轴压下非黏结柔性立管响应特性的数值计算方法

摘要/Abstract

摘要：

为避免传统数值方法对非黏结柔性立管骨架层和抗压铠装层简化导致其应力计算不准确的问题，给出了非黏结柔性立管响应特性的一种数值计算方法，计入骨架和抗压铠装层实际截面形状及层间相互作用，既能保持各层几何形状与真实形状高度一致，又具有高效、高精度的特点，能够有效模拟骨架和抗压铠装层受力、失效及层间接触.计算了8层非黏结柔性立管在轴向压缩载荷下的响应特性，结果表明：数值解与理论值吻合较好；承受压缩载荷的主要为拉伸铠装层；非黏结柔性立管抗压刚度远小于抗拉刚度；立管顶端边界条件对轴向压缩性能影响不大.

关键词: 非黏结柔性立管, 压缩, 接触, 准静态, 数值计算方法

Abstract:

In order to avoid inaccurate stresses of simplified carcass and zeta layers resulted from the traditional numerical method, a numerical method to predict the behavior of unbonded flexible risers was presented by taking complicated crosssections of carcass, zeta layers and interaction between all layers into consideration, which not only made the finite element model highly consistent with the real geometrical shapes of layers, but also had high efficiency and precision. The numerical method could effectively conduct stress evaluation of carcass, zeta layers, failure modes and interaction between all layers. The behavior of an eightlayer unbonded flexible riser under axial compression was predicted. It is shown that numerical results are in good agreement with theoretical results; tensile armor layers are the main bearing layers; compressive stiffness is much smaller than tensile stiffness; and boundary conditions have little influence on the compressive property.

Key words: unbonded flexible risers, compression, contact, quasistatic, numerical compution method

中图分类号:

P 751

任少飞，唐文勇，薛鸿祥. 轴压下非黏结柔性立管响应特性的数值计算方法[J]. 上海交通大学学报（自然版）, 2014, 48(04): 565-569.

REN Shaofei,TANG Wenyong,XUE Hongxiang. A Numerical Method to Predict the Behavior of Unbonded Flexible Risers Under Axial Compression[J]. Journal of Shanghai Jiaotong University, 2014, 48(04): 565-569.

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