Geodesy and Geomatics

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Browsing Geodesy and Geomatics by Author "Adamu, Asnake(PhD)"

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    Connection Study of Long Span Steel Truss Bridges
    (Addis Ababa University, 2012-04) mebratie, Leule; Adamu, Asnake(PhD)
    Safe and economic design of a structure is an indication of good computational process which has been followed in this work. This intensive computation of analysis and design of structural elements had great value in the transfer of loads. During the structural analysis of truss elements and design of the elements; joints between the truss chords play great role in transferring the force. The very custom of designing a connection element is standard detail information and even without an adaptation of the connection design and this situation is hardly very risky, for especially to Ethiopian case; because we even do not have a manual or a guide line for such a long span steel truss bridge connections. This problem calls for the study of long span steel truss bridge connections. Failure stresses of Connections of steel structural elements are verified and have got recommendations to handle or to minimize it. Thus, this research is intended to assess the reliable connection design process for all designers and for concerned governmental body who are responsible in code book or standard preparation.
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    Study on Local Steel Profiles in Steel Concrete Composite Bridges
    (Addis Ababa University, 2009-08) Hailemariam, Dawit; Adamu, Asnake(PhD)
    Building a functional transportation infrastructure is a high priority for a nation, particularly for developing country like ours. Currently, the Ethiopian government has given special attention for road construction sector and is to invest billions of dollars. Parallel to road construction, there is also a demand of construction of bridges as most of the existing ones are getting older as they are constructed, during colonization by Italians. Construction of such bridges naturally occupy longer construction time where the time required may be farther exacerbated due to shortage of budget beside having bad construction management practice which is observed in many construction undertakings. Associated with this, the normal day to day traffic flow is affected and causes discomforts to the road users. This problem is serious especially in towns where there is high traffic volume and provision of detours is not simple. Thus, as alternate, steel-concrete composite bridge which obviously shortens the construction time and alleviates the problems with other added advantages is thought in this study. Therefore, in this thesis attempt is being made to compare the usage of locally produced steel profile in steel-concrete composite bridges with the conventional reinforced concrete deck girder bridges cost wise, beside evaluating other merits of such application. In the thesis work, relevant literatures are reviewed, assessment of availability of local steel profiles for such application has been made to local private and governmental companies that are engaged in manufacturing, supplying and installing of such steel profiles for different engineering purposes. Kality Metal Products Factory, Mesfin Industrial Engineering PLC and Maru Metal Industry are among some whose local products are considered. Accordingly, it is observed that there is local capacity and experience of manufacturing I-section profiles by