复杂载荷条件下有缺陷海底管道非线性屈曲分析  

Nonlinear buckling of subsea pipes with imperfection under complex loads

作　　者：陈飞宇[1] 余建星[1] 赵羿羽[1] 孙震洲[1] 刘见德[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《中南大学学报（自然科学版）》2015年第7期2701-2706,共6页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展规划(973计划)项目(2014CB046803);国家自然科学基金资助项目(51239008);天津科委资助项目(Z14SJENG0060);国家科技重大专项项目(2011ZX05030-006)~~

摘　　要：针对有初始缺陷海底管道在弯曲、轴力和外部静水压力联合作用下的复杂载荷屈曲压溃问题,建立管道的屈曲压溃理论模型,研究中考虑管道变形的几何非线性和材料非线性,运用结构弹塑性本构关系,基于虚功原理建立管道屈曲压溃方程;运用MATLAB编程进行数值计算,分别研究分析弯曲、轴力和外部静水压力单独作用,以及3种载荷联合作用的管道压溃压力。研究结果表明:复杂载荷条件下的有缺陷管道,尤其是当轴力和曲率比较大时,各因素对管道屈曲压溃压力影响的非线性特征逐渐明显;多种载荷的联合作用与单一载荷对屈曲压溃压力的影响是不一致的。研究结果可为实际工程中海底管道临界屈曲载荷的确定、危险位置的辨识、设计中的结构参数优化以及施工中的屈曲控制提供理论依据,从而保障海洋油气输送安全。In order to study the buckling collapse of subsea pipes with initial imperfection under the complex loads including bending, axial force and external hydrostatic pressure, a theoretical model of pipe＇s buckling was established. Considering the geometric and material nonlinearity in pipe＇s deformation, utilizing the structural elastic-plastic constitutive relation, the pipe＇s buckling equation was derived based on the principle of virtual work. According to the MATLAB programming, the collapse pressures of the pipe were calculated under the bending, axial force or external hydrostatic pressure, and under the combined effect of the three loads, respectively. The results show that for the pipe with initial imperfection under complex loading condition, especially when the axial force and curvature are large, the loading impact on the pipeline buckling collapse presents nonlinear characteristic. And the influences of complex loads and single load are different. The research results can provide a theoretical foundation for the determination of critical buckling load, identification of hazardous location, design in the structural parameter optimization and buckling control in actual construction, thereby guaranteeing the safety of offshore oil and gas transport.

关 键 词：海底管道 复杂载荷 屈曲压溃 非线性 压溃压力 

分 类 号：P756.2[天文地球—海洋科学]