Volume 4 Issue 2
Simplified Model for Penetration Depth Analysis of Extra-Large Concrete Caissons During Construction
Authors: Wang Hong-Xia; Samuel W. Chung
Abstract: Large concrete caissons are widely used in civil and ocean engineering. It is very important to keep caissons penetrate evenly and safely in the launching process. It is necessary to establish a suitable mechanical model to predict the penetration depth in the excavation. In this paper, a general multiple degree mechanical model is derived. The relationship between the penetration depth and the excavation amount are obtained. The model predicts the relationship between the penetration depth and the excavation. The numerical results obtained by the model are compared with those measured at the construction site. The results prove that they are in good agreement with the measured data, suggesting that the present model can be effectively applied for engineering predictions.
Keywords: Large Extra Concrete Caissons; Simplified Mathematical Model; Penetration; Excavation; Runge-Kutta 4 Order Method
Authors: ZHAO Ming-jie; HU Dan-ni; HE Ye
Abstract: Mono-pile foundation of offshore wind turbine was simulated using ANSYS finite element software, conducted quasi-static analysis of the foundation of the offshore wind turbine considering the interactions of environmental load, such as wind, wave, current, etc, optimized the size of the pile based on zero-order method. The wall thickness of the pile was reduced under the premise of ensuring displacement, stress, and stability requirements, the total volume of the pile foundation decreased by 33.5% in order to reach the aim of light-duty design; Combining with the variation of the objective function, design variable and state variable in optimization process, proposed that the displacement of pile top is the primary limiting condition, the optimization of shape topology should be taken into consideration while designing the structure; The wall thickness in some parts of the pile foundation can be appropriately reduced to make full use of the strength of the material, under the premise of ensuring top pile displacement.
Keywords: Offshore Wind Turbine; Mono-pile Foundation; Zero-order Optimization Method; Size Optimization