Behavior of externally prestressed continuous beams with FRP/steel rebars under symmetrical/unsymmetrical loading: Numerical study

Lou, Tiejiong; Li, Zhangxiang; Pang, Min

doi:10.1016/j.cscm.2022.e01196

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…The relatively large specimen size used in the present work helped minimize possible experimental error related to materials variability. Hence, we believe that the differences in the mechanical properties among the present beams re ected mainly the impact of heating, repair regime and loading protocol [24][25][26][27][28][29][30][31][32][33][34].…”

Section: Objectives and Scopementioning

confidence: 99%

“…A few researchers tackled the impact of load symmetry on the performance of FRP-strengthened RC beams [30][31][32][33][34]. Razaqpur et al [31] examined the effect of the asymmetrical loading on FRP shearstrengthened beams with different shear span-to-depth ratios.…”

Section: Introductionmentioning

confidence: 99%

“…The researchers concluded that the FE models that they developed provided reliable insights into the shear behavior of CFRP-reinforced concrete beams under asymmetrical loading conditions. Finally, Tiejiong et al [34] explored potential alternatives to address the issue of corrosion by replacing steel bars with FRP bars in externally pre-stressed concrete continuous beams exposed to different loading regimes. Compared to symmetric-loading conditions, asymmetricloading conditions caused higher mid-span de ection, but lower tendon stress.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Loading Protocol on the Repair Efficiency of Heat-damaged Concrete Beams with SNSM CFRP Ropes

Haddad,

Obeidat

2024

Preprint

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The influence of static-load distribution and symmetry on the flexural performance of concrete beams, strengthened/repaired using side near-surface-mounted (SNSM) CFRP ropes with parabolic and straight profiles is investigated. For this, eighteen reinforced concrete beams (150 × 250 × 1600 mm) were fabricated using a ready-mix concrete of 35 MPa strength grade before cured for 28 days in wet burlap for 28 days. Nine beams were exposed to an elevated temperature at 450oC for three hours, while the remaining ones were left in laboratory air, as controls. Six specimens from each group were retrofitted using SNSM of straight and parabolic profiles then tested with references ones under four- and six-point symmetrical and six-point asymmetrical loadings with load response versus deflection and strain in SNSM ropes acquired. Furthermore, cracking initiation and propagation leading to failure was monitored and reported. Generally, the study revealed that the mechanical performance of the concrete beams was influenced by the loading regime as well as by the rope profile (straight, parabolic) as well as heat-damage. The flexural performance factor (PF) varied from 5.4 to 7.9 for strengthened compared to 10.9 to 16.3 for repaired and heat-damaged specimens. Furthermore, all strengthened/repaired beams failed by concrete-cover separation following the sudden rupture of the SNSM CFRP ropes except for that repaired with a straight profile of SNSM CFRP rope and subjected to asymmetrical loading.

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Section: Objectives and Scopementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Loading Protocol on the Repair Efficiency of Heat-damaged Concrete Beams with SNSM CFRP Ropes

Haddad,

Obeidat

2024

Preprint

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“…In externally post-tensioned members, the ultimate tendon stress, σ pu , depends on the whole member deformation, and therefore, its accurate predictions are complicated. The calculation of σ pu is essential for the flexural strength design of externally prestressed members [ 27 , 28 , 29 , 30 , 31 , 32 ]. The stress σ pu is commonly expressed by

where Δ σ p is the ultimate stress increment and σ pe is the effective prestress.…”

Section: Analytical Studymentioning

confidence: 99%

Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams

Lou

Pang

2023

Materials

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This work assesses the flexural performance of prestressed concrete beams with external carbon fiber-reinforced polymer (CFRP) tendons, focusing on tendon-related variables. A finite element analysis (FEA) method is verified. A numerical parametric analysis of prestressed concrete beams with external CFRP tendons is carried out. Four tendon-related variables are considered, namely, the area, initial prestress, depth and elastic modulus of tendons. The analysis shows that flexural ductility decreases as the tendon area, initial prestress or elastic modulus increases but is insensitive to the tendon depth. The ultimate tendon stress increment (Δσp) is influenced by all of the four variables investigated. JGJ 92-2016 (Chinese technical specification for concrete structures prestressed with unbonded tendons) significantly underestimates Δσp and, hence, is over-conservative for the strength design of these beams. An equation is proposed for calculating Δσp, taking into account all four variables investigated. An analytical model is then developed to estimate the flexural strength (Mu) of prestressed concrete beams with external CFRP tendons. The proposed analytical model shows good agreement with FEA, i.e., the mean discrepancy for Δσp is 0.9% with a standard deviation of 11.1%; and the mean discrepancy for Mu is −1.6% with a standard deviation of 2.1%.

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“…In this context, axially restricted RC beams can be considered as a particular case of RC beams with external tendons (i.e., zero initial prestress). The behavior of the latter beams has been extensively addressed [ 15 , 16 , 17 , 18 ]. Fiber reinforced polymer (FRP) composites are recognized as a promising alternative to steel reinforcement in reinforced [ 19 , 20 , 21 , 22 ] and prestressed concrete applications [ 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Flexural Response of Axially Restricted RC Beams: Numerical and Theoretical Study

Lopes

et al. 2022

Materials

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Reinforced concrete (RC) frame beams are subject to axial restriction at the ends, which plays an important role in the nonlinear behavior of these beams. This paper presents a numerical and theoretical investigation into the flexural behavior of RC beams axially restricted with external steel or fiber reinforced polymer (FRP) reinforcement. A numerical procedure for RC beams axially restricted with external reinforcement has been developed and it is verified against available experimental results. A numerical parametric study is then performed on axially restricted RC beams, focusing on the effect of type, area, and depth of external reinforcement. The results show that axial restriction increases the post-cracking stiffness and ultimate load-carrying capacity but reduces the flexural ductility. The ultimate stress in external reinforcement is substantially impacted by reinforcement type, area, and depth. A simplified model is developed to predict the ultimate load of RC beams axially restricted with external steel/FRP reinforcement. The predictions of the proposed simplified model agree favorably with the numerical results. The correlation coefficient for the ultimate load is 0.984, and the mean difference is −2.11% with a standard deviation of 3.62%.

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Behavior of externally prestressed continuous beams with FRP/steel rebars under symmetrical/unsymmetrical loading: Numerical study

Cited by 5 publications

References 19 publications

Impact of Loading Protocol on the Repair Efficiency of Heat-damaged Concrete Beams with SNSM CFRP Ropes

Impact of Loading Protocol on the Repair Efficiency of Heat-damaged Concrete Beams with SNSM CFRP Ropes

Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams

Flexural Response of Axially Restricted RC Beams: Numerical and Theoretical Study

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