Experimental Study Of Jacket Leg Axial Compression Performance And Stability Analysis Of Novel Jacket Platform

With wicked environment of the jacket offshore platform,the corrosion of seawater will cause the wall thickness of the platform members to become thinner.In the Bohai Bay of the platform,it further aggravates the risk of platform collapse under the ice load in winter.As a complex space steel truss structure,the platform is unimaginable in the event of structural instability.It can be seen that the corrosion,ice load and structural stability of seawater are closely related to the safety,reliability and usability of the platform,which also determines the personal safety and working environment of marine workers.In order to ensure the safety and normal use requirements of the offshore platform structure of the jacket,a novel concrete-filled double skin stainless steel tubes of offshore platform structure is proposed in this paper,which can improve the corrosion resistance of the structure and effectively reduce the platform's ice load,at the same time the overall stable bearing capacity of the platform can be improved.As an important component of the structural system of the offshore platform of the jacket,the jacket leg is directly related to the bearing capacity and deformation capacity of the novel concrete-filled double skin stainless steel tubes of offshore platform structure.To this end,this paper studies the mechanical properties of the jacket legs as the starting point,useing numerical analysis and experimental research to study the axial compression performance of the concrete-filled double skin stainless steel tube jacket legs,stabilizing the structure of the novel concrete-filled double skin stainless steel tubes of offshore platform.Sex analysis,the main contents are as follows:(1)The finite element model of concrete-filled double skin stainless steel tube jacket leg is established.By analyzing the influence of hollow rate,concrete strength and thickness-thickness ratio on axial bearing capacity,the axial bearing capacity is related to the hollow ratio,concrete strength,diameter-thickness ratio.reducting of hollow ratio and diameter-thickness ratio and improving of concrete strength,the bearing capacity of the specimen is improved.(2)The axial compression test of 17 concrete-filled double skin stainless steel tube jacket leg was carried out.At the same time of verifying the numerical model,the failure mode and mechanical properties of the specimens were analyzed with parameters such as hollow ratio,concrete strength,ratio of diameter to thickness and material.influences.The test results show that the deformation of the test piece is related to the hollow ratio,concrete strength,diameter-thickness ratio and material parameters,and the influence of each parameter on the mechanical properties of the test piece is obtained.The concrete-filled double skin stainless steel tube jacket leg has higher bearing capacity and Good ductility performance.(3)Using the unified strength theory,the formula for calculating the axial bearing capacity of the concrete-filled double skin stainless steel tube jacket leg is obtained.(4)Based on the finite element software ANSYS,a novel type of concrete-filled double skin stainless steel tube jacket leg of offshore platform model and JZ20-2 offshore platform model were established respectively.Static linear eigenvalue buckling analysis was performed on the two platforms to obtain the buckling modes of the two.The buckling critical load indicates that the novel concrete-filled double skin stainless steel tube jacket leg of offshore platform has the advantages of high stability bearing capacity.