高压大口径油气管道跨长计算

基于几何非线性,考虑当量轴向力(S₀)对管道挠曲的影响,提出了有或无固定墩单跨无补偿器管道强度计算方程。有固定墩跨越管道的设计计算是显式的。对于无固定墩两端埋地跨越管道,认为埋地管道的横向反力和轴向摩擦力分别与其横、轴向位移成正比,内力和变形计算最终可归结为两个非线性方程的求解,管道的自振固有频率可由特征方程数值解求得。提出了S₀为压力或拉力的显式判别式。并区分S₀为压力、零、拉力,列出内力、挠度、频率计算方程。介绍了静强度验算和动力设计的方法,给出了算例。

OIL AND GAS PIPELINE SPAN CALCULATION ABOUT HIGH PRESSURE AND LARGE DIAMETER

Based on geometrical non-linearity, considering the influence of equivalent axial force (S₀ ) on the deflection of pipeline,the paper presented the equations with or without anchor blocks at both ends for calculating static and dynamic strengths of aerial crossing pipelines. The equations for the pipelines with anchor blocks are explicit. As for the pipelines without fixed anchors at both ends, it is regarded that the lateral and longitudinal resistance of soil to buried pipelines is proportional to the lateral and longitudinal displacements of pipelines, respectively.Calculations of internal forces and deformations are reduced to the solution of two nonlinear equations, and natural frequenciesof pipelines are determined from the characteristic equations.The explicit criterion S₀ either compressive or tensional was presented. The paper described the verified examples of the static and dynamic strengths.