الفهرس 
CHAPTER 1 - INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Reinforced concrete jacketing has been used widely for strengthening RC columns. In some cases, such as corner and edge columns, it is impossible to strengthen a column using a full jacket. Many studies have focused on fully strengthened reinforced concrete columns. However additional study is required for partially strengthened RC columns from two and three sides. So, this research focused on studying the effectiveness of strengthening the corner and edge columns under vertical load and under the combination of vertical and lateral loads. Also, the research illustrated the behavior of RC columns strengthened by RC jackets from two, three, and four sides of the perimeter and it investigated the effect of using the different interaction methods between original columns and strengthening jackets such as friction, dowels, and stirrups’ welding.
Therefore, an analytical study and experimental program were performed. The experimental study consisted of group of specimens having 1000 mm height, 100x100 mm cross section, and main reinforcement 4Ø10 mm with stirrups 9Ø4 mm. The specimens were divided into fifteen study cases. Different parameters such as strengthening sides, surface connections, jacket to column stirrups connection type, and loads directions due to the column location. The results were compared with some of the design equations in various codes and the results from finite element analysis.
A new design equation was developed from this study to calculate the capacity of a partially strengthened column under vertical load. An analytical approach was introduced to predict partial strengthened R.C. column capacity for axial and eccentric loading. By the aid of this analytical approach, flow charts were created to get the capacity of corner and edge columns subjected to vertical and lateral loads. Recommendations for column behavior after strengthening were presented to help structural engineers to capture the best efficiency from the full and partial strengthening.