Research On Strength And Strengthening Measures Of Double Buoyant Floating Breakwater

Floating breakwaters have the characteristics of convenient movement,low cost,small impact on the environment.However,the floating breakwater needs to bear larger wave load in the wave elimination process,so the safety of structure is a problem to be solved urgently.Compared with the commonly used steel materials of current floating platform,the reinforced concrete structure has the advantages of low cost,corrosion resistance and simple construction.Therefore,it has an important role in the practical construction and application of the following floating breakwater to study the structural strength of floating breakwater and to improve the structure of the reinforced concrete breakwaterIn this paper,the numerical simulation of the test beam is carried out.And compared with the test results to verify the feasibility of the simulation method to simulate the reinforced concrete material based on the typical constitutive relations and finite element theory of reinforced concrete materials.Taking the double buoyant floating breakwater with reinforced concrete as the research object,a preliminary design scheme of the main module of the floating breakwater was proposed.The material equivalence and failure judgment of each component were studied based on that.In the typical wave conditions of the ultimate form of damage to study.Then the ultimate failure mode of the floating breakwater under typical wave conditions is studied.Based on the calculation theory of wave load and the design wave analysis method,the strength of the floating breakwater under dangerous wave conditions is analyzed,and get the whole structure stress distribution and dangerous high stress area.Proposing measures for strengthening and improving the high stress area,and finally a set of design scheme of the floating-type breakwater with reinforced concrete to meet the strength requirements is formed.The main research contents are as follows:(1)The simulation method of reinforced concrete structure and strength theoretical analysis of floating breakwater structure.The theory of constitutive relation of reinforced concrete is studied.The numerical simulation of classic Bresler-Scordelis test beam is carried out by numerical simulation.The numerical simulation results are compared with the experimental results to verify the reliability of the simulation method to simulate reinforced concrete.The wave load calculation theory and floating breakwater strength analysis method are studied,and then the overall strength analysis and improvement design of thefloating breakwater structure are given.(2)The preliminary configuration design and failure form of reinforced concrete floating breakwater.Combined with the characteristics of floating breakwater and the preliminary test results of the subject,a preliminary design scheme of double buoyant floating breakwater based on reinforced concrete was proposed.The equivalent stress-strain curve of each component of floating breakwater was obtained by cross-section analysis theory.Then obtain the equivalent material failure to determine basis based on the environmental conditions of the structure of the operating environment.The failure form of floating breakwater under typical wave conditions is studied based on the static strength analysis method,which lays the foundation for the strength analysis of floating breakwater with reinforced concrete.(3)Study of structural strength of the reinforced concrete floating breakwater.First of all,according to the conditional modeling method(CMA)and the first inverse reliability method(IFORM),we designed once a century as the sea state.Secondly,short-term forecast results to determine the most dangerous wave and period of the designed wave parameters.On this basis,the hydrostatic and wave loads of the floating breakwater in the regular wave are calculated,and the external load is applied to the structural model.On this basis,the hydrostatic and wave loads of the floating breakwater in the regular wave are calculated,and the external loads are applied to the structural model.And the structural strength of the reinforced concrete floating breakwater is analyzed based on the corresponding combination coefficient to obtain the structural strength of the floating breakwater.The overall structure of the stress distribution to determine the bearing capacity of poor high stress areas;(4)Study of reinforcing measures of thereinforced concrete floating breakwater structure.Firstly,aiming at the high stress area with poor carrying capacity in the preliminary scheme.The strengthening scheme of components is proposed and compared,and then the better component forms that can meet the strength requirements are obtained.Secondly,considering the weight factors of floating breakwater structure.Finally,aiming at the hydrodynamic prediction and the calculation of improved overall structure of floating breakwater,the designed wave parameters were determined.And the structural strength of the floating breakwater was further studied,and then formed a set of design proposals to meet the strength requirements of reinforced concrete floating breakwater.