Analysis and Design of Simply Supported Pre-Stressed Precast-Cast In-Situ Concrete Composite Railway Bridges: Comparison of Ballasted and Slab Track Alternatives
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Date
2015-03-12
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Addis Ababa University
Abstract
Bridge is one of the most important components of railway line for development of
transportation. It is known that Addis Ababa light rail transit project construction
started two years ago. Also the construction of national railway project started. In
these projects, the construction of bridges need highly skilled man power and highest
construction cost.
The railway bridge commonly contains two types of tracks which are ballasted and
slab track. There is a difference in construction cost of bridge between ballasted track
case and slab track case.
Thus, this study has attempted to analyze, design and compare both ballasted and slab
track type laying on the surface of bridge. This study mainly focuses on the
superstructure of bridge supporting track rails attached to the bridge to support
trains.
The intention of this thesis is therefore to compare the construction cost of railway
bridges with ballasted and slab track cases and to select the economical track type
laying on the surface of railway bridge.
Finally, from the overall analysis result of this thesis, the study conclude that slab
track is economical than ballasted track for span length greater than 15m. On the
other hand, ballasted track seems economical than slab track for span length less than
15m.
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Keywords
Pre-Stressed Precast-Cast, In-Situ Concrete, Railway Bridges, Ballasted and Slab Track Alternatives