relation: http://eprints.imtlucca.it/1932/
title: Delamination in FRP-strengthened structures: acoustic emission monitoring and numerical modeling
creator: Lacidogna, Giuseppe
creator: Paggi, Marco
creator: Carpinteri, Alberto
subject: TJ Mechanical engineering and machinery
description: A case study concerning both numerical modeling and in-situ monitoring of a retrofitted RC beam  with non-rectangular cross-section is presented. Before retrofitting, non-destructive techniques,  such as pull-out and impact tests, were used to estimate the mechanical parameters of concrete. At  the same time, a long-term monitoring with the Acoustic Emission (AE) technique was carried out  in order to investigate on creep effects and microcracking phenomena. Then, after a complete  removal of the overload and retrofitting with FRP sheets, an in-situ loading test was performed. At  that stage, the AE technique was again profitably used for the analysis of the cracking progression  leading to FRP debonding. A numerical model of the structure is then proposed in the framework  of the FE discretization with mechanical parameters estimated according to an inverse analysis on  the monitored mechanical behavior of the structure before retrofitting. According to this model, it  is clearly demonstrated that, when the flexural inertia of the retrofitted beam is considerably  higher than that of the unrepaired beam, snap-back instabilities can take place. Finally,  considering the self-similarity between the acoustic emission phenomenon and seismicity, an  analogy between the snap-back instability of the FRP delamination and that occurring during fault  growth is proposed.
publisher: Firenze University Press
date: 2005
type: Book Section
type: PeerReviewed
identifier:   Lacidogna, Giuseppe and Paggi, Marco and Carpinteri, Alberto  Delamination in FRP-strengthened structures: acoustic emission monitoring and numerical modeling.   In:  AIMETA 2005 : atti del XVII Congresso dell’Associazione italiana di meccanica teorica e applicata : Firenze, 11-15 settembre 2005.   Firenze University Press.  ISBN 88-8453-313-9      (2005)