| The elevated group pile caps foundation of ocean engineering structures is under a lot of changing loads in service period in the cold region in winter, and wave load is the most basic dynamic load. The ice load is another important load which has great effect on the internal forces of the elevated pile caps foundation. S o it is necessary to analyze the internal forces of the elevated pile caps foundation under the wave and ice load. The elevated group pile caps foundation is under many complex forces, and the calculation is trival. Thus simplifying the pile internal force calculation is particularly important for engineering structural design. The main research contents are as follows:(1) Based on the mechanical characteristics of the elevated group pile caps foundation. The elevated group pile caps foundation calculation model is Simplified in plane. Considering the effect of lateral rigidity by other piles, a simplified group pile calculation model is put forward, and then derive the internal force calculation formula under the action of horizontal force at the free part. Comparing with the results of numerical simulation, two results are roughly the same. The simplified calculation method can be used as a reference in engineering design. What is more, at the basis of M-method the internal force calculation formula under the action of horizontal force at the free part is derived.(2) A single elevated pile cap calculation model is established by the finite element software ANSYS, and the cyclic dynamic stress is applied to the calculation model to simulate the interaction of the elevated pile cap and the soil under the wave and ice load. The bending moment, shear force, axial force and displacement distribution of the pile are obtained under the wave and ice load.(3) Different finite element model is established by changing the model parameters which vary with the depth of embedment, pile diameter, pile free length. Then the influence by the depth of embedment, pile diameter, pile free length on the internal force and deformation of the pile foundation is analyzed. |
