Fatigue Behavior of Externally Strengthened Concrete Beams with Fiber-Reinforced Polymers: State of the Art

Kim, Yail J.; Heffernan, P. J.

doi:10.1061/(asce)1090-0268(2008)12:3(246)

Cited by 127 publications

(43 citation statements)

References 25 publications

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“…A number of studies have been conducted on the unloading and cyclic bond-slip behaviour of FRP-to-concrete bonded joints [26][27][28][29]. It has been observed in these studies that: 1) when the interface has entered the softening range, the bond stress reduces as the interfacial slip decreases due to unloading; 2) the unloading stiffness decreases rapidly with the increase of interfacial slip at unloading; and 3) in the softening range, the unloading stiffness is generally smaller than the initial loading stiffness.…”

Section: Damaged Local Bond-slip Modelmentioning

confidence: 99%

Behaviour of FRP-to-concrete interfaces between two adjacent cracks: A numerical investigation on the effect of bondline damage

Chen

Teng

2012

Construction and Building Materials

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Abstract:The bond behaviour between FRP and concrete has been commonly studied using simple pull-off tests on bonded joints where an FRP plate bonded to a concrete prism is pulled at one end to induce debonding failure. Knowledge gained from such studies has been directly employed in predicting debonding failure in FRP-plated concrete beams induced by major flexural cracks, but significant differences exist between the two scenarios. The chief difference lies in the interaction between adjacent flexural cracks in a flexural member which is absent in a joint pull-off test. This interaction may be approximated using an FRP-to-concrete bonded joint where the FRP plate is pulled at both ends. This paper presents a numerical study into this bonded joint problem, with the main objective being to clarify the effect of bondline damage during slip reversals on the ultimate load. The study shows that such damage has a significant effect on the predicted bond behaviour and ultimate load when the ratio between the end loads is larger than 0.7, particularly when the bond length is reasonably large. An important implication of the present study is that in the modelling (e.g. finite element modelling) of debonding behaviour of FRP-plated RC beams where multiple cracks exist, the FRP-to-concrete interface should be represented using a bond-slip model with appropriate consideration of the damaged behaviour during slip reversals in order to achieve accurate predictions.

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Section: Damaged Local Bond-slip Modelmentioning

confidence: 99%

Behaviour of FRP-to-concrete interfaces between two adjacent cracks: A numerical investigation on the effect of bondline damage

Chen

Teng

2012

Construction and Building Materials

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“…However, some other factors involved in the design for safety bonding, such as adhesion or bonding property, fabrication, economy, are involved in the materials selection. Although increasing the strength was not the main purpose of this study, analogous to the study of Wu and Sun [26], Bank and Arora [27], and Kim and Hefferman [28] it was proven that this externally bonding of the concrete elements can improve some other mechanical properties such as strength.…”

Section: Discussionmentioning

confidence: 56%

A design for de-fragmentation of concrete materials to decline the vulnerability in the reconstruction of houses

Shahnoori

Voorbij

2009

WIT Transactions on the Built Environment

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In an integrated building system optimization of the sub-systems and the segments is a key issue. Improving the structural elements and materials for a reconstruction after an earthquake is even more important than a normal construction. Because earthquakes annually cause big economic and human impacts on world's society such as losses of energy (causing depletion of natural resources in a large scale), efforts, and lives. With building destruction in seismic areas, the collapse of construction materials and their weight is the main reason for fatalities and severe injuries. Houses as the major inhabited buildings are the main subject of the collapse or damages in earthquakes. Thus, to guarantee the sustainability by an integrated design and a qualitative building system, appropriately materialization of houses is highly important in seismic areas. As the context of this study is a seismic desert city, it concentrates on increasing the efficiency of the building system in such an area. The main goal is declining the vulnerability of the inhabitants of a house by appropriately materialisation and designing for de-fragmentation.

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“…Thus, it is possible to calculate the flexural strength of reinforced concrete structures according to the limit crack depth calculated by equation (7). The tensile reinforcement stress will reach yield strength at elements failure stage, but FRP stress will not reach its ultimate stress.…”

Section: Flexural Strength Of Rc Membersmentioning

confidence: 99%

Load-bearing capacity of flexural reinforced concrete members strengthened with fiber-reinforced polymer in fracture stage

Šlaitas

Valivonis

Juknevičius

et al. 2018

Advances in Mechanical Engineering

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The article examines the behavior of flexural reinforced concrete members, strengthened with fiber-reinforced polymers (FRP), under the ultimate loading conditions (in fracture stage). One of the main problems of such elements is sudden and brittle failure mode caused by FRP debonding. The method for the calculation of load-bearing capacity of the normal section of flexural reinforced concrete members, strengthened with various types of FRP, is proposed in this article. This method is based on the theory of fracture mechanics of solids. The reduction of overall member stiffness due to the slip between concrete and FRP is estimated by reducing the FRP stress according to the built-up bars theory. Such reduction allows the prediction of load-bearing capacity of strengthened members sufficiently precisely even for sudden and brittle FRP debonding failure mode. The numerical results are compared with experimental ones. In total, 55 reinforced concrete beams, strengthened with externally bonded or near surface mounted carbon fiber-reinforced polymer and glass fiber-reinforced polymer sheets, plates, strips, and rods, are analyzed in this comparison. Experimental results were collected from various scientific publications. A focus is made on the depth of the crack in critical normal section and FRP strain-stress relationship.

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Fatigue Behavior of Externally Strengthened Concrete Beams with Fiber-Reinforced Polymers: State of the Art

Cited by 127 publications

References 25 publications

Behaviour of FRP-to-concrete interfaces between two adjacent cracks: A numerical investigation on the effect of bondline damage

Behaviour of FRP-to-concrete interfaces between two adjacent cracks: A numerical investigation on the effect of bondline damage

A design for de-fragmentation of concrete materials to decline the vulnerability in the reconstruction of houses

Load-bearing capacity of flexural reinforced concrete members strengthened with fiber-reinforced polymer in fracture stage

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