ZHOU Xiaojie,LI Na,LU Liqiang,et al.Finite Element Analysis on Bearing and Deformation Behaviors for Large⁃diameter Monopile under Lateral Cyclic loads[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(06):1279-1286.
ZHOU Xiaojie,LI Na,LU Liqiang,et al.Finite Element Analysis on Bearing and Deformation Behaviors for Large⁃diameter Monopile under Lateral Cyclic loads[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(06):1279-1286. DOI: 10.13409/j.cnki.jdpme.201908001.
Finite Element Analysis on Bearing and Deformation Behaviors for Large⁃diameter Monopile under Lateral Cyclic loads
Large-diameter monopile is one of the foundations that are widely used in offshore wind power industry. It is of great significance to study the bearing and deformation behaviors of large-diameter monopile under lateral cyclic loads such as wind, wave and flow. Numerical simulation on the existing centrifugal model tests for large-diameter monopile is carried out by establishing a three-dimensional finite element model of pile-soil interaction based on the ABAQUS software. A cyclic elastic-plastic constitutive model is used to describe the cyclic stress—strain responses of soils around the pile during numerical calculation. The finite element analysis method capable of tracking the displacement-time history of the large-diameter monopile in sands under lateral cyclic loads is established by calling the UMAT subroutine of the model and setting appropriate pile-soil contact conditions, analysis step and calculation parameters. By comparing with the model test results, the established finite element analysis model can describe the deformation process of pile under lateral monotonous and cyclic loads in sands, and reflect the nonlinearity, hysteresis and displacement accumulation characteristics of cyclic load-displacement curves. Besides, the distribution characteristics and variation law for the bending moment and displacement of pile with the increase of the number of cycles can be predicted.
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