Experimental programmes have to be carried out to study the behaviour of flexural and shear rc beams with precast sifcon laminates. Cfrp laminates in order to double their load carrying capacity. An increase in the postcracking flexural stiffness of 75 to 175% was obtained for the retrofitted beams. Automotive roof panels composed of cfrp require high strength and bending stiffness to ensure driver safety during rollover.
Frp materials are supplied as bars for reinforced and prestressing applications and in flat sheets or laminates for use as repair materials for concrete structures. School of mechanical and building sciences, vit university, vellore, tamil nadu, india email. Frp composite laminates, nonlinear continuum damage modelling, failure envelopes, fea. Delamination in frp composite laminates 209 using ansys ver 5. Our fiberglass reinforced plastic frp is a strong composite material that repels dirt and stains making it an ideal surface for highuse commercial settings and service areas that depend on sanitary conditions. Though the research and application of retrofittingstrengthening of concrete structures using externally bonded frp composites has started. Generally, the mechanical properties of cfrp products depend on the layup method.
Idi fabrication frp sheet laminates are available in grades gpo1, gpo2, and gpo3, and select grades can also be used in aieeclass b through h electrical applications. Us3939024a structural reinforced thermoplastic laminates. Camanho abstract a new set of six failure criteria for fiber reinforced polymer laminates is described. Using bonded frp laminates in this project provided an opportunity for nysdot to demonstrate their use and investigate their feasibility as a costeffective bridge rehabilitation technique. Fire behavior of reinforced concrete beams flexurally strengthened with cfrp laminates 2 performance of frpstrengthened concrete beams subjected to fire exposure. There are numerous studies available, that suggests different strengthening schemes using frp laminates. Pdf strengthening of reinforced concrete beams using. Flexural behaviour of rc and pc beams strengthened with. Flexural strengthening of concrete structures with prestressed frp. Idi provides a full range of molded thicknesses, from 2 inch to 1 inch, in 36x72 inch and 48x72 inch sheets. These nonuniform loads caused combined effects of flexure and torsion. The ratio of modes in different angle ply laminates and the associated criteria for matrix crack initiation are explored. Matrix crack and fibre breakage are the main damage models of the fibre reinforced polymer frp laminates under cyclic loading. Steel bars were modelled as an elastic perfect ly plastic materia l, with perfect bond between concrete and steel.
When compared to eglass, laminates made with sglass show improvements in strength, stiffness, impact resistance, toughness, and service temperature. Strengthening using fibre reinforced polymer frp plastic and polymer materials that are reinforced with structural fiber. Although the fibres and resins used in simon systems are relatively expensive compared to steel and concrete, the labor and equipment cost to install retrofitting of rc beam using simcon laminate v. In md frp composite laminates, matrix yieldingcracking and interface delamination are observed as the early damage mechanisms due to. The steel fibres used in the study were hooked end fibres having 0. Rehabilitation of steel bridge members with frp composite. The cfrp strips are manufactured using a pultrusion process. Numerical analysis of reinforced concrete beam strengthened. Concrete was modelled using a plastic damage model.
Rc beams as a structural member contain a variety of nonuniform loads. Wherever theres a lot of action and high traffic, thats where you need frp wall and ceiling panel systems. The effect of matrix cracking on the residual stiffness of various laminates is determined both experimentally and using finite element simulation. Retrofitting of rcc beams using frp and ferrocement. The deflections are lower when bonded externally with frp sheets. The development of these failure modes is shown schematically in figure 1 reifsnider 1983. Frp is a composite material made of a polymer matrix reinforced with fibers. This paper describes a test programme that examines the hygrothermal compliance of five commercial woodlaminating adhesives when bonding commercially viable frp materials to wood. Wrapping the gfrp sheet or laminate tightly over a concrete cylinder in a two layers and apply the epoxy coat.
Sep 22, 2009 super laminates figure 1 offer three major advantages over conventional laminates. Pdf strengthening schemes for flexure and torsion using. When it comes to walls and ceilings, frp means business. Fiber reinforced polymer frp laminates are being successfully used for strengthe ning of existing reinforced concrete structures. First, by using unidirectional or biaxial fabrics, the laminate may provide strength in both longitudinal and transverse directions. Sarathkumar3 1,2,3student 1,2,3department of structural engineering 1,2,3paavai engineering college namakkal637018 india abstractnow a days natural and manmade disaster like earthquake, cyclone etc. Three dimensional, 8 noded, layered elements solid46 embodied in ansys have been used to model the laminate ply by ply and orthotropic properties have been input for each ply.
This paper presents the results of an experimental study to investigate the behaviour of structurally damaged fullscale reinforced concrete beams retrofitted with cfrp laminates in shear or in flexure. Aramid fiber reinforcement materials market analysis and industry forecast, 20142022 aramid fibers are synthetic fibers with exceptional heatresistance and strength. Retrofitting of reinforced concrete beams using composite. Flexural strengthening of rc continuous beams using cfrp.
Frp fiberglass reinforced plastic panolam surface systems. The use of frp sheet had effect in delaying the growth of crack formation. The concrete mixes for rc beams have to be designed to obtain a concrete grade of m20. Strengthening of reinforced concrete beams using cfrp laminates. It is noted that the behavior of the beams when bonded with frp sheets are better than the control beams. Using bonded fiber reinforced polymer frp laminates for strengthening and repair of structural members has been proven to be an effective and economic method. In this paper, mesomechanical analysis is used and a twoparameter model is developed to describe the stiffness reduction. Using precision control of the fiberglassptfe ratio, cuclad laminates offer a range of choi ces from the lowest dielectric constant and loss tangent to a more highly reinforced laminate with better dimensional stability. Derived from dvoraks fracture mechanics analyses of cracked plies and from pucks action plane concept, the physicallybased criteria. Nanni, bond of frp laminates to concrete, aci materials journal, vol.
