Study On Seismic Response Mechanism Of Steel Silo Model Under Different Working Conditions

Steel silo is a general structure widely used in food,energy,building materials,metallurgy,coal,food and other industries.Compared with reinforced concrete silo,steel plate silo has the advantages of light weight,short construction period and convenient mechanized production,etc.Its green advantages are of great significance to promote the goal of "double carbon".Therefore,the seismic performance and dynamic response mechanism of steel silo is a scientific problem that needs to be solved,and its research has important theoretical significance and engineering application value.In this paper,the finite element model of steel plate silo was established by designing a scaled-down model with a similarity ratio of 1:12 based on the similarity theory principle and relevant shaking table test research results,and the accuracy of the model was verified in terms of model mode and lateral pressure calculation results.The dynamic response and seismic performance of the steel plate silo model under different working conditions are studied,and the acceleration,displacement and lateral pressure change rules under different working conditions are revealed.The dynamic lateral pressure overpressure coefficient of steel plate silo is calculated and compared with the specification,and the results show that: 1)the maximum relative displacement and dynamic lateral pressure increase with the increase of peak input acceleration;2)the maximum relative displacement and dynamic lateral pressure increase with the increase of storage material,and the acceleration amplification coefficient decreases;3)under the action of earthquake,the acceleration of storage material is much larger than the acceleration of silo wall,and the farther away from the silo wall,the greater the relative acceleration of storage material and silo wall.The farther the distance from the bin wall,the greater the relative acceleration between the storage material and the bin wall.According to the results of the study on the dynamic response of steel plate silo under earthquake,the following suggestions are made for the design of steel plate silo,which provide reference for the specification revision and practical engineering application: 1)Through the displacement analysis,it is found that the ring beam can effectively reduce the relative displacement mutation phenomenon along the height direction,and it is suggested to add the ring beam at the relative displacement mutation position,mainly including the junction of supporting column and silo wall,the top of stiffening rib and other stiffness mutation positions.2)Through the(2)the acceleration analysis found that the maximum position of relative acceleration between storage material and bin wall is located in the center of steel bin,and the greater the stiffness of bin wall,the greater the relative acceleration between storage material and bin wall,in order to reduce the relative acceleration between storage material and bin wall in the middle part,stiffening ribs should be added in the middle of bin wall,and it is recommended to use high strength and low stiffness materials;(3)the analysis of side pressure found that the maximum value of dynamic side pressure increase and decrease under different working conditions are It is suggested that the stiffening ribs should be set along the whole height of the bin wall as far as possible to avoid the stress concentration in the middle of the bin wall.