高桩墩台结构冰力试验研究

基于某工程冰力物理模型试验,对高桩墩台结构群桩冰力进行分析。结果表明,桩之间的冰力折减、前桩对后桩冰力的掩蔽、冰在各桩前非同时破坏的情况是客观存在的,计算结构冰力时应考虑折减。边缘两侧桩冰力折减较小,中间桩冰力折减较大;随着桩间距减小,冰力呈下降趋势;随冰功角的增加,首迎冰桩的冰力折减水平开始下降,后排桩的掩蔽效应逐渐削弱,本次试验冰的非同时破坏系数为0. 5左右。群桩冰力的折减需要考虑因素较多,是一个复杂的课题,建议在设计时进行模型试验。

Experimental study on ice force of high-pile pier structure

Based on the physical model test of ice force in a project,we analyze the ice force of the high-pile pier structure. The results show that the reduction of ice force between piles,the cover of ice force between the front piles and back piles,and the non-simultaneous destruction of ice in front of each pile exist objectively.The reduction should be considered in calculating the ice force of the structure.The reduction of ice force on both sides of the edge pile is smaller,and that on the middle pile is larger;with the decrease of the pile spacing,the ice force also shows a trend of decrease;with the increase of the ice work angle,the reduction level of ice force on the first ice pile begins to decline,and the masking effect of the back row pile gradually weakens. The non-simultaneous failure coefficient of ice in this test is about 0.5.There are many factors to be considered in the reduction of ice force of the pile group,which is a complex subject. It is suggested to carry out model tests in concrete design.