锥体结构冰荷载速度效应的定性分析  

A Qualitative Analysis of the Velocity Effects of Ice Load on a Conical Structure

作　　者：李锋[1] 胡玉镜[1] 岳前进[1] 毕祥军[1] 

机构地区：[1]大连理工大学工程力学系,辽宁大连116024

出　　处：《冰川冻土》2003年第S2期322-325,共4页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金重点项目(59739170)资助

摘　　要：依据原型结构现场测量和有限元法,对锥体结构动冰力的速度效应进行了定性分析.试验结果显示,动冰力随冰速增加的趋势与冰排弯曲破坏由楔梁型向板型的转型过渡相联系.当冰排开始向非弯破坏转变后,冰速效应不再显著.论证了动冰力分析应按照冰变形和破坏模式的转变趋势进行定性地分类.通过等截面梁模型有限元分析,证明冰速对冰梁断裂长度有影响,随梁端位移速度的增加,断裂长度趋向于减小.A qualitative analysis of velocity effects of ice load is made for conical offshore structure. On the basis of a prototype structure tests, it is found that increasing of dynamic ice force with velocity is interrelated with the transition of bending failure modes between wedged beam-type and plate-type. When failure mode has been transformed into a non-bending type, velocity effect is no longer noticeable. It is demonstrated that a qualitative classification according to the tendency of deformation and failure of ice is necessary for analyzing dynamic ice force. By a finite element analysis of the ice beam, it is proved that there is a definite velocity effect on breaking length. The breaking length tends to decrease with increasing speed at the end section of the beam.

关 键 词：冰荷载 锥形结构 速度效应 定性分析 

分 类 号：P731.15[天文地球—海洋科学]