冰排在锥面上的断裂长度  

Breaking length of drifting sheet ice against conical surface of structures

作　　者：李锋[1] 于晓[1] 胡玉境[1] 岳前进[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116023

出　　处：《海洋工程》2002年第4期63-67,77,共6页The Ocean Engineering

基　　金：国家自然科学基金重点资助项目(59739170)

摘　　要：依据简化的窄锥冰力模型给出了冰排在锥面上弯曲断裂长度的分析解和无量纲参数(长厚比k)形式给出的结果。由此方法可得到与现场观测结果大体吻合的理论预测值。根据分析解,相关影响因素主要是冰排爬坡的阻力,取决于坡角和接触表面性质;其次是极限破坏时的接触宽度,与相互作用的过程相关。与相近分析模型的解及国外模型试验结果进行比较,说明提出的方法适用的主要范围是窄锥结构,并应满足弯曲变形的小挠度条件。Determination of the breaking length of ice sheet against iceresist structures is one of the basic problems for the analysis on dynamic load and iceenvironment conditions of offshore structures. Under the condition of narrow conical structures, this research is valuable in application. Determination of the period of dynamic iceload is one of its important applications. An approximate method for determining the analytical solution of the breaking length of sheet ice under bending is presented. The results are expressed by a dimensionless parameter (k, lengththickness ratio) which may be convenient for comparison. The forecast results are coinciding with the average value observed in site. According to the analytical solution, among the factors affecting k values, resistance to ice sheet is primary, which is dependent on conditions of the slope surface; contact width in limit condition is secondary, which is related to icestructure interacting process. Applicability of the method is verified by comparing two analogous analytical solutions and the observations in laboratory. The results show that this method is applicable mainly for the narrow structure problem, and the small deflection condition should be satisfied.

关 键 词：冰排 海冰 断裂长度 窄锥结构 冰力函数 坡角 接触表面 

分 类 号：P731.15[天文地球—海洋科学]