船舶舱室油池火灾下甲板板架剩余极限强度分析  

Ultimate Strength Analysis of Deck Grillage under Oil Tank Fire in Ship's Cabin

作　　者：郝军凯 薛鸿祥[1] 袁昱超 唐文勇[1] HAO Junkai;XUE Hongxiang;YUAN Yuchao;TANG Wenyong(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240

出　　处：《中国造船》2020年第1期131-140,共10页Shipbuilding of China

基　　金：韩国教育部国家研究基金(NRF)基础科学研究项目(NRF-2017R1D1A3B03032051);2019年韩国海洋水产部海洋水产科学技术振兴院研究项目。

摘　　要：基于大涡模拟算法,使用FDS火灾动力学仿真软件模拟舱室火灾,将环境温度映射至结构有限元模型。考虑结构的初始缺陷和材料的高温热力学特性,采用顺序热力耦合算法计算甲板板架在火灾发展过程中的动态热力响应。基于显式动态算法研究板架轴向压缩时的高温剩余极限强度,并分析结构失效模式。计算结果表明,高温环境下的板架受到轴向压缩载荷时,由于横梁间加筋板发生崩溃而达到极限状态,且油池中心位于横梁间时更偏于危险;火灾发生前期,板架高温剩余极限强度衰减较快,后期趋缓。这项研究可为实际火灾场景下的船舶结构抗火设计与安全评估提供参考。Cabin fire is a common type of fire in ships,which can easily cause serious casualties and property losses.In this paper,based on large eddy simulation algorithm,FDS fire dynamics simulation software is used to simulate the cabin fire,and the environmental temperature is mapped to the structural finite element model.Considering the initial imperfection of the structure and the high temperature thermodynamic characteristics of the material,dynamic thermodynamic response of the deck grillage during the fire development process is calculated by sequential thermodynamic coupling algorithm.Residual high temperature ultimate strength of the deck grillage is studied based on the explicit dynamic algorithm,and the failure modes of the structure are analyzed.The results show that when the deck grillage under high temperature is subjected to an axial compression load,the stiffened plate between beams will collapse and reach to the limit state,and the center of the oil pool located between beams is more dangerous.In the early stage of the fire,residual ultimate strength of the deck grillage at high temperature declines rapidly and slows down in the later stage.At the moment when the fire has lasted for 800 seconds,residual ultimate strength corresponding to two positions of the oil pool is only 13%and 15%of that at the room temperature respectively.The research work may provide a reference for fire resistance design and safety evaluation of ship structures under actual fire scenarios.

关 键 词：舱室火灾 甲板板架 热力响应 极限强度 失效模式 

分 类 号：X928.7[环境科学与工程—安全科学]