首页|偏心载荷作用下弯管组合段局部屈曲失效分析

偏心载荷作用下弯管组合段局部屈曲失效分析

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为研究弯管组合段在复杂载荷作用下的屈曲行为,提出1 种基于远场应变评估管道稳定性的方法,利用数值模拟方法,建立偏心载荷作用下弯管组合段有限元模型,确定临界屈曲状态下管道的极限载荷及应变状态,并研究内压、壁厚以及载荷分布对弯管组合段极限承载能力与极限应变能力的影响.研究结果表明:内压增加或壁厚减少都会降低管道的极限承载能力,均布载荷增加与非均布载荷减少会增强管道抵抗屈曲能力;距离褶皱中心为0.21D的远场应变可以作为管道临界屈曲应变,其极限压缩应变值为0.5%.研究结果可为复杂载荷下弯管组合段的稳定性评估提供参考.
Analysis on local buckling failure of bend pipe combined section under eccentric loading
To study the buckling behavior of bend pipe combined section under the complex load,a method for evaluating the pipeline stability based on far-field strain was proposed.The finite element model of pipe bending section under eccentric load is established by numerical simulation method.The ultimate load and strain state of the pipeline under critical buckling state were determined,and the influence of internal pressure,wall thickness and load distribution on the ultimate bearing capacity and ultimate strain capacity of the bend pipe combined section were investigated.The results show that the increase in internal pressure or the decrease in wall thickness will reduce the ultimate bearing capacity of the pipeline.In addition,the increase of uniform load and the decrease of non-uniform load have an enhanced effect on the buckling resistance of the pipeline.The far-field strain with a distance of 0.21D from the center of wrinkle can be used as the critical buckling strain of the pipeline,and its ultimate compressive strain is 0.5%.The research results can provide a reference for the stability evaluation of the bend pipe combined section under complex loads.

bend pipe combined sectioneccentric loadlocal bucklingultimate bearing capacityultimate strain capacity

王垚、张怡、熊道英、帅义、帅健、高唯

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国家石油天然气管网集团华南分公司,广东 深圳 518000

中国石油大学(北京)安全与海洋工程学院,北京 102249

应急管理部油气生产安全与应急技术重点实验室,北京 102249

弯管组合段 偏心载荷 局部屈曲 极限承载能力 极限应变能力

国家石油天然气管网集团有限公司华南分公司—中国石油大学(北京)科技合作专项国家自然科学基金国家重点研发计划子课题中国石油大学(北京)优秀青年学者科学基金

GWHT20210042643522040712022YFC3004802-42462023QNXZ006

2024

10.11731/j.issn.1673-193x.2024.03.009

中国安全生产科学技术
中国安全生产科学研究院

中国安全生产科学技术

CSTPCD北大核心
影响因子：1.119
ISSN：1673-193X
年,卷(期)：2024.20(3)
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