibration

冰荷载是寒区海洋结构的控制荷载。在圆柱结构上安装锥体用以降低极值冰力,这一概念已得到理论与模型实验的验证,但是安装锥体对降低结构冰激振动的效果还没有得到充分论证。首先分析和比较了圆柱结构和加锥结构的交变冰力与冰振响应形式。基于现场原型监测系统的实测数据,无论是圆柱结构和加锥结构都能发生强烈的冰激振动,圆柱结构上的稳态冰激振动最为严重。通过一座单腿圆柱结构加装锥体前后的冰振响应监测和分析,得到安装破冰锥体对降低冰振的实际效果。理论分析和实测数据表明,破冰锥体从根本上避免了冰激结构稳态振动的发生。

This paper demonstrates the effect of adding cone to mitigate ice-induced vibration.The dynamic ice force and structure response of vertical and conical structure are discussed.It is found that significant ice induced vibration can occur on both kinds of structures,but that vertical structures suffer from more intense and harmful steady state vibration.Full scale tests were conducted on a monopod structure before and after an ice-breaking cone added.The effectiveness of mitigating ice induced vibration through adding cone was evaluated based on test data.