Browsing by Author "Misiker, Jemberu"

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    Economic Analysis and Design for the Selection of Two Units of Single Cell and One Unit of Double Cell Pre-stressed Box girder Railway Bridges
    (Addis Ababa University, 2015-10) Misiker, Jemberu; Abrham, Gebre
    Currently, railway transport system is being the most efficient, environmentally friendly, space-saving means of land transport system. Due to the new technologies and innovations made to such way of transporting goods and passengers, a lot of studies and documentations are being politicized. Among the new technologies added to this transport system is segmental bridge construction where simple span railway bridges are placed over two successive piers. As such long distances of railway bridges are being constructed by assembling simple span pre-fabricated segmental girders placed on the piers. One of the ways to prefabricate girders before on site erection on the piers is to pre-stress the structural member and modify its material properties (i.e. a reduced weight of concrete, reaching the full strength of the concrete and steel). In this research, an attempt is made to economically compare analysis and design of two units of single cell pre-stressed box girders and one unit of double cell pre-stressed box girder railway bridges and to select an economical one on the basis of construction material cost. For both cases, cost versus span is made so as to meet the economic comparison objectives of the study. Bases on the study, it is obtained that applying two units of single cell pre-stressed box girder railway bridges is uneconomical way of arrangement than one unit of double cell pre-stressed box girder railway bridge for simple spans greater than 34m.