Hydro Dynamic Response For A Single Pile Under Nonlinear Wave Loads Stimulation

With the continuous development of marine engineering,the sea isolated pile structure with the advantages of 'simple process,applicability,reasonable cost' has been widely used in a variety of port and coastal engineering such as Offshore wind turbines,tidal power,berthing and anchorage of floating structures,etc.For sea isolated pile structure,the wave power is an important dynamic factor which often makes piles have a greater response,therefore,the dynamic research that the wave act on the pile has important significance.This paper calculated the power spectrum of the isolated piles systems in five kinds of condition,respectively,based on linear,second,third,and fifth-order stokes wave theory,analysis the influence with wave height,period,water depth,tide and wave spectrum changing.The main contents and conclusions are as follows:The external environment such as wave height,period,water depth,are likely to impact the calculation of power spectrum lead to the high wave spectrum mean square value,among them,the greatest impact of wave height,period of second,and finally the depth of water.When the period and depth of change,even though the load spectrum is not significantly enlarged,but the structure may also have a greater response due to the frequency response function changes.The wave theory result differences law between second-order,third-order and fifth-order and linear wave theory as follows: The calculation results of linear and second-order have significant difference,and the calculation results of five-order calculation results between the second-order and linear wave theory.the results of the fifth-order wave is always in between the second and third order results.In a larger wave height,period and relatively small depth deeper,the calculation results of different wave theory have a greater difference,this time should not continue to use the linear wave theory calculations.When the diameter changes,external and intrinsic properties of the wave loads are piles will change,piles mean square response will always be some optimal range,smooth response to the interval and relatively small.The main impact of the current wave of resistance and load resistance torque at a relatively large flow rate of resistance load some amplification.Meanwhile,the selection of different wave spectrum of the spectrum will have a greater impact on dynamic analysis and calculation,the actual project should be combined with the geographical features and external conditions,a reasonable choice of wave spectrum in the form of calculation used.