الفهرس 
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Abstract
There are many existing structures, which do not fulfill specified requirements. This is due to upgrading of the design standards, increased loading, corrosion of the reinforcement bars, construction errors or accidents such as earthquakes. To remedy for insufficient capacity the structures need to be replaced or strengthened. The innovative rehabilitation and strengthening methods for reinforced concrete structures, such as steel x-bracing, masonry infill wall, CFRP sheets, and RC jacketing have taken a large portion of the research work in the field of repair and restoration of buildings. Previous studies were conducted in the strengthening of RC frames using each technique separately with experimental study to demonstrate the efficiency of these techniques and seismic behavior of the RC frames. his paper presents a theoretical finite element study on effect of different strengthening techniques on structural behavior of the reinforced concrete frames subjected to earthquake motion. In the study, diagonal cross bracing, masonry infill wall, externally CFRP sheets, and reinforced concrete jacketing for columns are considered as different strengthening techniques of one story reinforced concrete bare frame. Time history analysis for the frame subjected to EL-Centro (1940 N-S) earthquake ground motion is carried out using ETABS software. The obtained results from the time history analysis including axial and shear stresses, lateral displacement, acceleration and base shear with time are illustrated and discussed with/ or without the strengthening techniques. The study illustrates the influence and enhancement of each technique on the performance of one-story bare frame subjected to EL-Centro earthquake motion.There are many existing structures, which do not fulfill specified requirements. This is due to upgrading of the design standards, increased loading, corrosion of the reinforcement bars, construction errors or accidents such as earthquakes. To remedy for insufficient capacity the structures need to be replaced or strengthened. The innovative rehabilitation and strengthening methods for reinforced concrete structures, such as steel x-bracing, masonry infill wall, CFRP sheets, and RC jacketing have taken a large portion of the research work in the field of repair and restoration of buildings. Previous studies were conducted in the strengthening of RC frames using each technique separately with experimental study to demonstrate the efficiency of these techniques and seismic behavior of the RC frames.
This paper presents a theoretical finite element study on effect of different strengthening techniques on structural behavior of the reinforced concrete frames subjected to earthquake motion. In the study, diagonal cross bracing, masonry infill wall, externally CFRP sheets, and reinforced concrete jacketing for columns are considered as different strengthening techniques of one story reinforced concrete bare frame. Time history analysis for the frame subjected to EL-Centro (1940 N-S) earthquake ground motion is carried out using ETABS software. The obtained results from the time history analysis including axial and shear stresses, lateral displacement, acceleration and base shear with time are illustrated and discussed with/ or without the strengthening techniques. The study illustrates the influence and enhancement of each technique on the performance of one-story bare frame subjected to EL-Centro earthquake motion.