【摘要】 直埋供热管道在温度应力作用下的屈曲变形是管道设计的一个重要问题。应用有限元软件ANSYS,建立三维管土相互作用的有限元模型,模拟出温度应力作用下管道非线性屈曲变形过程。对不同的管道埋深、管径、管土摩擦系数以及初始缺陷等影响因素进行参数化分析,得出了不同因素影响下管道的临界屈曲温差和屈曲变形规律。结论表明在初始缺陷小,埋深大,管径大等情况下直埋供热管道具有较强的整体稳定性。更多还原

【Abstract】 The vertical buckling of buried heating-pipelines caused by temperature stress is an important issue for pipeline design.ANSYS was applied to build the three-dimensional model of soil-pipe contact interaction and simulated the nonlinear buckling process of the pipeline.Analysis on different influences,such as initial imperfection,cover depth,pipe diameter and pipe-soil friction coefficient obtained critical buckling temperature and the law of buckling deformation which indicated that smaller initial imperfection,larger cover depth and pipe diameter can ensure the stability of buried heating-pipelines.更多还原