Physical and finite element modeling of lateral stability of offshore skirted gravity structures subjected to iceberg impact load
Physical and finite element modeling of lateral stability of offshore skirted gravity structures subjected to iceberg impact load
复制标题
冰山冲击载荷作用下海上裙边重力结构横向稳定性的物理和有限元建模
DOI：
10.1016/j.oceaneng.2008.08.005
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发表时间：
2008
影响因子：
5
通讯作者：
H. Ko
中科院分区：
文献类型：
--
作者：
M. Dewoolkar;J. Hwang;H. Ko
采用三维有限元模型研究了典型的大型裙边重力结构的抗滑动静稳定性。数值模型与离心机试验结果进行了对比验证。选择一组特定的尺寸来模拟离心机中典型的裙边重力结构，该结构具有两种类型的地基土：均匀饱和砂和夹在两层砂之间的粘土区。有限元模型中使用的土抗剪强度参数是根据在离心机中获得的飞行中锥突阻力测量值估计的。采用验证的有限元模型进行了数值参数研究。参数包括粘土带的深度和强度以及外荷载的倾斜度。结果表明，一个相对简单的三维有限元模型可以有效地提供设计这样一个关键且昂贵的海上结构所需的信息。基于锥贯阻力测量和已发表的经验关联的基本Mohr-Coulomb强度参数和模量在有限元模拟中是合适的。
Static stability mainly against sliding of a typical, relatively large skirted gravity structure was investigated using three-dimensional finite element modeling. The numerical model was validated against centrifuge test results. A specific set of dimensions was chosen to model a typical skirted gravity structure in a centrifuge with two types of foundation soils: uniform saturated sand and a clay zone sandwiched between two sand layers. Soil shear strength parameters used in the finite element models were estimated from in-flight cone penetration resistance measurements obtained in the centrifuge. Numerical parametric studies were conducted using the validated finite element model. The parameters included were the depth and strength of the clay zone and the inclination of external load. It is shown that a relatively simple three-dimensional finite element model was effective in providing information that would be needed to design such a critical and expensive offshore structure. Basic Mohr–Coulomb strength parameters and moduli based on cone penetration resistance measurements and published empirical correlations were appropriate in modeling the soils in the finite element simulations.