Finite Element Analysis Of Bond Characteristics At The Frp Concrete Interface

Download or read book Finite Element Analysis of Bond Characteristics at the FRP-concrete Interface written by Mani Balazadeh Minouei and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Reinforced concrete structures are prone to corrosion in harsh environments. Fibre-Reinforced Polymer (FRP) laminates are more resistant than steel elements, such as bars and plate in aggressive environments; they can be used as a barrier to protect concrete structures; however, poor bond between FRP composite laminates and structural concrete can prevent utilizing the full structural and protective capacity of FRP-concrete composite system, therefore, it is important to develop good bond between concrete and the FRP to ensure the integrity and durability of the FRP-concrete system. There is a need to understand the bond characteristics at the FRP laminates-concrete interface, and the various parameters influencing the bond performance of the composite system. This research program consists of numerical modeling of the double lap pull-off tests conducted by Ali et.al (2012) and comparing the computed values with the experimental results for two different batches, along with an evaluation of the various parameters influencing bond between FRP laminates and concrete. The ABAQUS 6.10.1 program was used to model the double lap pull-off test. Shell elements were used to model FRP laminates, solid elements for concrete and steel and cohesive elements for modeling the epoxy joint. The constitutive models for the materials were selected based on their experimental behavior. A linear elastic model was used for modeling FRP laminates and steel, elastoplastic behavior was used for modeling epoxy and damaged plasticity model was used for modeling concrete.Numerical and experimental curves reflected similar responses. In the first batch the average ultimate load in the tests was 70.7 kN , while the ultimate load for the numerical analysis was 73.8 kN, showing a difference of 4.6% . Also, the average experimental value of strain at the center of the FRP laminate was 2657x[(10)]^(-6), while the ultimate strain in numerical simulation was 3023x[(10)]^(-6), showing an acceptable difference of 12.1 %. In the second batch, the average of experimental ultimate load was 54.5kN, while the ultimate load in numerical analysis was 58.6kN, with a difference of only 5.4%. The computed ultimate strain is 2320 x[(10)]^(-6), while the average of ultimate strain in experimental study was 2173x[(10)]^(-6), showing a discrepancy of 6.3%. Also, the effect of different geometrical factors on the bond behavior of FRP and concrete was studied; it was concluded that, the most effective geometrical parameter influencing bond between FRP and concrete was the bonded width of the FRP laminate." --