Behavior of large-size FRP-jacketed circular and rectangular reinforced concrete columns

Pao Yue-kong Library Electronic Theses Database

Behavior of large-size FRP-jacketed circular and rectangular reinforced concrete columns


Author: Zhang, Yue-xin
Title: Behavior of large-size FRP-jacketed circular and rectangular reinforced concrete columns
Degree: M.Phil.
Year: 2013
Subject: Fiber reinforced concrete.
Fiber reinforced plastics.
Reinforced concrete construction.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Environmental Engineering
Pages: xvi, 225 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record:
Abstract: It is well known that concrete can achieve higher strength and greater ductility when subjected to triaxial compression. In structures, concrete is laterally confined in various ways to enhance its strength and ductility. The most widely used concrete confining method is to use transverse steel reinforcement in reinforced concrete (RC) structural members. More recently, fiber reinforced polymer (FRP) jackets have been widely used to strengthen existing RC columns. FRP, being a high-strength, lightweight and corrosion-resistant material with direction-dependent properties, is more advantageous than steel jackets in column strengthening applications. Despite the extensive existing research on the behavior of FRP-confined concrete columns, there is a significant deficiency in existing work on the behavior of FRP-confined large-scale/full-scale RC columns of square/rectangular sections. To address this deficiency, the present thesis presents an experimental study into the axial compressive behavior of FRP-jacketed full-scale RC columns. The specimens were designed according to existing design guidelines to have realistic features. A total of 18 full-scale RC column specimens (350 mm diameter circular columns, 350 mm × 350 mm square columns, 290 mm × 435 mm and 250 mm × 500 mm rectangular columns), all with a height of 1340 mm, were built and tested under axial compression. The columns (including 1 trial test) had circular, square and rectangular sections, with and without confinement by carbon FRP (CFRP) jackets. The circular columns were reinforced with transverse steel reinforcement of different volumetric ratios and were confined with CFRP jackets of different thicknesses to study the effects of transverse steel reinforcement, FRP confinement and their interaction. For square columns, the effects of the volumetric ratio of transverse steel reinforcement and the FRP jacket thickness are also studied. One additional purpose of the square column tests was to study the effect of the rounded corner radius of the square section. Finally, some rectangular columns were tested to study the influence of the section aspect ratio. The test data are interpreted and compared to theoretical predictions of representative models for FRP-confined RC columns. These comparisons indicate the inadequacy of existing models, particularly in predicting the behavior of large FRP-confined square and rectangular RC columns. That is, the existing models have not properly captured the size effect of these columns.

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