Analysis On The Influencing Factors Of The Force Performance Of Radial Steel Gate Based On Component Cooperation

With the continuous improvement of China's dam construction technology,dam projects above 200m have been built one after another,and the size of the orifice of the discharge strecture has also increased.Therefore,the use of curved steel gates has become an optimal way to ensure the normal operation of the water conservancy project select.Radial steel gate has many advantages,such as light structure,reasonable stress,convenient opening and closing,good flow state,etc.,but the arc steel gate is a very complicated space system under stress,the thickness of the panel,the main design parameters of the main bean and the main The layout of the frame and other factors will have an impact on its working performance.The traditional plane system design method is relatively rough to calculate the structure of the arc gate.Therefore,the combination of the plane system design method and the space system design method is used to study the main bearing components of the are steel gate.(Panels,main beams and arms)are necessary.This article is based on the cooperative work of components,and the three-dimensional numerical simulation method is used under the condition that the overall stability meets the requirements.The calculation and analysis of the selection of the elastoplastic adjustment coefficient of the curved steel gate panel,the influence of the main beam design parameters on its own components,the optimal beam height of the main beam and the layout of the main frame structure are the current steel gate design specifications for reference.The main research contents and results include:(1)Compare the similarities and differences between the selection methods of the elastoplastic adjustment coefficients given in the specifications and related literatures,and then improve the selection methods given in the relevant literatures,and calculate and analyze the effects of different elastoplastic adjustment coefficients on the strength of the components Changing the elastoplastic adjustment coefficient has a greater impact on the face plate and the secondary beam,and has little effect on the primary beam.When selecting the elastoplastic adjustment coefficient,it is necessary to consider the joint effect of the ratio of the long and short sides of the cell and the overall bending stress of the beam.The absolute value of the error obtained by the elastoplastic adjustment coefficient obtained in this paper and the related literature is no more than 3%,which is simple and convenient(2)Using the global sensitivity analysis method,the influence of design parameters such as flange width-thickness ratio,web spacing,and web height-thickness ratio on the strength of each member of the main beam of the arc gate was studied.The results show that the parameter that has the greatest influence on the stress on the upper flange of the main beam is the flange width-to-thickness ratio,which has a negative correlation;the parameter that has the greatest influence on the stress on the lower flange of the main beam is the web spacing,which has a positive correlation;The biggest parameter is the web height-to-thickness ratio,which has a negative correlation(3)By assuming a dimensionless expression,the beam height of the double cantilever type main beam is studied.The results show that for complex structures such as steel gates,it is necessary to consider the spatial cooperation of the main beam and other components,and there is an optimal beam height between the minimum beam height and the economic beam height The ratio is about 0.868,the beam height can minimize the stress of the main beam member.(4)Using the principle of equal water pressure and controlling the cantilever length of the main beam,the position and layout of the main beam and the arm of the three-arm main frame are studied.The results show that when the grid is arranged on the same floor and the support arm is connected to the main beam,the support arm should be arranged at the total beam span of 0.208 times the end of the main beam.For the location of the main beam,the principle of equal water pressure can be adopted,and the middle main beam should be arranged on the line of total hydraulic pressure.The mid-main beam is approximately 0.222 times the panel arc length.(5)Through the buckling analysis method,the arrangement of the chord and the web of the support arm is studied.The results show that placing chords and webs between the three main beams of the support arm can improve the anti-buckling ability of the support arm and increase the overall stability of the support arm.When the number of chords is increased,the critical load of the arm destabilization increases,but too many chords will increase the weight of the arm.Therefore,in the actual selection,comprehensively consider the selection of economy,strength and rigidity.When continuing to arrange the web rod,the critical buckling load of the arm can be further increased.The shape of the web rod should be arranged to be triangular with the chord and one of the angles is oriented in the same direction as the water pressure.