Experimental Research of Continuous Concrete Beams with GFRP Reinforcement

Abstract

Continuous beams are often used within RC structures, which are exposed to aggressive environmental impact. The use of the fiber-reinforced polymer (FRP) reinforcement in these objects and environments has a big significance, taking into account tendency of steel reinforcement to corrode. The main aim of these research studies is to estimate ability of continuous beams with glass FRP (GFRP) reinforcement to redistribute internal forces, as a certain way of ductility and desirable behaviour of RC structures. This paper gives the results of experimental research of seven continuous beams, over two spans of 1850 mm length, cross-section of 150 × 250 mm, that are imposed to concentrated forces in the middle of spans until failure. Six beams were reinforced with different longitudinal GFRP and same transverse GFRP reinforcements, and one steel-reinforced beam was adopted as a control beam. The main varied parameters represent the type of GFRP reinforcement and ratio of longitudinal reinforcement at the midspan and at the middle support, i.e., design moment redistribution. The results of the research have shown that moment redistribution in continuous beams of GFRP reinforcement is possible, without decreasing the load-carrying capacity, compared to elastic analysis. The test results have also been compared to current code provisions, and they have shown that the American Concrete Institute (ACI) 440.1R-15 well predicted the failure load for continuous beams with GFRP reinforcement. On the contrary, current design codes underestimate deflection of continuous beams with GFRP reinforcement, especially for higher load levels. Consequently, a modified model for calculation of deflection is proposed.

Neural Networks—Deflection Prediction of Continuous Beams with GFRP Reinforcement

“…The highest value is the gross concrete cross-section. The effective moment of inertia decreases with increasing load and is calculated by formula (3) [3]:…”

“…This is a proposed formula for the effective moment of inertia based on experimental results for six beams [3]. M cr is a moment at the appearance of the first crack (cracking moment).…”

“…This paper presents its application. The database was formed from available data from, in this case, experimental research on continuous beams reinforced with GFRP reinforcement [3,4].…”

Experimental Study on the Shear Strength of Dune Sand Concrete Beams

“…Beam is one of the important components of the structure, so numerous studies have been carried out in previously literatures [29][30][31][32][33][34][35]. However, comparably rare research on the shear behaviour of DSC beams has been carried out.…”

Behavior Evaluation of Ultrahigh‐Performance Concrete Beam Containing Para‐Aramid Fibers

“…Concrete, which is known as a brittle material, overcomes its brittle property through fiber mixing [3][4][5][6][7][8][9][10]. e most superior fiber among the various fibers used in research is steel fiber.…”