沧临管道大浪淀跨越段管壁皱折原因分析

按结构分析方法建立了斜拉钢索支承跨越段力学模型，提出了钢索非线性结构性能的线性化处理方法及数值实施方案。在此基础上，编制了大浪淀跨越段整体结构分析程序，对不同输送工艺对应的载荷条件下跨越管道的拉移及应力进行了分析，并根据计算结果按相应设计规范进行了结构安全性校核评估。结果表明，该处管壁局部皱折的出现与工艺条件变化，温度变化，输量减少后内压变化以及固定墩可能产生的轴向位移等因素有关。

Analysis on Pipe Buckling of Dalangdian Aerial Crossing Pipeline in Cangzhou-Linyi Oil Pipeline

The analytical model is established for the pipeline crossover section supported with diagonal rope in accordance with structure mechanics and a numerical method is suggested for the nonlinear structure behavior of diagonal rope. Combined with FEM,the analytical program of the whole structure has been made. First, the structure displacements and stresses are calculated for the crossover section under various loads caused by different transportation processes with the program; then, the correspondent criterion specified by design codes are used to check the structure's safety. The results show that the buckling of pipe wall are possibly caused by the changes of temperature and internal pressure after the alternative transportation processes are applied to the pipeline as well as by the axial displacements of anchor blocks due to temperature rising.