Seismic Analysis of Composite Box Girders with Corrugated Steel Webs and Trusses

The concrete box girder is one of the most commonly used bridge structures due to its large flexural and torsional stiffness. For long spans, this will not be applicable since it increases the self-weight of the structure. To reduce the self-weight, steel–concrete composite bridges had been introduced. These steels have the potential to produce considerable weight savings, although a hindrance to their effective use in conventional stiffened flat web plate girders includes the potential for web instability, excessive deflections, and fatigue failure. To overcome the limitations, innovative designs have been proposed, including the use of corrugated webs to provide enhanced shear stability and eliminate the need for transverse stiffeners. This structure consists of a top concrete slab, corrugated steel webs, and two bottom concrete-filled steel tubes connected by trusses. The project work firstly studies the behavior of a pedestrian bridge and then continues with a road bridge and its seismic analysis using FEAST (Finite Element Analysis of Structures) software. The response spectrum method of analysis is used to evaluate the maximum deformation, and stress. Various parameters used for the study are thickness and diameter of concrete-filled steel tubes (CFST), corrugated web height, and corrugation length. A comparison between flat plate web and corrugated web is studied to confirm the efficiency of corrugated webs.