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IJSTR >> Volume 10 - Issue 5, May 2021 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Behavior Of Edge And Corner Columns Strengthened By Concrete Jackets In Multi-Story

[Full Text]



Mahmoud Eid Nasr, M. Nour El Din, Hisham Ahmed El-Arabaty, M. Al Azzouny



Repair, Strengthening, non-symmetric jacket, ANSYS, multi-story jacket.



When a structural element deteriorates, it becomes liable to the current load and the additional loads that it must be subjected to in the future. Since the columns are the most important structural element, the strengthening of columns, relative to other members is of prime importance. Reinforced concrete jackets are one of the most common techniques used to strengthening columns. In this method, the axial strength, bending strength, and column stiffness are increased. Transferring the load from the original column to the concrete jacket depends on the friction between the column and the jacket. The larger surface area between the column and the jacket, the greater the friction value, thus increasing the axial capacity of the strengthened column. In the case of non-symmetric concrete jacket, such as the Edge and corner columns (three sides jacket and two sides jacket), the surface area between the column and jacket decreases, and thus the friction decreases, and the jacket efficiency decreases. The aim of this research is to study the effect of increasing the number of floors strengthened with non-symmetric concrete jacket on the efficiency of the column after strengthened. The calculations based on the Indian Standard Code IS 15988 (2013) to determine the behavior of concrete jacket. Several columns were modeled using ANSYS software. The analysis results indicate that the use of two-story concrete jacket increases the axial capacity of the column more than the use of one floor concrete jacket. Also, from the comparison of the results, it found that the mathematical design using the equations in the Indian code does not consider the number of strengthen story or the friction between the concrete jacket and the original column.



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