循环荷载作用下吸力式桶形基础承载性能的弹塑性计算分析

Elastoplastic analysis of bearing capacity of suction bucket foundation under cyclic load

海上风电建设作为未来风能开发的主力,将在我国东部广阔的海岸线地区快速发展。作为近年来出现的一种新的基础形式,吸力式桶形基础引起国内外学者的广泛关注。然而,海上风机结构物工作的海洋环境十分复杂,吸力式桶形基础结构不仅要承受整个风机的自重与工作荷载,还要长期受到海风、海流、海浪等循环荷载的冲击,若其承载性能不足将直接导致风机设施整体垮塌、结构破坏。因此,基于FLAC3D数值分析软件,建立吸力式桶形基础动力效应的三维力学计算模型,研究吸力式桶形基础在竖向、水平、弯矩、扭矩四种单向循环力作用下的极限承载力特性,为海洋基础结构设计与施工提供理论参考。

As the main force of wind energy development in the future,offshore wind power construction will develop rapidly in the vast coastline area of eastern China.As a new form of foundation that has emerged in recent years,the suction bucket foundation has attracted extensive attention from scholars at home and abroad.However,the offshore wind turbine structure is very complicated to work in the marine environment.The suction bucket foundation structure not only bear the weight and working load of the entire wind turbine,but also suffer from the long-term impact of cyclic loads such as sea breeze,ocean currents,and waves.It will directly lead to the overall collapse of the wind turbine facilities and structural damage.Therefore,based on the FLAC3D numerical analysis software,a three-dimensional mechanical calculation model of the dynamic effect of the suction bucket foundation was established to study the ultimate load of the suction bucket foundation under the action of four unidirectional cyclic forces of vertical,horizontal,bending moment and torque.The force characteristics provide an important theoretical reference for the design and construction of marine foundation structures.