Evaluation of thermal properties of eglass epoxy composites. Bondlaminates gmbh am patbergschen dorn 11 d59929 brilon germany phone. Failure criteria for frp laminates in plane stress carlos g. Structural reinforced thermoplastic laminates capable of supporting loads in at least two directions and containing by volume about 45% to 65% fiber reinforcement. Frp will not rot, stain or corrode, dent or splinter and will not support mold or mildew. Pdf bond of frp laminates to concrete researchgate. This paper presents a new method and a device for applying prestressed carbon fiber reinforced. Pcb material selection for rf, microwave and millimeter.
Retrofitting using frp laminates linkedin slideshare. A first setof tests was performed to investigate the effect of surface preparation, type of adhesive and concrete. This paper compares the values of the thermal and fire resistance properties of composites made using the hand layup technique. Frp laminates frp plate is a high strength, pre 11 3. The pultrusion principle is comparable with a continuous press. Carbonfiberreinforced plastic cfrp, which is strong and lightweight, is used in fabricating composites for a number of applications such as aircraft, transportation, and machinery. The behaviour of reinforced concrete beam strengthened with carbon fiber reinforced polymer cfrp and glass fiber reinforced polymer gfrp laminates was investigated using finite element models and the results are presented in this paper. Retrofitting of reinforced concrete beams using composite laminates article pdf available in construction and building materials 252. Application of frp laminates for strengthening of a. This paper presents test results at failure of 16 reinforced concrete rc continuous beams with different arrangements of internal steel bars and external carbon fibre reinforced polymer cfrp laminates. Carbon fiber reinforced polymer cfrp laminates for. In recent years, carbon and glass frp sheets have been applied using the retrofitting. Composite laminates there are four primary failure modes in frp fiber reinforced f. Fibre reinforced polymer frpstrengthened glulam would be a more economically viable product if a single adhesive type could be utilised at all the bonded interfaces.
Generally, the mechanical properties of cfrp products depend on the layup. Bonding techniques for flexural strengthening of r. Retrofitting using frp laminates 20142018 a dissertation submitted to. This is a tremendous advantage that opens the door to many new applications. Failure modes in filled hole gfrp laminates for connections. Bond of the frp reinforcement to the concrete substrate is of. Earlier research has demonstrated that the addition of carbon fibre reinforced polymer cfrp laminate to reinforced concrete beams can increase stiffness and maximum load of the beams.
Retrofitting of rcc beams using frp and ferrocement laminates awadhesh 2kumar1, nitin modi associate professor1, pg 2student department of civil engineering, delhi technological university, delhi, india abstract. Ppt history frp fiber reinforced materials powerpoint. Eglass fiber reinforced epoxy composites was fabricated by filling varying concentration of aluminum oxide al 2 o 3, magnesium hydroxidemgoh 2, silicon carbide sic, and hematite powder. Super laminates figure 1 offer three major advantages over conventional laminates. Now apply the epoxy mixture on concrete cylinder with the help of brush to paste the glass fiber reinforced polymer gfrp. Pcb laminates considered here consist of one or more plies of resinimpregnated glass.
Failure modes in filled hole gfrp laminates for connections between frp and concrete r. Repair of bridges using fiber reinforcement polymers frp. The laminates can be used with or without metal cladding. The connector itself usually presents high shear resistance. Flexural strengthening of reinforced concrete beams using externally bonded frp laminates prestressed with a new method.
Frp super laminates present unparalleled solutions to old. Normally 24,000 parallel filaments are pulled through the impregnated bath, formed into strips under heat, and hardened. Concrete beams reinforced with cfrp laminates upcommons. Sglass is used for highperformance surf and sailboards. Flexural strengthening of rc continuous beams using cfrp laminates. Pcb material selection for rf, microwave and millimeter wave. These modes are matrix cracking, fibermatrix debonding, fiber breaking, and delamination. Fire behavior of reinforced concrete beams flexurally strengthened with cfrp laminates 2 performance of frp strengthened concrete beams subjected to fire exposure.
It contains the twophase fiber and matrix loss factors and the interfacial loss factor of the composite materials, in which the twophase loss factors are termed as system loss factor. Flexural strengthening of reinforced concrete beams using. High strength and stiffness, light weight and good fatigue and durability properties of frp composites together with advantages offered by adhesive bonding have made it a. Cuclad laminates are woven fiberglassptfe composite materials for use as printed circuit board substrates. Retrofitting using frp laminates make a mixture of epoxy resin and hardener in the ratio of 100. Bond quality at the frpwood interface using woodlaminating. A new method has been developed at chalmers university of technology where the prestressing force is applied in segments. The main variables considered were the internal reinforcement ratio, position of retrofitting and the length of cfrp. Apr 16, 2016 carbonfiberreinforced plastic cfrp, which is strong and lightweight, is used in fabricating composites for a number of applications such as aircraft, transportation, and machinery. Introduction in the early 20th century friedrich otto hetzer proposed glued laminated glulam timber elements by a strategic application of slender sawn timber pieces. Design of roof panel with required bending stiffness using. Ptfewoven fiberglass laminates microwave printed circuit.
This study clearly demonstrated the effectiveness of the proposed technique in retrofitting reinforced concrete buildings in egypt. Externally bonded fiber reinforced polymer frp laminates emerged in the late 80s presenting some remarkable qualities that can solve the deficiencies of. Fire behavior of reinforced concrete beams flexurally. Retrofitting of rcc beams using frp and ferrocement laminates. Frp can be fabricatedapplied with adhesives that have low or 0 voc content and are compliant with the rule.