冰激柔性直立桩结构振动的模型试验

冰激直立结构振动问题已在世界范围内得到了广泛的研究，但目前的研究成果与实际工程的应用要求还相去甚远．为探索冰激振动进程的控制机理，进行了低冰速、中冰速和高冰速下的动冰力模型试验．试验发现，冰激直立桩结构稳态振动过程中的控制机理是冰与结构的相互作用，而冰以间歇性延一脆压碎模式发生破坏是相互作用进程中的重要特征．基于这一现象，提出了一个直接反映冰与结构相互作用水平的参数——相互作用系数．结果表明，当该系数处于20-45时，结构在冰力作用下会发生剧烈的响应．

Model Test of Ice-Induced Vibration on Compliant Vertical Pile

The problem of ice-induced vibration on vertical structures has been widely studied, but the results are still far to be applied in practical engineering. To explore the mechanism that controls the procedure of iceinduced vibration, dynamic ice force model tests were performed at low-speed, intermediate-speed and highspeed. The interaction of ice and structure was found to be the control mechanism of the ice-induced steadystate vibration process in the model test, and the intermittent ductile-brittle crushing mode of ice failure was also found to be the most important characteristic in the process of interaction. Based on this phenomenon, a parameter that directly reflects the interaction level of ice and structure, interaction coefficient, was put forward. The test results indicate that the structure will be excited with violent response when the interaction coefficient falls in the range of 20-45.