Optimization method of portal steel structure
Similar to the optimization method of the grid steel structure, the optimization method of the gantry steel structure also adopts the asymptotic full stress method, that is, the gantry steel structure member chooses to modify its cross-sectional size through multiple calculation and analysis, so that it can reach or be as close as possible to full stress. Stress state, until the cross-sectional dimensions of all the members of the gantry steel structure do not need to be modified, so that the steel consumption of the gantry steel structure is minimized, so as to achieve the optimization goal of the lowest cost. The modification of the cross-sectional size of the component, that is, the optimization of the cross-sectional size, is to select the cross-sectional size so that the cross-sectional bending resistance moment in the plane and out-of-plane directions is the largest, and the cross-sectional area is the smallest, that is, under the action of external loads, The selection of the section size should not only meet the design strength requirements of the component materials in the strength and stability checking, but also minimize the amount of material used.
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