Computer Program For Comparative Study Of The Analysis And Design Of Reinforced Concrete T-girder And Box-girder Bridges

Bridges affect people. People use them, and engineers design them and later build and maintain them.rnBridges do not just happen. They must be planned and engineered before they can be constructed.rnPlanning and designing of bridges is part art and part compromise, the most significant feature ofrnstructural engineering.rnDesign standards recommend span lengths to be the basic criteria for selecting bridge types, such as T-orrnBox-Girder bridge. Ethiopian Roads Authority (ERA) bridge design manual recommends reinforcedrnconcrete T-Girder bridges can be economical for spans from 12 to 20m and Box-Girder bridges for spanrnlengths of between 30-90m. According to Addis Ababa City Roads Authority (AACRA) bridge designrnmanual of 2004, the recommended span length range for a reinforced concrete T-Girder bridge is 10 - 20mrnand that of the Box-Girder bridge is 15-35m.rnIn some design standards, such as AACRA bridge design manual of 2004 and AASHTO bridge designrnspecifications of 2005, overlap in there recommendation of economical span range for T-Girder and Box-rnGirder bridges have been perceived. Furthermore, inconsistency in selection of the bridge type based onrnprovided span length is also verified while conducting the site visit for this study. Hence, identifying arnclear demarcation of span length for selecting the bridge type (T- / Box-Girder), on the basis of economy,rnhappens to be found indispensable.rnThis study basically concentrates on developing a computer program using “FORTRAN 95” programmingrnlanguage software for analysis, design, and cost estimate of superstructures of reinforced concrete TGirderrnand Box-Girder bridges. As a result, it come up with a solution for the design problems associatedrnwith the economical span range of the two types of bridges.rnA comparative study on the basis of cost of materials (construction cost) is conducted to select andrnidentify the economical span range of T-Girder and Box-Girder bridges. The developed program isrndemonstrated using particular examples of both T-Girder and Box-Girder bridges.rnThe study has procured a solution to benefit clients, consulting firms and contractors working in roadrninfrastructure sector in the design and design review (checking) process.

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