Seismic behavior of corrosion-damaged reinforced concrete columns strengthened using combined carbon fiber-reinforced polymer and steel jacket

Li, Jinbo; Gong, Jinxin; Wang, Licheng

doi:10.1016/j.conbuildmat.2009.01.003

Cited by 171 publications

(78 citation statements)

References 11 publications

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“…Meanwhile, the anchored dowel bar showed its essential role in resisting lateral force; by linking the column and footing with anchored dowel bars, the lateral performance of the column such as ultimate stress, initial stiffness, and displacement ductility were all enhanced by at least 20%. Li et al [18] also reported an experimental investigation on the corrosion-damaged RC columns strengthened with a combined CFRP sheet and steel jacket, which indicated a better effectiveness than the columns strengthened with only CFRP sheets or steel jacket in terms of strength and ductility. Conventional jacketing methods could enhance the flexural strength, shear strength, or even ductility of columns but with unneglectable drawbacks, such as high cost, low efficiency, and poor durability.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Seismic Behavior of Underwater Bridge Columns Strengthened with Prestressed Precast Concrete Panels and Fiber-Reinforced Polymer Reinforcements

Tang

Sun

2018

International Journal of Polymer Science

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The seismic performance of the bridge column, such as pier or pile, is a time-dependent property which may decrease in resistance to the deterioration or natural hazards along the structure's service life. The most effective strengthened method for degraded bridge columns is the jacketing method, which has been widely developed and investigated through numerous studies since the 1980s. This paper presented a modeling method, as well as a comprehensive parametric study, on seismic performance of bridge columns strengthened by a newly developed strengthening method with prestressed precast concrete panels and fiber-reinforced polymer reinforcements (PPCP-FRP). A modeling method of bridge columns strengthened with PPCP-FRP was first presented and validated with test results. The influence of design parameters, such as axial load ratio, equivalent FRP reinforcement ratio rate (EQFRR), expansion ratio, and shear span ratio of strengthened columns, were then further evaluated in terms of lateral load capacity, ductility, energy dissipation, lateral stiffness, and residual displacement of strengthened columns. The peak load of strengthened columns increases with the increasing of EQFRR due to the unique failure model of strengthened columns characterized by the fracture of FRP bars. The initial stiffness of strengthened columns increased by 300% with the increasing of expansion ratio by 45%, and a stable postyield stiffness stage was obtained by most strengthened columns in analysis. The residual displacement of strengthened columns decreases rapidly with the increasing of EQFRR, which indicated that a better repairability could be achieved by the strengthened column with a relatively high EQFRR.

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Section: Introductionmentioning

confidence: 99%

Numerical Study on Seismic Behavior of Underwater Bridge Columns Strengthened with Prestressed Precast Concrete Panels and Fiber-Reinforced Polymer Reinforcements

Tang

Sun

2018

International Journal of Polymer Science

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“…If the column is classified as a long column in which its cross-sectional dimensions are small compared with its length, then the propagated bending moments should be taken into consideration [1]. The main causes of the damaged concrete columns are the brittle behaviour, insufficient resistance to the shear transverse and relatively small length of lap-spliced of the hoops [2] [3] [4]. In some cases, the aforementioned factors combined, and then complete failure is occurred.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Reinforced Concrete Columns Strengthened with Ferrocement under Compression Conditions: Experimental Approach

Al-Sibahy¹

2016

WJET

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This paper reports a study based upon experimental investigation which aims to assess the behaviour of reinforced concrete columns strengthened with a new configuration of steel wire mesh as part of ferrocement layer under the action of axial compression loads. Square and circular small scale columns with three different slenderness ratios of 5, 6.7 and 10 were adopted. A comprehensive experimental progarmme was then running to measure the load capacity and both lateral and vertical displacements. The failure mode was also monitored for each tested case. The results obtained was compared with the reference column samples (without wire mesh) and with some expressions suggested by ACI Code. The experimental results showed that the most influential parameter on the property of load carrying capacity is the slenderness of column. As the slenderness increases, the load capacity clearly decreases. The use of wire mesh enhanced the capability of column to resist the axial loads due to confinement role provided by such material. The maximum percentage increase in load carrying capacity for the modified columns compared with those for the reference samples was 53% for the circular column at slenderness ratio of 10. The critical path of the failure mode was similar for all of the tested columns and normally began from the top or bottom ends, then, in some cases, passed through the middle zone of the column. A suitable expression was suggested to be used for calculating the modulus of elasticity of the tested column based upon the value of load carrying capacity under compression loads.

