摘要
针对海底管道在铺设和服役期间受到扭矩与外压联合作用发生屈曲的问题,进行缩比尺管道实验和有限元建模分析,对管道的变形和压溃规律进行研究.以缩尺比管道实验为基础,利用ABAQUS有限元软件,对实验管件在扭矩与外压联合作用下的压溃破坏进行模拟,并与实验结果进行对比,验证模型的可靠性.基于有限元分析,研究了扭矩和外压联合作用下管道的截面变形和承载极限.研究结果表明,管道受扭矩作用时,管道截面椭圆度与扭矩是近似指数相关,扭矩较小时,截面无明显变形;当扭矩接近扭矩承载极限时,椭圆度剧增.管道受扭矩和外压联合作用时外压对管道变形影响更大,管道的破坏以压溃屈曲为主,截面为“哑铃状”.管道椭圆度缺陷越大,外压承载极限越小;管道承受的扭矩载荷越大外压承载极限越小;得到了扭矩与外压承载极限的无量纲关系曲线,此关系不受椭圆度影响,扭矩越大外压承载极限的下降速率越大;建议海底管道设计扭矩不超过扭矩承载极限值的70%,以提升管道在扭矩与外压联合作用下的安全性.P-T路径比T-P路径更危险,载荷路径引起的管道承载极限差异在10%以内,椭圆度会降低载荷路径的影响差异.
Considering the buckling of the submarine pipe under the synergistic action of torsion and external pressure during laying and service,the experiment of the pipe with reduced scale and finite element modeling analysis is performed.The law of pipe deformation and collapse is studied.Based on the pipe experiment and finite element software ABAQUS,the crushing failure of the test pipe under torsion and external pressure is simulated.The reliability of the model is verified by comparing its results with those obtained experimentally.Based on finite element analysis,section deformation and bearing limit of the pipe under torsion and external pressure are studied.The results show that,when the pipe is subjected to torsion,the relation between its ovality and torsion is approximately exponential.When the torsion is small,the section has no obvious deformation,and on reaching the torsion bearing limit,the ovality increases sharply.When the pipe is subjected to the complex load of torsion and external pressure,the latter has a greater influence on pipe deformation.The failure of the pipe is mainly crushing and buckling,and the deformed section is“dumbbell-shaped”.The larger the ovality defect of the pipe,the smaller the external pressure bearing limit;the larger the torsion load the pipe bears,the smaller the external pressure bearing limit.The dimensionless relation curve between torsion and external pressure bearing limit is obtained,which is not affected by oval-ity.The greater the torsion,the greater the decreasing rate of the external pressure bearing limit.It is suggested that the design torsion of the pipe should not exceed 70% of the limit value of the bearing torque so that it can improve the safety of the pipe under torsion and external pressure.The P-T path is more dangerous than the T-P path,and the pipe bearing limit difference caused by the loading paths is less than 10%.The ovality will reduce the limit difference of the loading paths.
作者
余杨
胡少谦
韩梦雪
余建星
刘泽生
Yu Yang;Hu Shaoqian;Han Mengxue;Yu Jianxing;Liu Zesheng(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;Tianjin Key Laboratory of Port and Ocean Engineering,Tianjin University,Tianjin 300072,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2022年第6期596-602,共7页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51879189,52071234)
高技术船舶科研项目经费资助项目(SSBQ-2020-HN-01-03).
关键词
海底管道
扭矩
外压
屈曲变形
外压承载极限
submarine pipe
torsion
external pressure
buckling deformation
external pressure bearing limit
