Bøger af Neeru Bansal

Reinforced concrete structures may be required to be upgraded for various reasons. Structural inadequacy of materials like concrete and steel. The application of CFRP as external reinforcement to strengthen concrete beams has received much attention from researchers, but only very few studies have focused on structural members strengthened after preloading. The behavior of structures which have been preloaded until cracking initiates deserves more attention, since this corresponds to the real-life use of CFRP retrofitting. The process of upgrading the strength, regaining the lost strength and enhancing the performance of the structure locally or globally is referred to as retrofitting. Strength, stiffness and ductility of few elements or whole building can be altered by retrofitting. Ferrocement jacketing for retrofitting can be useful as it is economical, easy to apply from the view point of less skill labour requirement, lightweight and high tensile strength. In this study for shear lacking RC beams deflections of specimens are noted after stressing the specimens to ultimate load. Then retrofitting is done with ferrocement and their strength is compared to control specimens.

In most of the civil structures, continuity between two adjacent members is necessary; this can be even though the members¿ angle. The joint formed from this assembling usually refers to the "corner". The term ''corner'' in this investigation is used to describe a corner joint formed by the joining; at 900 of the ends of two flexural members (Mayfield et. al, 1972) respectively. Concrete corners are found in wide variety of structures such as retaining walls, bridges and portal frame buildings. They are also common in the field of hydraulic structures, such as reservoirs, tanks, flumes and culverts. Various detailing systems have been in vogue from time to time and considerable efforts have been carried out to improve these detailing systems to achieve the optimum structural behavior. In general, the failure of opening corners is invariably characterized by the low tensile strength of concrete, resulting in the initiation of a splitting tensile crack originating at the re-entrant corner and gradually moving out along the corner diagonal towards the exterior corner.