Reinforced concrete arch technology has been extensively used in middle-span and long-span bridge design because of the features such as its high integral stiffness, making full use of the material property, with great ability of span and its light and graceful appearance etc. In this paper, on the basis of the design proposal of Weihegou Bridge which is a 115m main span deck-type reinforced concrete X-arch bridge, the FEM software MIDAS/CIVIL is introduced to establish the spatial finite model of bridge wi...