| 1. |
- Lundgren, Karin, 1968, et al.
(författare)
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Analytical model for the bond-slip behaviour of corroded ribbed reinforcement
- 2012
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Ingår i: Structure and Infrastructure Engineering. - : Informa UK Limited. - 1573-2479 .- 1744-8980. ; 8:2, s. 157-169
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Tidskriftsartikel (refereegranskat)abstract
- Corrosion of reinforcement affects the bond mechanism between reinforcement and concrete, and thus the anchorage. Reliable models describing this are needed especially for assessment of the load-carrying capacity of existing structures. This paper presents an analytical one-dimensional model for bond-slip response of corroded reinforcement. The proposed model is an extension of the bond-slip model given in the CEB-FIP Model Code 1990, and is practically applicable for structural analyses to determine the load-carrying capacity of corroded structures. Furthermore, the anchorage length needed to anchor the yield force is calculated from the bond slip, using the one-dimensional bond-slip differential equation. Results of the proposed model are compared to experimental results as well as results from an advanced three-dimensional finite element model. The suggested model is shown to give results that are consistent with the physical behavior.
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| 2. |
- Zandi, Kamyab, 1981, et al.
(författare)
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Analysis of Mechanical Behavior of Corroded Reinforced Concrete Structures
- 2011
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Ingår i: ACI Structural Journal. - 0889-3241. ; 108:5, s. 532-541
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a methodology to analyze the mechanical behavior and remaining load-carrying capacity of corroded reinforced concrete (RC) structures. The methodology is used to predict the mechanical behavior for a structure with an observed amount of uniform and pitting corrosion at a given time. The effect of corrosion is modeled as a change in geometry and properties of corroded reinforcement and surrounding concrete—that is, a reduction of steel area and ductility, removal of spalled concrete, modification of concrete response due to corrosion cracks, and modification of bond-slip properties. The methodology is applied to concrete beams affected by reinforcement corrosion, using both finite element analyses and analytical methods. A comparison of the results with available experiments from the literature indicated that the changes in failure mode and failure load caused by uniform and pitting corrosion of reinforcement can be predicted reasonably well by using the proposed methodology.
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| 3. |
- Zandi, Kamyab, 1981, et al.
(författare)
-
Modelling the structural behaviour of frost-damaged reinforced concrete structures
- 2013
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Ingår i: Structure and Infrastructure Engineering. - : Informa UK Limited. - 1573-2479 .- 1744-8980. ; 9:5, s. 416-431
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Tidskriftsartikel (refereegranskat)abstract
- A methodology is introduced to predict the mechanical behavior of reinforced concrete structures with an observed amount of frost damage at a given time. It is proposed that the effects of internal frost damage and surface scaling can be modeled as changes of material and bond properties, and geometry, respectively. These effects were studied and suggestions were made to relate the compressive strength and dynamic modulus of elasticity, as the indicators of damage, to the response of the damaged concrete in compression and tension, and to the bond behavior. The methodology was applied to concrete beams affected by internal frost damage, using non-linear finite element analyses. A comparison of the results with available experimental data indicated that the changes in failure mode and, to a rather large extent, the effect on failure load caused by internal frost damage can be predicted. However, an uncertainty was the extension and distribution of the damaged region which affected the prediction of the load capacity.
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