Study On The Stability Of Vertical Steel Plate Silo Under The Action Of Grain Load

Owing to the advantages of its high strength, low cost, basic requirements of the base, easy construction, etc., Assembled steel plate silo has been widely applied to various fields. Circular steel silo is a rotary shell structure, whose stability analysis has long been the focus of the study for the national experts and scholars. In order to imp- rove the carrying capacity of steel silos structure, vertical stiffeners is often set evenly around the warehouse wall, making it the only component of vertical bearing. Floor-steel silos damage accident may happened during practical engineering project, and the common damage form is the instability of vertical stiffener under the effects of v- ertical load. It is in this case that we need to make further researches on the stability of floor-steel silos vertical stiffeners.Based on the Code for design of grain steel silos(GB50322-2011), this paper aims to design a test model with vertical stiffening rib cage, referencing other specifcations.The test model warehouse vertical stiffener is a four order variable section column, while our existing design of steel structures is limited to calculating the length coefficient of first order variable section column or two step variable section column. Therefore, based on the former researches, this paper deduced the length coefficient formula of four order column method. It also compiles a part of coefficient table of the length coefficient formula of four order column method, which is divided into two types: the upper part of the capitals is free or is rigid connection movable. This design is applied in practical works for reference and use.Adopting the case of the upper part of the capitals is free, this paper references the vertical stiffener cross-sectional dimension designed under the existing normative theory, calculates the length coefficients of each segment, which calculates and esta- blish the vertical stiffener inverse models, applying the MATLAB software based on the deducted length factor formula of four order column method. This paper also co- mpares and verifies the correctness of Four order buckling equation, which provides the basis for theoretical analysis. Moreover, it verifies whether the vertical stiffener meets the strength and stability based on the length factor.In this paper, according to the cross-section form of the existing norms theory to have designed the vertical stiffeners, the unconstrained capitals at the upper end are respectively in accordance with the derivation of the fourth order column calculation length coefficient formula and by using MATLAB software operation,we can establish vertical stiffener buckling analysis model.Finally we can back calculate the calculati on length coefficient values.Comparing it with verify correctness of column buckling equation of fourth order, then it provides the basis for the theoretical analysis.According to the Technical code of cold-formed thin-wall steel structures(GB50 018-2002) which given in the stability calculation method, combining the derived calculation length coefficient, and checking according to the Code for design of grain steel silos(GB50322-2011)which design of the vertical stiffener that meet the strength and stability requirements, which can give suggestions for practical engineering.