Structural behaviour of recycled aggregate concrete filled steel tube columns strengthened by CFRP

Dong, Jiangfeng; Wang, Hongtao; Guan, Zhongwei

doi:10.1016/j.engstruct.2012.11.006

Cited by 105 publications

(29 citation statements)

References 39 publications

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“…In rectangular columns, with the increasing of the CFRP layer number, load capacity had no obvious changes, but the ductility could be improved. There are more experimental and analytical studies on the compressive behavior of the CFST columns strengthened with FRP in [10][11][12]. To obtain a further understanding of the confining mechanism of FRP wrap in FCCFST columns, Teng et al [13] developed a stress-strain model for concrete in FCCFST columns under compression through theoretical analysis.…”

Section: Introductionmentioning

confidence: 99%

Behavior of FRP-Confined Concrete-Filled Steel Tube Columns

2014

Polymers

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This paper presents the results of an experimental study into the behavior of concrete-filled steel tube columns confined by fiber-reinforced polymer (FRP). Eleven columns were tested to investigate the effects of the FRP layer number, the thickness of the steel tube and concrete strength on their load capacity and axial deformation capacity. The experimental results indicated that the FRP wrap can effectively confine the concrete expansion and delay the local buckling of the steel tube. Both the load capacity and the axial deformation capacity of concrete-filled steel tube columns can be substantially enhanced with FRP confinement. A model is proposed to predict the load capacity of the FRP-confined concrete-filled steel tube columns. The predicted results are generally in good agreement with the experimental ones obtained in this study and in the literature.

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Section: Introductionmentioning

confidence: 99%

Behavior of FRP-Confined Concrete-Filled Steel Tube Columns

2014

Polymers

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“…The RCA was obtained by crushing waste concrete taken from collapsed concrete structures in Dujiangyan after the Sichuan earthquake on 12 May 2008. This was one of the most destructive earthquakes in modern Chinese history, generating approximately 382 Mt of construction waste from collapsed buildings (Dong et al, 2013). The water absorption rate of RCA should not be more than 3% (Choi and Yun, 2012) Material and structural response of steel tube confined recycled earthquake waste concrete subjected to axial compression Dong, Wang and Guan conformed to this limit, as shown in Table 3.…”

Section: Natural and Recycled Coarse Aggregatesmentioning

confidence: 95%

Material and structural response of steel tube confined recycled earthquake waste concrete subjected to axial compression

Dong¹,

Wang²,

Guan³

2016

Magazine of Concrete Research

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This paper reports on an experimental study of the mechanical properties of recycled aggregate concrete (RAC) and the structural behaviour of steel tube columns filled with RAC subjected to axial compressive loading. A total of ten specimens were tested to investigate the influence of the steel tube configuration (circular or square), the type of concrete (normal concrete or RAC) and the proportion of recycled coarse aggregate (RCA) used in the RAC. The mechanical properties of RAC and RAC columns confined by steel tubes were studied for RCA replacement ratios of 0, 25, 50, 75 and 100%. The results show that RAC may give a slightly lower strength during the first 28 d of curing.However, the ultimate strength (90 d curing) of steel tubes filled with RAC was slightly higher than those filled with normal concrete. The load-carrying capacity of circular steel tube columns filled with RAC was found to be higher than that of square section tubes. Theoretical calculations of the load-carrying capacity of the concrete-filled steel tube columns are presented and compared with experimental results.

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“…Besides the aforementioned tests, Dong et al (2013) experimentally investigated the static behaviour of axially loaded RACFST columns externally strengthened with carbon fibre reinforced polymer sheet.…”

Section: Summary Of Experimental Research Outcomesmentioning

confidence: 99%

Behaviour and design calculations of recycled aggregate concrete-filled steel tube (RACFST) members

Yang

Hou

2015

Magazine of Concrete Research

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This paper describes research work on the performance and design calculations of recycled aggregate concrete filled steel tube (RACFST) members, especially the most recent developments in China. Firstly, experimental studies on RACFST members subjected to short-term static loading, long-term sustained loading and cyclic flexural loading are summarised and analysed, and recent advances in the behaviour of RACFST stub columns after exposure to high temperatures (300-8008C) are also reviewed. The experimental results show that, in general, RACFST members have similar performance to concrete filled steel tube (CFST) members when subjected to the same loading conditions. However, due to the more serious inherent defects of recycled aggregate concrete compared with normal concrete, RACFST members have a lower bearing capacity and stiffness than their CFST counterparts. Secondly, design formulae for RACFST members are suggested and the calculated bearing capacities using the simplified equations generally agree well with the experimental results. Finally, the potential research needs of RACFST structures are discussed. NotationA c cross-sectional area of concrete A s cross-sectional area of steel A sc cross-sectional area of RACFST column D outside diameter of circular steel tube or width of square steel tube e load eccentricity f ck,r characteristic compressive strength of recycled aggregate concrete (RAC) f cu,r cube compressive strength of RAC f scy,r strength factor f y yield strength of steel k T strength reduction factor considering the effect of maximum temperature L effective buckling length of member in the plane of bending M moment M u flexural capacity of RACFST beam M uc calculated flexural capacity of RACFST beam M ue experimental flexural capacity of RACFST beam N axial compressive load N 0 cross-sectional strength N E Euler critical force N u bearing capacity of RACFST column under concentric compression N uc calculated bearing capacity N ue experimental bearing capacity N ue,cfst bearing capacity of CFST specimens N ue,racfst bearing capacity of RACFST specimens N ue,w bearing capacity of specimens with long-term sustained loading N ue,wo bearing capacity of specimens without long-term sustained loading N u,T strength of RACFST stub columns after exposure to high temperature n long-term sustained load ratio n 0 axial compressive load ratio r unified recycled aggregate replacement ratio r c recycled coarse aggregate replacement ratio r f recycled fine aggregate replacement ratio T m maximum temperature t wall thickness of steel tube W sc section modulus of RACFST member AE steel ratio ª m flexural capacity factor ç 0 intermediate variable º slenderness ratio º o slenderness ratio limit for elastic-plastic buckling of RACFST member under concentric compression º p slenderness ratio limit for elastic buckling of RACFST member under concentric compression î r confinement factor r 0 intermediate variable ö stability factor 611

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Structural behaviour of recycled aggregate concrete filled steel tube columns strengthened by CFRP

Cited by 105 publications

References 39 publications

Behavior of FRP-Confined Concrete-Filled Steel Tube Columns

Behavior of FRP-Confined Concrete-Filled Steel Tube Columns

Material and structural response of steel tube confined recycled earthquake waste concrete subjected to axial compression

Behaviour and design calculations of recycled aggregate concrete-filled steel tube (RACFST) members

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