摘要
敷设在高陡边坡上的输气管道,在未覆土试压时,可能发生管道下滑和应力超限。为了安全配管,基于CAESAR Ⅱ建立了未覆土高陡边坡输气管道的应力分析模型。模型中以管土间的摩擦力和向上的支撑力考虑土壤约束,通过比选三种不同的简化边界条件,确定了坡道两侧有水平增长段的固定约束边界。结合水试压工况等四种加载条件,基于美国ASME B31.8标准提出了各类工况的应力校核方法。计算实例表明,最危险的应力位置为上坡管道顶端与平台间的弯头,最大位移位置为管道最长且最陡峭边坡的顶端,验证了应力计算模型和校核方法的可行性。
Gas pipelines laid in high slopes are prone to overstressing or large displacement.Based on the software CAESAR Ⅱ,a pipeline stress analysis model is established by 3D beam model combined with Stress Intensification Factor.In the model,pipe-soil friction and upward support force are considered as the soil constraint.Conducted is comparison among three different simplified boundary Conditions and determined is the fixed constraint boundary with horizontal extension segment on both sides of the slope pipelines.Combined with four loading conditions,such as working condition of water pressure test and so on and based on the ASME B31.8,stress check methods are proposed for various working conditions and analysis and calculation results show that the most dangerous stress position is located at the convergence between the top of the upward pipeline and the slope base platform and the largest displacement occurs probably at the top of the longest and steepest slope,which proves that the stress calculation model and check methods are feasible.
出处
《天然气与石油》
2013年第6期26-30,7-8,共5页
Natural Gas and Oil
基金
国家自然科学基金"天然气管道跨越结构清管动力响应实验及理论研究"(51174172)
