有/无固定墩跨越管道的内力和变形比较

考虑几何非线性，导出了有固定墩跨越管道的内力和挠度计算公式，并从中推荐了简单实用的计算式，通过比较有／无固定墩跨越管道的内力和挠度，得出结论：固定墩减小了管道的挠度、轴向拉力及当量轴向拉力，增大了轴向压力及应量轴向压力；当当量轴向力为压力／拉力时，无固定墩跨越管道的最大弯矩大于／小于有固定墩时的值；有固定墩跨越的管道嵌固端的弯矩与跨中的弯矩相比，绝对值大，无固定墩跨越管道的两者大小关系主要取决于

Comparisons of the Internal Forces and Deflections of Aerial Crossing Pipelines with and without Anchor Blocks

Based on geometrical nonlinearity, equations for calculating internal forces and deflections of aerial crossing pipelines with anchor blocks at both ends are derived, in which simple, practical ones are recommended for design calculation. Comparisons of the internal forces and deflections of aerial crossing pipelines with and without anchor blocks arrive at conclusions that anchor blocks decrease the deflections,axial forces,equivalent axial tensional forces,and increase the equivalent axial compressive forces,that when equivalent axial forces are compressive/tensional,the maximum of bending moments of axial crossing pipelines without anchor blocks is greater/less than one with anchor blocks,and that the at-both-ends bending moment( |M0| )of the pipeline with anchor blocks is greater than one at the middle ( |Mc| ) >but whenever ( |M0|) of the pipeline buried at both ends is greater than ( |Mc|) depends primarily on the lateral resistance coefficient of soil. Based on static analysis of aerial crossing pipelines,suggestions are made that for low temperature pipelines,gas transmission pipelines for off the compression station and constant temperature oil product pipelines,anchor blocks be not necessary,and for hot oil pipeline,scheme comparisons be required to determine whether to install anchor blocks.