old and cusp catastrophe models of symmetric and antisymmetric instability of the circle arc double arcuated arch, under radial uniform load, are established.

Regarding the double hole two hinged arch culvert pier and top arch as a massive structure,considering the synergetic effect and elastic formation of pier and top arch and based on Winkers Hypothesis,the paper puts forward the hypogene calculation of double hole two hinged arch culverts massive structure according to the principle of force method.

Design and analysis of A Full-type arch hinge;