Research On Lifting Scheme And Process Mechanics Of Large Container Ship Superstructure

In recent years,the global economy has continued to decelerate,and the shipping industry has been in a downturn.The growth rate of global trade volume is even slower than that of the world economy.Countries have entered the era of low trade.Therefore,the shipbuilding industry is becoming more intelligent and efficient,which puts forward higher requirements for shipbuilding.Only by continuously increasing the speed can we really achieve the goal of shortening the shipbuilding cycle and improving shipbuilding efficiency.As a relatively independent structural module,the ship superstructure ensures its integrity and finished product,which will undoubtedly to increase production efficiency,shorten the construction period of the ship,and reduce the construction cost of the ship.In order to avoid the deformation of its structure and outfitting components,the lifting strength of the superstructure needs to be analyzed in advance.Taking 11800 TEU container ship superstructures as the research object,the paper studies the hoisting of superstructure buildings from the aspects of hoisting scheme design and process mechanics respectively,and analyzes the requirements of the design scheme in various aspects,such as lifting lugs combined with surface contact characteristics,stiffener plate buckling characteristics,structural strength and structural deformation control during hoisting,and get the following conclusions.(1)Design of lifting scheme for ship superstructure.According to relevant literature,lifting requirements and lifting capacity of shipping companies,this article discussed the superstructure of hoisting,lifting lugs or lug choice as well as lifting point arrangement and so on.(2)By use of ABAQUS finite element software to study the strength of the lifting lugs,and analyze the influence of various factors on the calculation results,and determine the maximum stress and maximum deformation area of each type of lifting lug under the design load.As well as calculating the limit load of the lifting lugs,the design load is 4 times higher than the ultimate load of the lifting lug.In the actual lifting operation,the lifting lug is safe and reliable when the design load is the operating standard.(3)Taking the stiffened plate structured between three vertical beams as the research object.Calculate its buckling strength under different loads,and draw the load displacement curve and element stress component curve,and analyze the influence of each component on the deformation of the stiffened plate.(4)By use of ANSYS finite element analysis software,the article analyzes the structural response from the action of self-weight of the superstructure and the structural response from lifting.The analysis found that using the four lifting schemes designed,the high stress area of the superstructure during the hoisting process is mainly concentrated around the hoardings that are in contact with the hangers.The large deformation area is mainly distributed among the doors corners,windows corners,and stairways corners of the decks and walls of the various floors,large span beams and cantilever structures.In hoisting,each part needs to be strengthened according to the actual situation.In the four schemes,the front and rear arrangement of the lugs can well control the stress level of the superstructure,and the method of arranging the lugs to the left and right has a greater impact on the structural deformation than other arrangements.