International Journal For Multidisciplinary Research

E-ISSN: 2582-2160   •   Impact Factor: 9.24

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Optimizing Bridge Design for Economy: a Comparative Study of Concrete, Steel and Prestressed Girders in Sap2000

Author(s) Mr. Dhairya Kathore, Prof. Sanjay Limbodiya, Prof. Priyanka Rajput
Country India
Abstract This project presents a comparative structural analysis of cable-stayed bridges utilizing different deck configurations: steel, concrete, and prestressed concrete girders. Using SAP2000 software, the study evaluates a 120m multi-span bridge (20m - 80m - 20m) to determine the influence of material choice and construction methodology on structural performance.
The investigation focuses on two primary construction scenarios: un-supported (unshored) and sup-ported (shored) spans. In the un-supported case, the initial deflection and stresses are analyzed during the pre-composite stage, whereas the supported case considers the full composite action resisting total loads upon the removal of temporary supports. Key performance indicators, including maximum flex-ural stresses, shear forces, and bending moments, are compared across the different materials.
Furthermore, the study reviews the economic viability of various girder shapes (T-beam vs. Box girder) and the impact of deck skewness on analysis methods, noting that finite element method (FEM) is re-quired for skews exceeding 25°. The findings aim to provide a technical and economic basis for select-ing optimal bridge deck systems based on span requirements, life-cycle costs, and construction con-straints as per IRC: 6-2000 and AASHTO LRFD standards.
Keywords Cable-stayed bridge, SAP2000, Composite construction, Prestressed concrete, Structural analysis, Shored vs. Unshored construction.
Field Engineering
Published In Volume 8, Issue 2, March-April 2026
Published On 2026-04-17
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E-ISSN 2582-2160
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