Numerical investigation of reinforced-concrete beams with half-joints

Abdel-Moniem, A.; Madkour, H.; Abdullah, Ahmad; Farah, Khalid

doi:10.1680/jstbu.17.00197

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…The term μ crit represents the critical value of the section loss that cause rebar fracture in the elastic stage (i.e., before yielding), and is calculated as given in Equation (19). Equation (20) provides the value of the parameter P to be used in Equation (18).…”

Section: Reinforcing Steelmentioning

confidence: 99%

“…In general, the proposed NLFE models are used to perform parametric studies after validation with experimental tests. For example, in References 18–20, the dependence of the dapped‐end behavior on the geometry of the nib and the concrete strength was investigated, while in References 21–25 the effects of the amount and position of the main reinforcement and the stirrups were analyzed. In the scientific literature NLFE analyses are used to predict the capacity of dapped‐ends under monotonic, 26,27 or dynamic loading 28,29 .…”

Section: Introductionmentioning

confidence: 99%

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Capacity assessment of uncorroded and corroded dapped‐end beams by NLFE and strut‐and‐tie based methods

Belletti,

Calcavecchia,

Ferretti

et al. 2024

Structural Concrete

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The verification of dapped‐end beams degraded by corrosion is a problem, especially for existing bridges in service. This paper proposes a nonlinear finite element (NLFE) modeling procedure and a simple strut‐and‐tie based procedure for predicting the response of dapped‐end beams subjected to chloride corrosion. Firstly, the finite element modeling strategy, based on the adoption of multilayer shell elements and the PARC_CL 2.1 crack model is described. Then, the degradation effects on concrete, rebars, and steel‐to‐concrete interaction are defined as a function of the propagation period of corrosion. In particular, the effects of corrosion on the reinforcement are modeled by applying a reduction of tensile strength that considers for both the reduction of cross‐section and the ultimate strain caused by pitting. Concrete splitting cracking due to volume expansion during rust formation is modeled by reducing the mechanical properties of concrete. Corrosion effects in steel‐to‐concrete interaction are modeled by applying a bond strength decay to the spring elements connecting corroded rebars—modeled with truss elements—and concrete multilayer shell elements. The proposed finite element procedure is used to study two scenarios based on different spatial distributions of corrosion‐prone areas. Subsequently, a simplified analytical approach based on the strut‐and‐corroded tie method—called S&CT method—is proposed and compared with the finite element outcomes. Finally, the validations of the two proposed methods are presented with respect to a corroded dapped‐end beam, showing that corrosion of rebars affects the resistance mechanisms of the dapped‐end beam, by reducing both resistance and ductility. The proposed simplified analytical S&CT method provides conservative and safe results compared to the numerical NLFE model and to experimental data.

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Section: Reinforcing Steelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capacity assessment of uncorroded and corroded dapped‐end beams by NLFE and strut‐and‐tie based methods

Belletti,

Calcavecchia,

Ferretti

et al. 2024

Structural Concrete

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“…• Fiber Reinforced Polymers (FRP) or Carbon Fiber Reinforced Polymers (CFRP) strengthening systems [12,13,[24][25][26][27][28];…”

Section: State Of the Artmentioning

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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Editorial

Palmeri

2020

Proceedings of the Institution of Civil Engineers - Structures

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Numerical investigation of reinforced-concrete beams with half-joints

Cited by 4 publications

References 12 publications

Capacity assessment of uncorroded and corroded dapped‐end beams by NLFE and strut‐and‐tie based methods

Capacity assessment of uncorroded and corroded dapped‐end beams by NLFE and strut‐and‐tie based methods

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

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