Retrofitting of Deficient RC Frame Structure
Keywords:
Jacketing, Concrete Jacketing, Steel Jacketing, FRP Jacketing, RC FrameAbstract
RCC-framed structures are the most common and widely accepted form of construction around the globe. The structures have been created with huge investment, and it would not be feasible to build them again out of limited national resources. Therefore, it is very much needed to be maintained and repaired whenever needed. Deterioration of RCC is quite natural, which is clearly visible in many structures. But unfortunately, due to multiple reasons like improper design, faulty construction, change of usage of the building, and change in codal provisions, these structures are often found to exhibit distress even before their service life is over. Since replacement of such deficient elements of structures incurs a huge amount of public money and time, retrofitting has become the acceptable way of improving their load-carrying capacity and extending their service lives. In the present research work, the effect of local retrofitting methods on deficient RCC members of the building has been studied using finite element analysis. The study was done by initially designing a G + 3 RCC frame structure using STAAD Pro. The three types of construction deficiencies are induced in the original columns and beams, which consist of reducing the area of steel and reducing the grade of concrete and steel. Then the retrofitted models are prepared using RC jacketing, steel jacketing, CFRP jacketing, and GFRP jacketing using ANSYS. Then, each type of column and beam are numerically simulated to determine the total deformation and equivalent stress in the members. The cost of each retrofit employed is also calculated and compared. The outcomes of this investigation show that the proposed RC jacketing significantly improves the total deformation of the columns and beams and proves to be cost-effective as compared to the other jacketing methods.
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