Design method and device of main arch structure

The invention discloses a method and device for designing a main arch structure of a wooden arch gallery bridge, and the method comprises the steps: determining the rise-span ratio of the main arch structure of the wooden arch gallery bridge and the diameter and length of the section of a three-section seedling under a certain span through employing the design method based on the traditional construction technology of the wooden arch gallery bridge and the modern engineering theory; and determining the positions of upper and lower calf heads and the diameter and length of the section of the five-section seedling according to the geometrical relationship. The method can economically, reasonably and reliably design the rise-span ratio, the seedling stem length and the section diameter of the main arch structure. The traditional wooden arch bridge construction technology has the problems of low reliability, limited basis, dependence on the experience of craftsmen and the like. According to an existing design met