1. 上海交通大学 海洋工程国家重点实验室， 上海 200240;2. 江苏科技大学 船舶与海洋工程学院， 江苏 镇江 212003
通讯作者:刘昆（1984-），男，副教授，研究方向为船舶碰撞/搁浅性能及新式抗冲击结构设计.通信作者：唐文勇，男，教授，博士生导师，电话(Tel.)：021-34206642;E-mail：wytang@sjtu.edu.cn.基金资助:国家自然科学基金项目（51379093, 51609110, 51779110），高技术船舶科研项目(K7590)Structural Deformation Mechanism Analysis of Web Girders Subjected to In-Plane Load
LIU Kun1,2,FU Jie2,WANG Zili2,TANG Wenyong11. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
摘要/Abstract
摘要： 在遭遇碰撞搁浅事故时，船体往往会受到面内载荷的作用而发生损伤变形，影响船体结构的安全性，因此加筋强桁材在船体结构中具有广泛的应用.以垂直加筋强桁材结构为研究对象，通过开展准静态冲压试验及相应的数值模拟，分析强桁材结构在面内冲压载荷作用下的变形机理，并基于试验与模拟所观察到的结构变形特点，提出强桁材面内受压时的变形模式.以此为基础，运用塑性力学理论，推导出结构变形能、瞬时结构变形抗力及平均结构变形抗力的解析计算公式，并将计算结果与试验结果进行比较验证.研究得到的结构面内受压变形能和抗力解析计算公式，可以快速评估事故载荷下结构的响应情况，对船体耐撞结构设计及抗撞性能评估具有一定的指导意义.
关键词: 垂直加筋强桁材, 面内载荷, 变形机理, 解析计算
Abstract: Stiffened web girders are widely used in ship hull structures. They are often damaged due to the in-plane loads during ship collision and grounding accidents, certainly affecting the safety of the ship structure. In this paper, the longitudinal stiffened web girder is selected as the research object, the quasi-static impact test and related numerical simulations are conducted to investigate the structural deformation mechanism of web girder subjected to in-plane load. Then, a new deformation model for web girders subjected to in-plane load is proposed in accordance with the features found in the test and simulation analysis. Based on the new model, the analytical formulae for energy dissipation, instantaneous force and mean resistance of web girders are obtained in the light of the plastic analysis. Finally, the new analytical method is verified by the results of model test. It turned out that the proposed analytical method can be a reference to the preliminary structural design and assessment for ship crashworthiness.
Key words: longitudinal stiffened web girder, in-plane load, deformation mechanism, analytical method
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