Department Details
Branch: Engineerings
Department: Civil Engineering Department
Location: Adminstrative Building

Publication Details
Staff Member Name1- Prof. dr. Ahmed Mahmoud Azmy
Publication Name An experimental Study on Strengthening of High-Strength Reinforced Concrete Columns Using Contacted and Non-Contacted Steel Jacket
Publication DescriptionIn the recent three decades the use of composite structures has become widespread. High-strength concrete is one of the modern materials used to minimize the concrete dimensions of the reinforced concrete sections. The extensive uses of high strength concrete structures are restricted by the depleted ductility problem of high strength concrete. The high-strength reinforced concrete columns may be subjected to excessive loading due to un-designed earthquake or wind loads or changing of the building function. For these reasons, the need for strengthening of reinforced concrete column is an essential requirement. The traditional strengthening methods as using reinforced concrete jackets has effects on the architectural spaces, take a lot of construction time and has highly affect on the position of the center of rigidity of the building. In this paper, an experimental program is conducted to study the strengthening of high strength concrete columns using steel plate jacket. The high-strength reinforced concrete column is designed to satisfy the requirements of the Egyptian code. Two types of structural and thus, construction arrangement are used through the experimental program. The first type is introducing steel jacket with using steel dowels. These steel dowels make contact surface between the steel jacket and the high-strength reinforced concrete column. The other type is non-contacted by using steel plate jacket without any connection with the old reinforced concrete column. The composite action between the high-strength reinforced concrete column and the steel box jacket found to have a pronounced enhancement in the loading carrying capacity and ductility demands than the separated materials. The vertical and horizontal displacements are measured through the experimental work to account for the composite and confinement ductility and stiffness, respectively. Parametric studies are performed in this paper. The parametric studies include the effect of changing of steel plate jacket thickness and the effect of short column length on the load carrying capacity and ductility of strengthening high-strength reinforced concrete columns.
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