沧临管道大浪淀跨越段下拉筋断裂原因分析

非对称载荷下斜索随塔顶滑轮动作而产生的滑移增辑跨越管道结构分析的复杂性。按变形几何条件导出了非对称承载时斜索张力与斜索滑移、伸长及管道变形关系，应用数值方法并结合有限元法通过试算迭代求得了非对称加载下沧临管道大淀跨越管道下拉筋的平衡拉力，以此为基础对该处下拉筋断裂原因作了初步分析。在进行下拉筋断裂后管道失衡变形的模拟计算基础上对结构强度和稳定问题进行了评估，结果表明，提出了分析方法是可行的。

Analysis on the Rupture of Under-stretching Steel in Dalangdi- an Spanning Part of Cangzhou--Linyi Oil Pipeline

It is more complex and difficult to perform structure analysis for the spanning part of Cangzhou-Linyi oil pipeline under the unsymmetrical loading when the slippage effect of inclined flexible steel cable induced by the movement of the pulley in bearing tower top. Differential equations were obtained according to the geometrical and deformation relationship about cable slippage, stretching and pipeline transverse displacement,which would be useful to calculate balancing tension force and then analyze the cause on the rupture of under-stretching steel. The numerical simulation calculation has been made,the future influence on the safe operation to the pipeline has also been estimated due to the greater transverse deformation on the spanning part after the rupture. The results show that the method outlined by the authors in the paper is available.