摘要
基于现场原型结构测量,研究了冰与柔性直立结构作用产生挤压破坏过程形成的交变冰力。结果发现:随着冰速的增加,可以出现三种不同冰力形式并分别引起结构准静态振动、稳态振动和随机振动响应。进一步对形成不同冰力模式的机理进行了分析,提出了随着冰速变化,冰与结构相对速率变化导致结构近场冰可以出现塑性破坏、裂纹损伤破坏与纯脆性破坏三种破坏模式,并解释形成交变荷载过程。
Based on full-scale structural tests, the cyclic ice loads formed in crushing failure when ice interacts with vertical compliant structures are investigated. The results illustrate that three ice force modes, quasi-static, steady-state and random vibration, could be formed with the increase of ice speed. The mechanisms of the three ice force modes are analyzed. It is demonstrated that with the changing of ice speed, the loading rates of near field ice sheet, depending on the relative speed of ice and structure, can make ice fail in three forms, plastic failure, ductile-brittle transition failure and brittle failure. Explanations are given to describe the process of cyclic ice formation.
出处
《工程力学》
EI
CSCD
北大核心
2004年第1期202-208,共7页
Engineering Mechanics
基金
国家自然科学基金资助项目(59739170)
关键词
冰荷载
冰激结构振动
冰的破坏行为
动冰力
ice load
ice-induced vibration
ice failure process
dynamic ice force