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“…In the last three decades, there has been a widespread in the number and type of strengthening columns. Strengthening by using steel elements has been observed with several experimental studies (Frangou et al 1995;Montuori and Piluso 2009;Li and Gong 2009;Papia et al 1988;Ramirez et al 1997;Campione and Minafo 2010;Adam et al 2008). Many theoretical models have been conducted to investigate the behavior of confined and unconfined axially loaded reinforced concrete columns (Mander et al 1988;Campione 2008).…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical behavior of strengthened reinforced concrete columns with steel angles and strips

Khalifa

Al-Tersawy

2014

Int J Adv Struct Eng

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The need of strengthening reinforced concrete columns, due to loss of strength and/or stiffness, is an essential requirement due to variation of the loads and environmental conditions applied on these columns. Steel jackets around the reinforced concrete (RC) columns are usually made by means of steel plates covering all over the column surface area. For the value of engineering purposes, another technique was developed using steel angles at the corners of the RC columns connected with discrete steel strips. In this paper, an experimental program is designed to evaluate the improvement in loadcarrying capacity, stiffness and ductility of strengthened RC columns, concomitant with steel angles and strips. Despite of prevailing a substantially increased loading capacity and strength a pronounced enhancement in ductility and stiffness has been reported. A need for experimental test results with low value of concrete strength to mimic the local old-age structures condition that required strengthening in local countries. Seven columns specimens are tested to evaluate the strength improvement provided by steel strengthening of columns. The method of strengthened steel angles with strips is compared with another strengthening technique. This technique includes connected and unconnected steel-casing specimens. The observed experimental results describe load-shortening curves, horizontal strains in stirrups and steel strips, as well as description of failure mode. The extra-confinement pressure, due to existence of steel cage, of the strengthened RC column can be also observed from experimental results. The code provisions that predict the load-carrying capacity of the strengthened RC composite column has a discrepancy in the results. For this reason, an analytical model is developed in this paper to compare the code limit with experimental observed results. The proposed model accounts for the composite action for concrete confinement and enhancement of the local buckling of steel elements. This adopted model is simplified and applicable to practical design field. In this respect, the experimental results and those of the analytical model showed a good agreement. Research significanceThis paper intended to perform an experimental investigation to examine the enhancement of strengthened RC columns, using steel angles and strips. The code provisions that predict the load-carrying capacity of the strengthened RC composite column has a discrepancy in the results. A need was required for experimental studies to compare the analytical model with the code limit. Thus, seven specimens have been developed to investigate the load-carrying capacity, stiffness and strength enhancement of the strengthened columns. The experimental results quietly addressed the load-shortening curve, horizontal strains in stirrups and strips. A comparison between strengthened RC column with steel angles and strips with those columns strengthened with steel-casing was developed. The obtained experimental results were compared with the code limi...

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Seismic behavior of corrosion-damaged reinforced concrete columns strengthened using combined carbon fiber-reinforced polymer and steel jacket

Cited by 171 publications

References 11 publications

Numerical Study on Seismic Behavior of Underwater Bridge Columns Strengthened with Prestressed Precast Concrete Panels and Fiber-Reinforced Polymer Reinforcements

Numerical Study on Seismic Behavior of Underwater Bridge Columns Strengthened with Prestressed Precast Concrete Panels and Fiber-Reinforced Polymer Reinforcements

Behaviour of Reinforced Concrete Columns Strengthened with Ferrocement under Compression Conditions: Experimental Approach

Experimental and analytical behavior of strengthened reinforced concrete columns with steel angles and strips

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