Author : Omkar Tipnis
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (927 download)
Book Synopsis Numerical and Analytical Modeling of Concrete Confined with Frp Wraps by : Omkar Tipnis
Download or read book Numerical and Analytical Modeling of Concrete Confined with Frp Wraps written by Omkar Tipnis and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is intended at studying and comparing empirical models that have been proposed for the modeling of the stress-strain response of a FRP confined concrete subjected to axial load. An attempt has been made to model the experimental set up for the compression test of a concrete cylinder confined with FRP sheet in AbaqusCAE. The results so obtained have been compared and analyzed against the experimental test results & the results obtained from a chosen mathematical model (Modified Lam & Teng). An attempt was made to create a new material model in Opensees that follows the chosen mathematical model. However, this was not achieved due to the reasons that will be explained in the later sections.Reinforced concrete confined with steel is typically designed by considering the Manders model (Mander et al., 1988), which assumes a constant confining pressure. This is true with the case of steel as it is a ductile material and one assumes the steel to be yielded. However with the case of FRP jackets, this is not true. FRP is a linear elastic and brittle material and does not yield, which makes the Manders model inaccurate for its analysis. Many models have been proposed which take into account the increasing confining pressure due to the FRP wrap. A comparative study of the constitutive models proposed for FRP confined reinforced concrete has been done in this study.Finally after a series of numerical interpretations of different specimens and their comparison with the experimental data, the utility and accuracy of the new modified Lam & Teng's model was validated. The validation process included comparison and analytical data obtained via finite element simulation in Abaqus, empirical model results and the experimental data.The objective is achieved and restricted within the following scope of study:1)Literature review to identify and choose the most relevant models for modeling of concrete confined with fiber reinforced polymers in compression.2)Modelling and finite element analysis of the confined concrete compression test in AbaqusCAE.3)Developing the stress-strain curve from several proposed empirical model (Modified Lam & Teng).4)Survey of experimental data on confined concrete with FRP in order to generate an experimental database.5)Comparison of the analytical results in order to define the strengths and limitations of the empirical model chosen to study.6)Validation of the model chosen and a study on its relevance for use in typical bridge columns retrofitted with FRP jackets.7)Proposing changes to the empirical model for more accurate results.8)Validate the effects of the proposed changes.