Measurement of bending in construction beams- FRP reinforced concrete beams

The FRP reinforcing bar, which is a structural reinforcing bar made form filaments or fibers held in a polymeric resin matrix binder. The FRP bar can be made from various types of fibers such as glass (GFRP) or carbon (CFRP). FRP bars have a surface treatment that facilitates a bond between the finished bar and the structural element into which they are placed. FRP Bars are intended for use as concrete reinforcing in areas where steel reinforcing has a limited life span due to the effects of corrosion. They are also used in situations where electrical or magnetic transparency is needed. In addition to reinforcing for new concrete construction, FRP bars are used to structurally strengthen existing masonry, concrete or wood members [1]. FRP bars are a new type of structural material for the civil engineering community. The basic constituent materials for reinforced concrete design have changed very little in the past 100 years. Traditionally, composite materials have been used extensively in aerospace and consumer sporting goods where their high strength to weight characteristics were first exploited. Corrosion of steel reinforcement in concrete structures causes deterioration of concrete resulting in costly maintenance, repairs and shortening of the service life of structures. Government agencies throughout the world have recognized the potential benefits to society if our infrastructure can last longer and are thus funding significant amounts of research in the field of FRP's [2] [3]. In this paper, the bending resistance of FRP reinforced concrete beams is measured by the bending moment effect using tools such as Cathode-ray oscilloscope (CRO) and using a parallel plate capacitor to detect small displacements of the beam under pressure. CRO cathode ray oscilloscopes are used to measure small deformations of beams at different pressures. And parallel plate capacitors can detect changes in capacitance by different metal electrode spacing. The frequency is measured by the oscilloscope's Lissajous curve and compared to its theoretical frequency. In addition, according to the stress test results of the beam, the finite element analysis was performed using the constitutive material model of ordinary concrete to simulate the bending behavior of these beams. The simulation results are then used to determine the accuracy of the constitutive model used to predict the performance of FRP reinforced concrete beams.