Browsing by Author "Abel, Tsegaye"

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    Assessment of Facility Management Practices of Selected Public and Private Buildings in Addis Ababa
    (Addis Ababa University, 2022-01) Abel, Tsegaye; Abraham, Assefa (PhD)
    Facility Management studies and finds out a way to use a facility up to that pre-destined purpose by enhancing the efficiency and effectiveness without putting the facility in jeopardy. Facility Management has found popularity in different countries; since, its benefits are acknowledged by end users and owners of buildings. However existing buildings have a lot of shortage in providing appropriate services due to lack of proper facility management. This study has focused on facility management practice of public and private buildings and the services being given by facility management providing firms in Addis Ababa. Data for the study is collected in a case study approach from three distinct case studies and by interviewees and questionnaires to facility management firms, building owners and end uses of buildings. Based on the study, the current services being given by the existing facility management companies in Addis Ababa are of a property management type like security, maintenance, cleaning, and rental services. Furthermore, the research indicated that service being given by providers are in the early development stage; as the facility management practice is being operated by professionals with a very little facility management related background knowledge. In addition, it was found that most buildings don’t have either facility management firm by themselves as department or hire service providers. Accordingly, the practice of facility management is found on its infant stage but it is expected to boom due to its benefits during operational phase of a building. Accordingly, for the successful operation of a building in the city, development of facility management and improvement of existing facility management practices by end users and building owners are recommended. Furthermore, enhancement of technology aided practices by service providers and training of professional in the field of area are recommended.
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    Push out Test using Reinforcement Bars as a Shear Connector for Composite System
    (Addis Ababa University, 2021-09) Abel, Tsegaye; Girma, Zerayohannes (Prof.)
    In steel-concrete composite structures, the shear connectors are mostly used to transfer the longitudinal shear forces between the steel-concrete interfaces or to restrict longitudinal slipping and uplifting at the elements interface. This research paper assesses the feasibility of reinforcement bars as a shear connector in composite steel-concrete structures by using the push-out test. However, in the construction practice of our country due to various reasons, the application of composite structure, as well as shear connector, have not been dealt with in-depth. One of the main issues in our knowledge of composite structure is the material supply problem, this is also related to the development of the country even if they were made without shear connectors whether by lack of awareness or by negligence. Therefore, to reduce such things, this project investigates local materials that are easily available on site for composite structure. This paper investigates reinforcement bars by experimental study of shear connectors in composite structures. The experimental investigation is conducted using six push-out test specimens with a new type of shear connector with diameters of 14 and 20mm reinforcement bars with concrete grade of C-20/25, C-25/30 & C-30/37. The test specimens were designed to study the effect of the following parameters on the ultimate load capacity: the height, the diameter of the shear connector, thickness of the concrete slab, profiled sheeting and the compressive strength of concrete. The experimental results were presented and discussed by focusing on the failure modes and load-slip behaviour. Results are used to compare with those provided either by Standards, experimental work or found in the literature. The test phenomenon has shown that the shear capacity and ductility of shear connectors would significantly increase with the increment of diameter and compressive strength of concrete. It could be concluded that these steel-concrete composite beams connected by rebar connector show small deformation before failure, and so the failure modes were a brittle failure.