Browsing School of Technology by Author "Lees, Janet Marillyn"

Now showing items 1-19 of 19

  • Analysis of concrete beams with partially bonded composite reinforcement 

    Lees, Janet Marillyn; Burgoyne, Christopher John (American Concrete InstituteACI Structural Journal, 2000)
    Beams prestressed with partially bonded fiber-reinforced plastic (FRP) tendons have high strength and rotation capacity but cannot be modeled by conventional techniques. Herein, it is assumed that all deformation takes ...

  • Behaviour of GFRP adhesive pipe joints subjected to pressure and axial loadings 

    Lees, Janet Marillyn (ElsevierComposites Part A: Applied Science and Manufacturing, 2006)
    The corrosion resistance of glass-fibre reinforced polymers (GFRPs) is a key advantage in pipeline applications. Adhesive bonded joints are often used in tensile resistant GFRP pipe systems and the behaviour of small-diameter ...

  • CFRP prestressed concrete lighting columns 

    Terrasi, GP; Lees, Janet Marillyn (American Concrete InstituteField Applications of FRP Reinforcement: Case Studies, 2003)

  • Effects of solution exposure on the combined axial-shear behaviour of unidirectional CFRP rods 

    Lees, Janet Marillyn; Scott, P (ElsevierComposites Part A: Applied Science and Manufacturing, 2012-04-06)
    In fibre reinforced polymer (FRP) prestressed concrete applications, an FRP tendon must sustain high axial tensile stresses and, if cracks occur, additional dowel forces. The tendon may also be exposed to solutions and so ...

  • Efficient CFRP strap configurations for the shear strengthening of RC T-beams 

    Hoult, Neil Anthony; Lees, Janet Marillyn (American Society of Civil EngineersASCE Journal of Composites for Construction, 2009)
    A prestressed carbon fiber-reinforced polymer (CFRP) strap retrofitting system has been found to significantly enhance the shear capacity of existing reinforced concrete beams. In previous studies, the CFRP straps were ...

  • Experimental behavior of reinforced concrete beams strengthened with prestressed CFRP shear straps 

    Kesse, GK; Lees, Janet Marillyn (American Society of Civil EngineersJournal of Composites for Construction (ASCE), 2007)
    One promising means of increasing the capacity of existing shear-deficient beams is to strengthen the structure using external prestressed carbon fiber reinforced polymer (CFRP) straps. In this system, layers of CFRP tape ...

  • External prestressed carbon fiber-reinforced polymer straps for shear enhancement of concrete 

    Lees, Janet Marillyn; Winistoerfer, AU; Meier, U (American Society of Civil EngineersJournal of Composites for Construction (ASCE), 2002)
    The use of fiber-reinforced polymers (FRPs) for the strengthening and repair of existing concrete structures is a field with tremendous potential. The materials are very durable and, hence, ideally suited for use as external ...

  • Fibre-reinforced polymers in reinforced and prestressed concrete applications: moving forward 

    Lees, Janet Marillyn (John Wiley & Sons, Ltd.Progress in Structural Engineering and Materials, 2001)
    Recent developments in the use of fibre-reinforced polymers (FRPs) in reinforced and prestressed concrete applications are reviewed. The influence of FRP material properties on the design of concrete structures is considered ...

  • Flexural Fatigue Performance of CFRP Prestressed Concrete Poles 

    Roberts, EE; Lees, Janet Marillyn; Hoult, NA (Multi-Science PublishingAdvances in Structural Engineering, 2012-04-24)
    Carbon fibre reinforced polymer (CFRP) prestressed concrete poles offer a durable, light-weight alternative to conventional steel-reinforced or prestressed concrete poles. In particular, the corrosion resistance of the ...

  • Modelling of an unbonded CFRP strap shear retrofitting system for RC beams 

    Hoult, Neil Anthony; Lees, Janet Marillyn (American Society of Civil EngineersASCE Journal of Composites for Construction, 2009)
    A retrofitting technique has been developed that uses carbon fiber-reinforced polymer (CFRP) straps to increase the shear capacity of reinforced concrete beams. The vertical straps are not bonded to the beam but are instead ...

