Prediction of Peeling Failure of Reinforced Concrete Beams With Externally Bonded Steel Plates.

Zhang, S; Raoof, Mohammed; Wood, Laurence

doi:10.1680/istbu.1995.27870

Cited by 54 publications

(28 citation statements)

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“…Based on Zhang et al's model (the first CTM for end cover separation) [26] for RC beams strengthened in flexure with an externally bonded steel plate, De Lorenzis and Nanni [21] proposed a strength model for end cover separation in RC beams strengthened in flexure with NSM FRP round bars. Assuming a linear elastic behaviour, the tensile stress A  at the tension corner near the root of the concrete tooth (Point A in Fig.…”

Section: De Lorenzis and Nanni's Model [21]mentioning

confidence: 99%

Strength model for end cover separation failure in RC beams strengthened with near-surface mounted (NSM) FRP strips

Teng

Zhang

Chen

2016

Engineering Structures

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Abstract:As an alternative to externally bonded FRP reinforcement, near-surface mounted (NSM) FRP reinforcement can be used to effectively improve the flexural performance of RC beams. In such FRP-strengthened RC beams, end cover separation failure is one of the common failure modes. This failure mode involves the detachment of the NSM FRP reinforcement together with the concrete cover along the level of the steel tension reinforcement. This paper presents a new analytical strength model for end cover separation failure in RC beams strengthened in flexure with NSM FRP strips (i.e. rectangular FRP bars with a sectional height-to-thickness ratio not less than 5), which was formulated on the basis of extensive numerical results from a parametric study undertaken using an efficient finite element approach. The proposed strength model consists of an approximate analytical equation for the debonding strain of the FRP reinforcement at the critical cracked section and a conventional section analysis to relate this debonding strain to the moment acting on the same section (i.e. the debonding strain). Once the debonding strain is known, the load level at end cover separation of an FRP-strengthened RC beam can be easily determined for a given load distribution. Predictions from the proposed strength model are compared with those of two existing strength models of the same type and available test results, which shows that the proposed strength model is in close agreement with test results and is far more accurate than the existing strength models.

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Section: De Lorenzis and Nanni's Model [21]mentioning

confidence: 99%

Strength model for end cover separation failure in RC beams strengthened with near-surface mounted (NSM) FRP strips

Teng

Zhang

Chen

2016

Engineering Structures

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“…In fact, many models are a combination of strength of materials and experimental fitting [21,22,23]. Other models are based on fitting experimental data into empirical equations or used data fitting techniques to supplement or correct the strength of materials or fracture mechanics models, as done in the models by Zhang et al [28], Wang and Ling (cited in [5]) and Raoof and Hassanen [25]. The Ziraba model [26] combines the strength model with fracture mechanics approaches.…”

Section: Review Of Models For Debonding Of Frp-strengthened Rc Beamsmentioning

confidence: 99%

“…Zhang et al [28] and Raoof and Zhang [24] developed a strength model for simply-supported RC beams reinforced by steel plates subject to three or four point bending that also could be used for FRP sheets. They base their model on the shear strength of a single concrete "tooth".…”

Section: Raoof and Zhang's Modelmentioning

confidence: 99%

“…In Zhang et al [28], the effective length for end anchorage was taken as the length of the plate in the shear span. Raoof and Zhang [24] assumed that the anchorage length is equal to the smaller value between the length given in [28] and l a , defined as follows:…”

Section: Raoof and Zhang's Modelmentioning

confidence: 99%

“…If the end of the plate does not reach the shear span zone, the effective length should be obtained from Eq. (28).…”

Section: Raoof and Zhang's Modelmentioning

confidence: 99%

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Statistical analysis of existing models for flexural strengthening of concrete bridge beams using FRP sheets

Ceci

Casas

Ghosn

2012

Construction and Building Materials

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This paper performs a statistical analysis of previously proposed models for resisting the debonding of FRP sheets used in strengthening reinforced and prestressed concrete beams. End debonding and intermediate crack-induced debonding modes of failure are studied for beams in flexure. Two different databases are assembled from published experimental debonding tests on concrete beams of different span lengths. The first database contains the results of four point bending tests performed to study the behavior of the FRP-concrete bond at the end of the FRP sheet. The second database which includes four point bending tests, three point bending tests and one point loading tests, has been created to examine intermediate crack-induced debonding. These two databases are significantly larger than those used in developing any of the existing debonding strength models and provide a solid basis for assessing the performance of such models. A regression analysis reviews the relationship between the experimentally measured loads that caused debonding to the model predicted values as well as the bias and the variability in the prediction models. This regression analysis allows for drawing conclusions on the most appropriate and accurate models, from a statistical point of view, that may be used in a follow up reliability-based calibration of partial safety factors. The applicability of such information for the development of design specifications for strengthening of deteriorated concrete bridges is highlighted. This will be implemented in a forthcoming companion paper.

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Fibre composite structures in Australia's civil engineering market: an anatomy of innovation

Erp

Cattell

Heldt

2005

Progress Structural Eng Maths

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During the last 5-10 years there has been considerable activity in research and development of fibre composites in the Australian civil engineering market. Areas of activity have included; bridge systems, replacement of large-section hardwood girders, waterfront structures and railway sleepers. The work has involved not only the initial concept development, but also the construction and deployment of full-scale prototypes. Through close involvement of major asset owners, including state road and rail authorities and city councils, these technologies have evolved from initial technology demonstrators to become viable commercial alternatives to traditional structural solutions. This paper presents a review of these developments and examines the process involved in taking these new systems from a novelty to a viable and credible alternative for local asset owners.

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Prediction of Peeling Failure of Reinforced Concrete Beams With Externally Bonded Steel Plates.

Cited by 54 publications

References 0 publications

Strength model for end cover separation failure in RC beams strengthened with near-surface mounted (NSM) FRP strips

Strength model for end cover separation failure in RC beams strengthened with near-surface mounted (NSM) FRP strips

Statistical analysis of existing models for flexural strengthening of concrete bridge beams using FRP sheets

Fibre composite structures in Australia's civil engineering market: an anatomy of innovation

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