Buckling damage is one of the biggest safety issues for subsea pipelines. Buckling behaviors of the subsea pipeline with integral buckle arrestors under external pressure are studied experimentally and numerically herein. Pressure chamber tests of four full-sized pipeline with identical thickness and different diameters are presented. An emerging vector form intrinsic finite element method (VFIFE) is introduced to simulate the whole buckling process both in dynamic and quasi-static cases, including local collapse, propagation, buckling prevention, and crossover. Numerical schemes for multifold nonlinearities and multithreaded computation are proposed and tested. Results of experiments and numerical simulations, as well as computations of the traditional finite element method and DNV specifications, are compared. Thusly it is indicated that the VFIFE model can accurately (within $\pm$ 1.5%) predict the buckling loads that initiate local collapse, propagation and crossover, and simulate the dynamic and quasi-static buckling modes for pipelines with practical range of diameter-to-thickness ratios greater than 20. For thick parts where integral arrestor with diameter-to-thickness ratios smaller than 20 located, the VFIFE thin shell element may underestimate the structural strength about 8.0%. The VFIFE can directly simulate the pipeline buckling behavior without special processing for the iterative calculation and the stiffness matrix convergence, and achieve the parallel efficiency over 90% for a common computer (12 threads, 4G RAM). Thus, the VFIFE can provide a new, practical and universal analytic strategy for subsea pipeline buckling analysis.

屈曲损坏是海底管道的最大安全问题之一。本文通过实验和数值研究了带有整体式扣环避雷器的海底管道的屈曲行为。给出了四个具有相同厚度和不同直径的全尺寸管道的压力腔测试。引入了一种新兴的矢量形式固有有限元方法（VFIFE），以模拟在动态和准静态情况下的整个屈曲过程，包括局部坍塌，传播，屈曲防止和交叉。提出并测试了多重非线性和多线程计算的数值方案。比较了实验和数值模拟的结果，以及传统的有限元方法和DNV规范的计算结果。$\pm$1.5％）预测引起局部塌陷，传播和交叉的屈曲载荷，并模拟直径与厚度比的实际范围大于20的管道的动态和准静态屈曲模式。对于带有直径整体式避雷器的较厚零件如果厚度比小于20，则VFIFE薄壳元件可能会低估大约8.0％的结构强度。VFIFE可以直接模拟管道的弯曲行为，而无需进行特殊的迭代计算和刚度矩阵收敛处理，对于一台普通计算机（12个线程，4G RAM），并行效率可以达到90％以上。因此，VFIFE可以为海底管道屈曲分析提供一种新的，实用的，通用的分析策略。