Economical Analysis and Design for The Selection of A Pre-Stressed T–And Box Girder Railway Bridges

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Addis Ababa University


A bridge is an important part of a transport network since it involves a lot of money, effort and required during railway construction project. Girder bridges are by the far the most common of all bridges types nowadays and using pre-stressed concrete instead reinforced concrete is a way to obtain a lighter structure self-weight particularly when designing a railway bridges because of their heavier loads in counter part of the highway bridges. The aim of this thesis is to develop a useful excel sheets for analysis and design and finally perform the selection of an economical types of bridges whether a pre-stressed Tor Box-girder taking construction cost as basis of comparisons. The designed bridges have the lengths between 20 and 30 meters because the expected demarcation point is located in this range and the AREMA recommendations have been considered. There will be some limitations in the calculations for example post-tensioned system is used, the bridges are supposed to have straight track and are considered simple supported. The developed sheets are illustrated using particular examples of both T- and Box-Girder bridges. The conducted comparative study based on the prevailing rates of construction cost as main comparator in order to identify the economical span range of the both superstructures girders revealed that pre-stressed T-girder is economical up to 24m and that of the Box-girder is economical beyond 24m.



Bridges, T-girder, Box-girder, Excel, Pre-stressed, Railway