Nonlinear hydrodynamic pressures generated by a moving high-rise offshore cylinder |
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| Authors: | Bang-Fuh Chen Chen-Feng Huang |
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| Institution: | Department of Marine Environment, National Sun Yat-Sen University, Kaohsiung, Taiwan R.O.C. |
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| Abstract: | Both analytical (small time expansion) and numerical (finite-difference) approaches have been used to solve the earthquake-induced nonlinear hydrodynamic pressure acting on a rigid high rise offshore cylinder. For the high rise offshore cylinder, the most part of the flow field is independent of z and a three dimensional hydrodynamic analysis can be reduced to a two dimensional analysis. At onset, the dimensionless ground displacement ?2 = 0 for the two dimensional analysis, the normalized hydrodynamic pressures across cylinder face is a constant and is independent of the radius of the cylinder. The normalized horizontal force coefficient Cfx is independent of intensity of ground acceleration and is approximately linear and proportional to ?2 and its onset value is equal to π. For a linear analysis i.e. neglecting nonlinear convective acceleration, the normalized hydrodynamic pressure coefficient is also independent of the radius of cylinder. The analytical method was good for ground motion in a single direction, the results of simultaneous action of two components of ground acceleration can be obtained by the superposition of the results due to separate excitation. But the superposition method is only valid in the linear analysis. For highly nonlinear problem, the present finite difference approach is recommended. |
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