Abstract
The static analysis on large span portal frames with variable section is carried out in this paper. Because portal frames process with two dimensional stress characteristics, single hinged portal frames model is adopted by the finite element software ANSYS and the most value of internal force, stress, displacement and distribution of the single hinged portal frames model is got by the static analysis under different load combinations. At last, the results show that the structure can meet requirements of the intensity conditions and deformation limits. And the influence of the internal force, stress and deformation which are generated by constraint form of the column feet and depth-span ratio of the frame is discussed, these can provide reference for similar variable section actual engineering.
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