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Behaviour Assessment Of Reinforced Concrete Columns Externally Rehabilitated With Carbon Fiber-reinforced Polymers (cfrps) Subjected To Eccentric Loadings

Submitted2020-03-16
Last Update2020-03-16
TitleBehaviour Assessment Of Reinforced Concrete Columns Externally Rehabilitated With Carbon Fiber-reinforced Polymers (cfrps) Subjected To Eccentric Loadings
Author(s)Author #1
Author title:
Name: Mohammad Alhawamdeh
Org: Master Student, Department of Civil Engineering, The University of Jordan, Amman 11942, Jordan
Country:
Email:

Author #2
Author title:
Name: Maha Alqam
Org: Associate Professor, Department of Civil Engineering, The University of Jordan, Amman 11942, Jordan
Country:
Email: m.alqam@ju.edu.jo

Other Author(s)
Contact AuthorAuthor #2
Alt Email: m.alqam@ju.edu.jo
Telephone:
KeywordsRC columns, CFRP, Rehabilitation, Eccentricity, Uniaxial bending, Strength
AbstractRehabilitating of concrete columns with Carbon Fiber-Reinforced Polymer (CFRP) under axial load has been extensively covered in the past and has proven to be an effective method of enhancing the strength and the ductility of reinforced concrete columns. The main objective of this investigation is to assess the effectiveness of utilizing CFRP in short reinforced concrete columns subjected to eccentric loadings. An experimental study using twelve 150 mm x 150 mm x 900 mm short reinforced concrete columns, consisting of six control specimens and six CFRP-rehabilitated specimens, was carried out using eccentricities of 15 mm, 30 mm and 45 mm on the subject columns. The columns were designed using the ACI 318-14 building code. Rehabilitation and wrapping were carried out using the provisions of ACI 546, ACI 503 and ACI 440, where the columns were strengthened using a single-layer wrap of carbon fiber composites. Testing was carried out under a uniaxial eccentric compressive loading servo machine up to failure, where the P-Delta relationship was recorded via a data acquisition system. The results showed an improved load-carrying capacity and a significant improvement in ductility when compared to the control specimens. Based on the test results, load-carrying capacity was observed to increase by 22.5% to 37.2% when the eccentricity increased from 15 mm to 45 mm, respectively. On the other hand, maximum deflection (i.e., Delta) increased by 24% to 15% for eccentricities respectively ranging between 15 mm and 45 mm. Generally speaking, the load´┐Żdeflection curves of the rehabilitated columns showed a stiffening trend and ductility reduction when the eccentricity was increased.
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