Deflection (engineering)

About: Deflection (engineering) is a research topic. Over the lifetime, 30862 publications have been published within this topic receiving 298849 citations.

Strength and Ductility of Reinforced Concrete Beams Externally Reinforced with Carbon Fiber Fabric

Abstract: This paper presents results obtained from an experimental study of reinforced concrete beams strengthened in flexure and shear using externally epoxy-bonded bidirectional carbon fiber fabric. Two series of 3 large-scale concrete beam models were built and tested under 4-point bending. The beams of the 2 series were internally reinforced with high-tensile steel for both shear and flexure. One beam for each series was used as a control beam without external reinforcement. The difference between the 2 series related to the amount of internal stirrups and concrete strength. To study effects of external composite reinforcement, variations in the number of layers applied and in the external end arrangements were made. One type of external reinforcement consisted of 2 layers of fabric bonded to the tension face of the beam and partly extended up to the vertical sides. The second arrangement consisted of 4 layers of fabric and supplementary end anchorages. The composite reinforcement led to an increase both in the load-carrying capacity at ultimate and flexural stiffness as compared with control beams. Significant reductions in deflection, curvature, and structural ductility were observed.

Structural performance of corrosion-damaged concrete beams

Abstract: This paper describes experimental work to investigate the effect of reinforcement corrosion on the behaviour of concrete beams reinforced with plain round bars. Particular attention is paid to the bond between reinforcement and concrete. Four groups of beam specimens were tested, each designed to investigate specific aspects of structural performance including stiffness and deflection under service loads, ultimate flexural and shear strengths and deformation capacity at failure. Beams were conditioned to induce loss of cross-sectional reinforcement of up to 10% owing to corrosion, equivalent to 0·3 mm corrosion penetration, and longitudinal crack widths of 1·0 mm. Flexural stiffness of specimens detailed for a flexural mode of failure was not impaired by corrosion. Strength of beams with corroded bars equalled or exceeded that of companion non-corroded specimens in all cases, despite loss of bar section. It is concluded that an enhancement of anchorage capacity, believed to be associated principally with ...