Performance evaluation of intermittently CFRP wrapped square and circularised square reinforced concrete columns under different loading conditions

Duc, Anh; Sheikh, M. Neaz; Hadi, Muhammad N.S.

doi:10.1080/15732479.2019.1572201

Cited by 15 publications

(5 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The characteristics of failure for the column specimens, with and without simultaneous sustained concentric axial load and reinforcement corrosion, were demonstrated in Figure 8 . As can be seen from Figure 8 , irrespective of different degrees of reinforcement corrosion or sustained loading conditions, the failure of RC columns was basically due to the spalling of the concrete cover around the mid-height, followed by the buckling of the main rebar [ 52 , 53 , 54 ].…”

Section: Resultsmentioning

confidence: 99%

“…The results of the specimens tested were summarized in Table 3 . The ductility ( D ) of the column specimens was determined by Equation (2) [ 52 , 53 , 55 ]:

where ξ 0.85 is the axial deformation corresponded to the 85% of the ultimate axial load in the descending part of the axial load–axial deformation response, and ξ y is the yield axial deformation which is determined as the axial deformation corresponded to the intersection point of two lines. One is the extension line between the origin and the point representing 75% of the ultimate axial load in the ascending part of the axial load–axial deformation response.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Reinforcement Corrosion and Sustained Load on Mechanical Behavior of Reinforced Concrete Columns

Dong

et al. 2022

Materials

View full text Add to dashboard Cite

The effects of reinforcement corrosion and sustained axial load on mechanical performance of reinforced concrete (RC) columns were investigated in the present study. Three different degrees of reinforcement corrosion were achieved by controlling the durations of accelerated corrosion test (i.e., 16 days, 31 days, and 63 days). Three levels of sustained axial load (i.e., 0%, 30%, and 60% of the ultimate bearing capacity) were concentrically applied on column specimens. The impressing current and the sustained load were applied on column specimens simultaneously, mimicking the degradation of RC columns in real structures. Results indicated that transverse stirrups yielded higher corrosion degree than that of the longitudinal rebar under identical duration of accelerated corrosion test. The application of sustained axial load improved the performance of corroded RC columns in terms of the reinforcement corrosion, the ultimate axial load, as well as the stiffness. Additionally, more longitudinal cracks along the main rebar were exhibited for column specimens subjected to sustained axial load. For both loaded and unloaded column specimens, corrosion of reinforcing steels exacerbated the mechanical deterioration of RC columns, lowering the ultimate load carrying capacity and the axial deformation compared to the uncorroded columns.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The results of the specimens tested were summarized in Table 3 . The ductility ( D ) of the column specimens was determined by Equation (2) [ 52 , 53 , 55 ]:

Section: Resultsmentioning

confidence: 99%

Effects of Reinforcement Corrosion and Sustained Load on Mechanical Behavior of Reinforced Concrete Columns

Dong

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…The ductility (μ) of the specimens was calculated as the ratio of the ultimate axial deformation or midspan deflection (∆ u ) to the yield axial deformation or midspan deflection (∆ y ), in accordance with Hadi et al 26 and Mai et al 39 The ∆ y was considered at the intersection between a best‐fit regression line corresponding to the ascending part of the load‐deformation curve and a horizontal line corresponding to Peak‐1 load. For the steel‐HC specimens, the ∆ u was considered corresponding to the 85% drop in the Peak‐1 load at the descending branch of the curve.…”

Section: Analysis Of Experimental Resultsmentioning

confidence: 99%

Experimental investigation on the use of glass fiber reinforced polymer reinforcement in hollow‐core circular concrete columns

Ahmad

Sheikh

Hadi

2021

Structural Concrete

Self Cite

View full text Add to dashboard Cite

This paper presents the results of an experimental investigation on the behavior of glass fiber reinforced polymer (GFRP) bar-reinforced hollow-core (GFRP-HC) circular concrete specimens under concentric, 25 mm and 50 mm eccentric axial loading and four-point bending. The main parameters investigated include the type of reinforcing bars, pitch of the helices and loading conditions. The test matrix of this study consists of 12 specimens, among which nine specimens (850 mm high) were tested under concentric and eccentric axial loading and the remaining three specimens (1500 mm long) were tested under four-point bending. The specimens were circular in cross-section with an outer diameter of 214 mm and an inner circular hole diameter of 56 mm. The experimental results showed that, for the similar amount of reinforcement, steel bar-reinforced hollow-core (steel-HC) specimens sustained higher loads than the GFRP-HC specimens under different loading conditions. Also, the steel-HC specimens achieved higher ductility than the GFRP-HC specimens under 50 mm eccentric axial loading and four-point bending. However, under concentric and 25 mm eccentric axial loading, the GFRP-HC specimens achieved higher ductility than the steel-HC specimens. The close pitch of the GFRP helices significantly enhanced the load carrying capacity and ductility of the GFRP-HC specimens. K E Y W O R D Sconcentric axial load, eccentric axial load, glass fiber reinforced polymer bar, glass fiber reinforced polymer helix, hollow-core columns, reinforced concrete

show abstract

“…Mai et al [87] presented the results of an experimental investigation on square and circularized square RC columns intermittently wrapped with CFRP jackets under different loading conditions. Twelve RC specimens consisting of eight square RC specimens with a 150-mm × 150-mm cross-section and an 800-mm height and four circularized square RC columns with a 212-mm diameter and an 800-mm height were tested under a concentric axial load, eccentric axial load and four-point flexural load.…”

Section: Section Circularization and Section Ellipticalizationmentioning

confidence: 99%

Fiber-Reinforced Polymer-Confined Non-Circular Columns with Shape Modification: A Comprehensive Review

Zeng

2022

Polymers

View full text Add to dashboard Cite

The implementation of shape modification (SM) to reinforced concrete (RC) columns has been demonstrated to be effective when enhancing the effectiveness of the fiber-reinforced polymer (FRP) confinement of the columns, particularly for non-circular columns. The SM approach generally includes modifying a square section into a circular one, modifying a rectangular section into an elliptical/oval one and modifying a square/rectangular section into a curvilinearized square/rectangular section. In this paper, a state-of-the-art review of studies on FRP-confined non-circular columns with SM is conducted. The effects of key parameters on the effectiveness of FRP confinement are discussed, and different methods for the implementation of SM in real applications are briefly introduced. The findings of the review further confirm the effectiveness of the SM approach, and the test results demonstrate the effectiveness and advantages of section curvilinearization with a limited increase in cross-sectional area. Additionally, existing theoretical models for FRP-confined concrete in columns with SM are summarized. Further research opportunities associated with FRP-confined non-circular columns with SM are identified.

show abstract

Performance evaluation of intermittently CFRP wrapped square and circularised square reinforced concrete columns under different loading conditions

Cited by 15 publications

References 48 publications

Effects of Reinforcement Corrosion and Sustained Load on Mechanical Behavior of Reinforced Concrete Columns

Effects of Reinforcement Corrosion and Sustained Load on Mechanical Behavior of Reinforced Concrete Columns

Experimental investigation on the use of glass fiber reinforced polymer reinforcement in hollow‐core circular concrete columns

Fiber-Reinforced Polymer-Confined Non-Circular Columns with Shape Modification: A Comprehensive Review

Contact Info

Product

Resources

About