The Connection Types,Seismic Behavior And Building Cost Of Floating Structures

As a new type of engineering project that utilizes marine resources and space,the assembled floating structure plays an increasingly important position in the academic and engineering fields.At present,in the dynamic response analysis of the assembled floating structure,first of all,the comprehensive consideration of dynamic water pressure acting on the structure and the pile-soil interaction has not been fully considered;Secondly,the influence of the connector on the dynamic response of the assembled floating structure remains to be further studied.Based on this,this paper uses a new type of assembled floating structure to analyze the dynamic response of the finite element numerical model after considering the dynamic water pressure and the pile-soil interaction problem,this model is assembling four single floating bodies.Firstly,this paper discusses the development status and research ideas of the assembled floating structures:their connectors,dynamic pressure,and pile-soil interactions.This paper introduces the new type floating structure of the paper;the constructure design scheme,transportation and construction of this new type of assembled floating structure are introduced.Secondly,this paper introduces the mass method based on Morrison equation in detail;Introduced the P-y curve method considering pile-soil interaction;The whole process of finite element modeling is introduced: material constitutive and damping,unit selection,constraints and external loads,mesh division,time step,and seismic wave selection;Detailed description of the application of the additive mass method considering group pile effect and rectangular section equivalent.Then,introduced three connector methods used in this thesis: welding,bolting,and pin hinged connection;detailed description of the connection method finite element modeling process and parameter settings;based on three different connectors,analysis of the seismic performance of the assembled floating structure;and propose the seismic evaluation index of the connector.Then,the seismic performance of the assembled floating structure is studied in this paper: the modal analysis of the structure,including the number of assembly,dynamic water pressure,the pile-soil interaction on the modal parameters;the effect of different seismic waves on the assembly floating structure,The dynamic response of the structure is studied;then the influence of dynamic water pressure and pile-soil interaction on the seismic response of the assembled floating structure is discussed;then the seismic influence of different water levels and adjustable buoyancy on the assembled floating structure is considered.Finally,this article compares the structure on the assembled floating structure with a land structure: through the different input of different seismic waves,the dynamic response laws of the structure and land structure are compared and analyzed;and the seismic performance of the structures between the structure on the assembled floating structure and land structure was evaluated quantitatively through proposing the concept of Seismic performance improvement factor;comparative analysis of the construction cost and space utilization of structures and land structures,and pointed out the advantages of the construction of assembled floating structures.