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Author(s): Pedro Delgado
Patrício Rocha
João Pedrosa
António Arêde
Nelson Vila Pouca
Miguel Santos
Aníbal Costa
Raimundo Delgado
Title: Retrofitting of bridge hollow piers with CFRP
Issue Date: 2007
Abstract: Hollow bridge piers generally have large section dimensions, with reinforcement barsspread along both wall faces. Unlike common solid section columns, quite often the shear effect hasgreat importance on the pier behavior. Therefore, it is of particular relevance that special attention isgiven to this issue when the assessment and retrofit of RC hollow section piers is envisaged. Representativeof typical bridge construction, RC piers were tested at LESE the Laboratory of Earthquakeand Structural Engineering of the Faculty of Engineering of University of Porto. Experimental tests ofhollow section piers with square and rectangular cross sections under cyclic loading are being carriedout in order to compare the results of the original piers and CFRP retrofitted piers, regardingbenefits on their structural behavior and comparing the results with analytical predictions. Theadopted numerical methodologies are based on finite element analysis using 3D elements with a ContinuumDamage Mechanics model for the concrete under tensile and compressive reversals and trusselements with the Menegotto-Pinto model for the cyclic behavior of steel reinforcement. For differentrectangular cross sections, the interaction between pier walls is likely to affect their global behaviorand damage. The main purpose of this paper is therefore to present several strategies of retrofit withCFRP in order to prevent shear or flexural collapse mechanisms, or both. Different amounts of striplayers were applied for shear retrofit and jacket confinement near the pier base section was adoptedfor increasing ductility. It is intended to assess the structural behavior and safety improvement due tothe adoption of different CFRP retrofit techniques and to illustrate the external and internal damagepattern. The need of interior retrofit is discussed on the basis of experimental evidence from some ofthe tests; therefore a strategy of internal confinement is also presented in order to prevent interiorconcrete spalling and longitudinal rebar buckling.
Subject: Engenharia estrutural, Engenharia civil
Structural engineering, Civil engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia civil
Engineering and technology::Civil engineering
Source: Proceedings of ECCOMAS Thematic Conference "Computational Methods in Structural Dynamics and Earthquake Engineering
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: openAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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