  • Non-laminated FRP Strap Elements for Reinforced Concrete, Timber and Masonry Applications 

    Lees, Janet Marillyn; Winistörfer, AU (American Society of Civil EngineersJournal of Composites for Construction, 2010-05-11)
    Advances in material technology allow for the exploration of new structural forms and systems. In recent years, fiber-reinforced polymers (FRPs) have emerged as candidate materials for civil engineering applications, and ...

  • Nonlinear FE analysis of cracks in tension and shear 

    Kesse, G; Lees, Janet Marillyn (Institute of Civil EngineersMagazine of Concrete Research, 2007-05-01)
    Smeared-crack finite element (FE) analyses of reinforced-concrete beams strengthened with prestressed carbonfibre-reinforced polymer (CFRP) shear straps have shown that, at high load levels, the stresses in the straps ...

  • Phased Nonlinear Finite-Element Analysis of Precracked RC T-Beams Repaired in Shear with CFRP Sheets 

    Dirar, Samir; Lees, Janet Marillyn; Morley, Chris (American Society of Civil EngineersJournal of Composites for Construction, 2012-10-17)
    Phased nonlinear finite-element (FE) analyses were carried out to predict the behavior of precracked reinforced concrete (RC) T-beams repaired in shear with externally bonded (EB) carbon fiber–reinforced polymer (CFRP) ...

  • Precracked RC T-beams Repaired in Shear with Prestressed CFRP Straps 

    Dirar, Samir; Lees, Janet Marillyn; Morley, Chris T (American Concrete InstituteACI Structural Journal, 2013-09-01)
    The results of an experimental and numerical investigation involving unstrengthened reinforced concrete (RC) T-beams and precracked RC T-beams strengthened in shear with prestressed carbon fiber-reinforced polymer (CFRP) ...

  • Rectangular Reinforced Concrete Beams Strengthened with CFRP Straps 

    Yapa, Hiran D; Lees, Janet Marillyn (American Society of Civil EngineersJournal of Composites for Construction, 2013-07-13)
    Shear deficient reinforced concrete (RC) structures can be effectively strengthened using external prestressed carbon fibre reinforced polymer (CFRP) straps. Due to the presence of the external elastic straps, a strengthened ...

  • Time-Dependent Behavior of RC Beams Retrofitted with CFRP Straps 

    Hoult, Neil A; Lees, Janet Marillyn (American Society of Civil EngineersJournal of Composites in Construction, 2010-07-16)
    A retrofitting technique that uses prestressed unbonded carbon-fiber-reinforced polymer (CFRP) straps to provide additional shear capacity has previously been shown to be successful under short-term static loading conditions. ...

  • Transfer bond stresses generated between FRP tendons and concrete 

    Lees, Janet Marillyn; Burgoyne, Christopher John (Institute of Civil EngineersMagazine of Concrete Research, 1999)
    There is a growing interest in the use of new materials in construction. Materials such as fibre-reinforced plastics (FRPs) are lightweight, strong, and, for the most part, non-corrodible. Hence, the use of FRPs as ...

  • Uptake induced swelling and thermal expansion of CFRP tendons 

    Scott, P; Lees, Janet Marillyn (Institute of Civil EngineersProceedings of ICE, Structures and Buildings, 2009)
    Carbon-fibre-reinforced polymer (CFRP) tendons can be used as a corrosion-resistant alternative to steel for reinforcing or prestressing concrete in aggressive marine environments. The design lives of many civil marine ...

  • Water, salt water and alkaline solution uptake in epoxy thin films 

    Scott, P; Lees, Janet Marillyn (WileyJournal of Applied Polymer Science, 2013-05-10)
    As a means of characterizing the diffusion parameters of fiber reinforced polymer (FRP) composites within a relatively short time frame, the potential use of short term tests on epoxy films to predict the long-term behavior ...