International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
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Strengthening Of RC Beam Using Polypropylene Fiber Sheet And Rubberized Coir Fiber Sheet Shruti.S.Biradar1.a, Dr.Sunil Kumar Tengli2.b 1Student
of M.Tech Computer Aided Structural Engineering, Department of civil engineering, REVA University, Bengaluru, India 2P.G. Coordinator, School Of Civil Engineering, REVA University, Bengaluru, India ---------------------------------------------------------------------****------------------------------------------------------------------
Abstract: Retrofitting is the method of strengthening of existing structures to make structural elements more resistant to seismic activity and deterioration of members due to ageing etc. Many of the existing reinforced concrete structures throughout the world are in immediate need of rehabilitation, repair or reconstruction due to various factors like corrosion, failure of bonding between beam-column joints etc. Several techniques are available to strengthening of the structural components, wrapping is one such technique that is successively employed to repair flexural members. The objective of the present study is to determine the effect of wrapping on beams using geo-textiles and to compare the results of control beam with analytical model done by using FEM software ANSYS 16. A total 12 beams, with (150mm ×260mm) rectangular cross section and of span 1200 mm were casted and tested. Beams are wrapped in two ways:- 1) at the bottom and 2) in U-shape up to neutral axis and flexural strength of beams are compared. In the experimental method, two control beams, one beams are retrofitted by using Polypropylene Fibre sheet of 2mm at the bottom full length of the beam, two beams are retrofitted by using Polypropylene Fibre sheet of 4mm at the bottom full length of the beam, two beams are retrofitted by using Polypropylene Fibre sheet of 4mm at the bottom full length of the beam upto neutral axis, one beams are retrofitted by using Rubberized coir fiber sheet of 2mm at the bottom full length of the beam, two beams are retrofitted by using Rubberized coir fiber sheet of 4mm at the bottom full length of the beam, two beams are retrofitted by using Rubberized coir fiber sheet of 4mm at the bottom full length of the beam up to neutral axis.. The beam specimens will be tested under two point loading and the load-deflection behavior is studied up to failure. Also the maximum load, the stress strain behavior and the complete crack patterns are studied. The flexural strength of retrofitted PF sheet beam is compared with the retrofitted RCFS beam and suitable retrofitting method is suggested. Key words: Reinforced Concrete Beam, Retrofit, Polypropylene fiber sheet, Rubberized coir sheet, Ansys
1. Introduction In the earlier period it is thought that concrete will be a Structure of free maintenance. Later on, this myth has proved wrong. Due to the majority of Civil Engineering structures being RCC, its requirement of maintenance and strengthening work has also increased tremendously. Many existing structures, which do not fulfill the specified requirements as per expectation. These failures are due to sudden loading like impact, earthquake, rebar corrosion and fatigue etc. A structural members in general subjected to torsion, shear axial thrust or tension and flexure. Concrete is a rigid material which has high compressive strength and it is weak in tensile strength. To improve the tensile strength reinforcing bars are used. In addition to that fiber sheets are used to improve the tensile response, particularly the ductility. The most commonly used FRP types are CFRP, GFRP. The present experimental research work is based on retrofitting method for strengthening of RC beams using polypropylene fibre sheet and rubberized coir fibre sheet. And the results of conventional RC beams are compared with analytical results.
2. Literature Survey i.
Anumol Raj et al (2013), experimentally studied R.C.C. beams strengthened with various types of fibres externally. They casted total 30 beams with cross section of 150 mm × 150 mm × 1000 mm. They applied different types of fiber sheets i.e. Carbon, Glass, Steel, Polypropylene and Coir. The full wrapping technique around all the sides of the beams is used as the method of strengthening. They concluded that the ultimate strength increment in carbon, glass, steel and coir fiber sheet strengthened beam by 125%, 89.6%, 45.02% and 37.9% respectively. But considering cost effectiveness and strength increment, they recommended Glass FRP sheets for use.
ii.
Subramani.T et. al (2015), An analytical and experimental study has been carried out to investigate the behavior of concrete beams bonded with strengthened Glass Fiber- Reinforced Polymer (GFRP) sheets on all sides with
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