The effect of transverse steel rebars on the behavior of concrete beam reinforced with glass polymer rebars

In the present study, the flexural behavior of concrete beams reinforced with longitudinal rebars made of glass fiber reinforced polymer composites (GFRP), is studied using finite element method.
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The effect of transverse steel rebars on the behavior of concrete beam reinforced with glass polymer rebars Engineering Solid Mechanics (2017) 205-212 Contents lists available at GrowingScience Engineering Solid Mechanics homepage: www.GrowingScience.com/esmThe effect of transverse steel rebars on the behavior of concrete beam reinforcedwith glass polymer rebarsMojtaba Hosseinia*, Shahpoor Mehdipourb and Peyman Beiranvandca Associate Professor, Department of Civil Engineering, Lorestan University, Khorramabad, Iranb M.Sc, Department of Civil Engineering, Islamic Azad University Arak, Iranc PhD Candidate, Department of Civil Engineering, Razi University, Kermanshah, IranA R T I C L EI N F O ABSTRACT Article history: In the present study, the flexural behavior of concrete beams reinforced with longitudinal rebars Received 6 November, 2016 made of glass fiber reinforced polymer composites (GFRP), is studied using finite element Accepted 14 July 2017 method. For this purpose, a number of concrete beams with square sections are modeled in Available online ABAQUS. In all of the beams, four GFRP rebars with diameter of 12 mm, and 10 steel rebars 14 July 2017 Keywords: with diameter of 8 mm are vertically used to prevent creating shear cracks in the beams. The Glass fiber reinforced polymer beam no. 1 is without transverse rebar, beam no. 2 has a row of transverse rebar, which is Finite element placed at the bottom and in the plane of vertical rebars. Beam no. 3 has a row of transverse Transverse rebars rebars that is placed at the top and in the plane of vertical rebars; and the beam no. 4 has two rows of transverse rebar at the top and bottom of the beam in the plane of vertical rebars. The beams are gradually loaded under up to 6 ton, and the amounts of displacement and strain at the middle of beams are compared together. The obtained results reveal that the force- displacement diagram of reinforced beams with composite rebars are almost linear until ultimate phase, and in all of the beams, adding transverse rebar leads to less deflection in the middle of the beam under an identical loading. Moreover, the load bearing capacity of beams containing transverse rebars, were higher than the other beams. © 2017 Growing Science Ltd. All rights reserved.1. Introduction Experimental studies show that steel fibers can be used as stirrups in beams, frames, and decks andalso can be used as strengthening shear reinforcement in precast beams with thin web. The reinforcingfibers can be added to concrete mixture in the critical regions of members created with pre-stressedconcrete or in-cast concrete, in order to remove secondary reinforcements. Fiber-reinforced concretescan be used to improve ductility and the seismic strength of structures. High strength non-metallicfibers such as carbon, glass, and aramid, surrounded in a polymeric matrix, show a proper potential forconcrete reinforcement. Polymeric resistant fibers are existing with different types such as rebar, mesh,* Corresponding author.E-mail addresses: Hosseini.m@lu.ac.ir (M. Hosseini)© 2017 Growing Science Ltd. All rights reserved.doi: 10.5267/j.esm.2017.7.001206cable, ropes, tendons, laminate and a variety of structural profiles, which are usually known as FRP. Inspite of the recent advances in this field, numerous researches are reported in many papers fromdifferent views of its structural application. FRPs have been used for structural reinforcing of structures.Hosseini et al. (2016) studied numerically some reinforced concrete beams containing bending andshear opening and strengthened with FRP sheet. They showed wrapping of the opening region withFRP sheets from the exterior zone was more effective than wrapping it from the inside of opening.Ramana et al. (2000) performed a study on the behavior of CFRP strengthened reinforced concretebeams with varying degrees of strengthening. They investigated the experimental results and analyticalstudies of flexural strengthening of RC beams by means of external attaching of high strength and lightlaminates of CFRP at the tensile region of the beam. In their study, the maximum increase in the firstcrack ultimate moments and stiffness of reinforced beams were found about 150 to 230 and 110%,respectively. Islam et al. (2005) studied the shear strengthening of RC deep beams using external FRPreliable methods, in which 6 deep concrete beam were prepared for testing. The tests have shown thatthe use of FRP reliable method leads to decrease the propagation of critical diagonal cracks, and alsoleads to increase the load bearing capacity of the beam. Obaidat et al. (2011) studied the retrofitting ofreinforced concrete beams using composite laminates. They reported the results of an experimentalstudy regarding the structural behav ...