Durability enhancement of half-joints in RC bridges through external prestressed tendons: The Musmeci Bridge’s case study

Santarsiero, Giuseppe; Picciano, Valentina

doi:10.1016/j.cscm.2022.e01813

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…Figure 5b demonstrates that, for the same deflection, a high tendon area causes a small increase in tendon stress. The slopes of the stress-deflection relationship for beams with A p = 200, 650, 1100, 1550 and 2000 mm 2…”

Section: Effect Of Tendon Areamentioning

confidence: 99%

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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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Section: Effect Of Tendon Areamentioning

confidence: 99%

“…External prestressing is a powerful technique for structural rehabilitation and construction [ 1 , 2 ]. The major concern for this technique is the corrosive damage of external tendons made of conventional prestressing steel.…”

Section: Introductionmentioning

confidence: 99%

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

Lou

Pang

2023

Materials

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“…External prestressing systems are used as a common strengthening procedure for half-joints [10,11]. This procedure necessitates the perforation of the top slab to execute the strengthening work; hence, a prolonged closure of the structure to traffic.…”

Section: Introductionmentioning

confidence: 99%

“…The proposed system is applicable, in the present version, only to bridge decks where there is no transverse beam connecting the half joints or where this beam is placed behind the joint. External prestressing systems are used as a common strengthening procedure for half-joints [10,11]. This procedure necessitates the perforation of the top slab to execute the strengthening work; hence, a prolonged closure of the structure to traffic.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Investigation on Steel Jacketing Retrofitting of Concrete Bridges Half-Joints

et al. 2023

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An innovative strengthening system for dapped-end beams is studied numerically and experimentally in this paper. The system is developed for the half-joint regions of bridge beams also commonly called “gerber saddles”, but it can be adapted to different scenarios. The strengthening system consists of two steel plates that are clamped on both sides of the webs of the beams by means of bolts. The purpose of the system is to transfer the highest possible amount of shear from the concrete webs to the steel plate elements reducing the resistance demand of the concrete half joint. Shear is transferred by friction from concrete to steel plates. The system is designed to be applied on existing bridges without heavy work interesting the carriageway, therefore reducing the interference with the traffic. Some interesting considerations emerge from the study, including the influence of the flange web connection on the structural behavior and the possible presence of brittle failure mechanisms that are difficult to model numerically using f.e.m. simulations.

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Post‐tension retrofitting of RC dapped‐end beams: A numerical investigation

Santarsiero,

Picciano

2024

Structural Concrete

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Dapped‐end beams are frequently used in roofing and flooring systems of precast reinforced concrete buildings as well as in bridge constructions. Due to design flaws, deterioration, and construction mistakes, they may have unsatisfactory structural performance. Past experimental studies investigated the effectiveness of post‐tension strengthening techniques applied to dapped‐end beams, revealing them as effective solutions, even though a limited range of influencing parameters were considered. This paper numerically investigates the performance improvement provided by post‐tension interventions applied to dapped‐end beams. Numerical models were built through a refined FEM software simulating two experimental tests found in the literature. After the models' calibration, a post‐tension intervention was designed and implemented in the models, considering the level of prestressing as the main intervention's parameter. Afterwards, the behavior in the post‐intervention condition was analyzed to find changes in the failure modes and highlight the performance improvement concerning cracking phenomena and ultimate load‐bearing capacity. It is found that the level of tendons' prestress significantly improves the cracking load, which increases almost linearly with respect to it. Conversely, the significant gain in terms of ultimate load‐bearing capacity (up to 53%) shows only slight variations when the prestress level changes. Finally, accounting also for the reduction of deformation capacity for high prestressing levels, practical suggestions are provided regarding the optimal post‐tension choice.

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Durability enhancement of half-joints in RC bridges through external prestressed tendons: The Musmeci Bridge’s case study

Cited by 4 publications

References 27 publications

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

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

Preliminary Investigation on Steel Jacketing Retrofitting of Concrete Bridges Half-Joints

Post‐tension retrofitting of RC dapped‐end beams: A numerical investigation

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