Study On Safety Performance Evaluation Method Of Floating Breakwater

Floatingbreakwater structure has the characteristics of convenient movement,low cost,little environmental impact.Strong adaptability and can alleviate the tension of land resources,with its high economic efficiency and wide application prospect.Floating breakwater needs to bear the effect of large wave load in the process of wave elimination,so the safety of floating breakwater structure is very important.In this paper,the characteristics of floating embankment,the characteristics of structural design and the characteristics of structural design are studied.The method of calculating the load of the main structure of the floating breakwater and the safety assessment method of the main structure are studied.The following research work is carried out:(1)Gives the evaluation of the structural safety of the floating breakwater,mainly for the safety of the main structure(main body,local strength and fatigue)of the floating breakwater,the mooring system(the evaluation of the joint tension,the mooring point as well as the strength of the mooring cable),and the safety of the connection structure.The evaluation method of body strength and local strength and the theory of fatigue strength are given.(2)The hydrodynamic model,the quality model and the structural model of the floating breakwater are established for the design of the double-cylinder floating wave embankment.According to the working area of the breakwater and the sea conditions,the first order wave excitation force and the six-degree offreedom motion response of the floating breakwater are forecasted.The method of wave load forecasting for floating breakwater is established.(3)Based on the structural finite element analysis software DNV/SESAM,the finite element model of the main structure of the floating breakwater is established.The direct strength calculation method is used to analyze the overall strength of the main structure of the floating breakwater.On the basis of this,the finite element model is established for the local structure with high stress,the local strength calculation and checking of the floating breakwater structure are completed,and the local configuration of the breakwater is optimized according to the stress distribution characteristics.(4)According to the specification of DNV on the structure of offshore structures,the fatigue conditions of fatigue breakage analysis are given.The SN curves and linear fatigue cumulative damage theory are used to calculate the fatigue life of breakwater under wave load.