Dynamic Analysis Of Box And Bucket Foundation Structure

Box-Bucket structure,suitable for soft foundation,can be used to build breakwaters,wharves and dams.With the development of construction in deeper water,the conditions of structures are also increasingly harsh and changeable.The dynamic response of structure under complex loads such as wind,wave,current,ice and earthquake,has become a problem that we must focus and need to be solved urgently.In this thesis,a series of research work were carried out on the dynamic response of the Box-Bucket foundation structure by the numerical simulation.Firstly,combined with the practical engineering problems,the numerical model of the Box-Bucket foundation structure was established,then the model’s reliability was validated by observation data.The vibration characteristics were analyzed,and the results showed that the resonance would not happen.The principles of plane equivalence about the overall model of structure-foundation were put forward.The influence of foundation soil constitutive model selection on the results of the dynamic analysis was explored,and the plastic deformation of soil should be considered when the load amplitude was large.Secondly,the structure response under the action of wave was analyzed: the time-history curve of random wave load was obtained through the operation of programming language,then the structure dynamic response was analyzed under either of the sinusoidal load and random load,and the maximum structure amplitude was 16 mm,which completely met the requirement.The coupling model of wave-structure-foundation was established,and its coupling response process was simulated,the coupling results were smaller.The calculation results of the static and dynamic response were compared,the maximum relative difference was 17%.Thirdly,the structure response under ice load was analyzed: the ice load parameters on structure were obtained by the modified Matlock ice force model,and its transient response under ice load of different velocity was analyzed,the maximum horizontal displacement was 29 mm,which could meet the requirement.The calculation results of the static and dynamic response were compared,and the dynamic displacement of up structure was larger,where the vibration phenomenon was serious,the biggest dynamic magnification coefficient was 3.82.Fourthly,the structural seismic response of structure-foundation overall model was analyzed using the method of time-history analysis: the time history response was analyzed under either of measured earthquake acceleration record curve and artificial time history curve of the seismic wave acceleration.The maximum displacement was 152 mm,and the maximum rotation angle was 0.016 °,which showed that the integral translation was more dominant,the rotation was small,and the damage would’t occur.Fifthly,the influence factors of the dynamic response of the Box-Bucket foundation structure were preliminarily explored and analyzed,the structural plane dimension,parameters of soil and load amplitude had great influence on the dynamic response.In summary,this thesis did some analysis and research on the dynamic response of Box-Bucket foundation structure under the action of wave,ice and earthquake.The results showed that both of the structure displacement and stability met the design requirements,which opened up a new road for the dynamic response analysis of Box-Bucket foundation structure.