Structural Engineering

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Browsing Structural Engineering by Author "Abel, Tsegaye"

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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.