Matrix Displacement Method for Concrete Filled Steel Tubular Arch Structures

Regarding the concrete filledsteeltube asa compositematerial, thispaperproposesa newmatrix displacement method for analyzing concrete filledsteel tubular archstructures. On the basisof sub-structure analysisof crosssectionsby space finite elementmethod, spacesub-elementsare transformed tobeamelementsofmatrix displacementmethodby plane section hypothesis. Thereby the stiffness matrix of the beam elements is obtained. If further researched, the method can be applied to nonlinear analysis of these arch structures.