Truss bridge structure analysis by using Finite Element Method

Abstract

The Purpose of this investigation is focused on alerting structural engineers to the possible distortions, associated to the steel and composite bridge service life, when subjected to vehicles dynamic actions. In this study, effort has been made to analyse two types of bridge structure i.e. Pratt truss & lattice truss with two different sections (‘I’ Section & ‘C’ Sections) by applying various loads at the nodes of the frame of two trusses. This work focuses on the analysis of truss bridge structure which is most widely used in steel bridge as railway and pedestrian crossings. The basic emphasis has been given to check the total deformation and direct stresses between two types of bridge structure with ‘I’ Section and ‘C’ section. Eight node solid element is selected and meshing is done individually for
each modal. The material property of each material is selected as per literature database in Ansys software. The modal analysis in Ansys is completed to atta.in the total deformation and mode shapes of bridge structure to stay away from the failure of the bridge. As per study, we found out that, the major variations in truss structures. Pratt truss have less deformation and stresses as comparison to lattice truss. And minor variations have found in ‘c’ section with less deformation and stress, in both Pratt bridge truss structure and Lattice bridge truss structure