长输管道埋地弯头结构的复杂应力分析  

Complex Stress Analysis on Buried Elbow of Long Distance Pipelines

作　　者：夏梦莹[1] 张宏[1] 刘啸奔 吴经天 

机构地区：[1]中国石油大学(北京)机械与储运工程学院,北京102249 [2]中石化天津液化天然气有限责任公司,天津300457

出　　处：《焊管》2015年第9期22-25,共4页Welded Pipe and Tube

基　　金：中国石油集团工程设计有限责任公司北京分公司科学研究项目"油气田地面工程埋地管道应力分析关键技术研究"(项目号CPEBF-2014-02)

摘　　要：基于非线性有限元法,建立了埋地弯头应力计算的数值分析模型。模型中采用非线性土弹簧模拟土壤对管道的约束作用,采用壳单元模拟管道。以管道内压与温度荷载为载荷条件,分析了管道直径、壁厚、弯头曲率半径与夹角、土弹簧抗力多种特性参数对管道应力的影响,得到了管道最大应力的变化规律。计算结果表明,该方法能够较好地模拟弯头的受力过程,可为埋地弯头的设计与安全评价提供一定的参考依据。A numerical model for stress ealculation of the buried elbow was built, which was established based on the n^mlinear finite element method. The model adopted nonlinear soil springs to simulate the constraint effect of soil on the pipeline, using shell elements to model the pipeline. Taking the pipeline internal pressure and temperature as the load, the influence on pipeline stress of many parameters were analyzed, including pipe diameter, radius of curvature and angle, wall thickness and soil spring [brce, the change laws of nmximal stress were obtained. The calculation results showed that the methud ,＇an well simulate the stress process of the elbow, which can be used tor the design and safety assessment of buried elbow.

关 键 词：焊管 埋地弯头 管土相互作用 非线性土弹簧 应力分析 有限元方法 

分 类 号：TE973[石油与天然气工程—石油机械设备]