Local stress field approach for post cracking analysis of FRP strengthened RC elements

Ghiassi, Bahman; Soltani, Mohammad Reza; Pourkeramat, P.

doi:10.1016/j.compositesb.2013.02.032

Cited by 1 publication

(9 citation statements)

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“…Reinforcing bars, FRP sheets and concrete bridging stress carry the local stresses at the crack plane [24,25]. The interlocking between the crack surfaces results in transmission of some residual tensile stresses along the cracked planes.…”

Section: Mechanics Of Cracked Frp-strengthened Rc Tensile Membersmentioning

confidence: 99%

“…The cracks are perpendicular to the element axis and therefore the concrete contribution is only 10 limited to the bridging stresses at the crack plane. Investigating the effect of shear stresses at the crack plane in FRP-strengthened RC elements has been presented and discussed elsewhere, see [25]. Considering a unidirectional RC element, the contribution of reinforcing bars can be expressed as…”

Section: Computational Proceduresmentioning

confidence: 99%

“…The equilibrium of the local and average stresses in RC domain gives: 13) where and are the steel and the FRP local stresses at crack plane, respectively. Based on the compatibility relationships, the strains in the longitudinal direction (x-y coordinate system) can be expressed [25,52].…”

Section: Computational Proceduresmentioning

confidence: 99%

“…Reinforcing bars, FRP sheets, and concrete bridging stress carry the local stresses at the crack plane. 24,25 The interlocking between the crack surfaces results in transmission of some residual tensile stresses along the cracked planes. On the other hand, the stresses developed in reinforcing bars and FRP sheets are partly transferred to the concrete between adjacent cracks owing to the bond stresses at reinforcing bars–concrete and FRP–concrete interfaces, see Figure 2.…”

Section: Mechanics Of Cracked Frp-strengthened Rc Tensile Membersmentioning

confidence: 99%

“…Investigating the effect of shear stresses at the crack plane in FRP-strengthened RC elements has been presented and discussed in the literature. 25 Considering a unidirectional RC element, the contribution of reinforcing bars can be expressed as σ∼Sx=ρsxσ¯sx where, ρsx is the longitudinal reinforcement ratio and σ¯sx is the spatial average stress of reinforcement along its axis. Similarly, the contribution of FRP can be expressed as σ∼FRPx=ρFxσ¯Fx where, ρFx is the longitudinal reinforcement ratio and σ¯Fx is the spatial average stress of FRP along its axis.…”

Section: Computational Proceduresmentioning

confidence: 99%

See 4 more Smart Citations

Micromechanical modeling of tension stiffening in FRP-strengthened concrete elements

Ghiassi

Soltani

Sepehr

2018

Journal of Composite Materials

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This paper presents a micro-modeling computational framework for simulating the tensile response and tension stiffening behavior of FRP-strengthened RC elements. The total response of strengthened elements is computed based on the local stress transfer mechanisms at the crack plane including concrete bridging stress, reinforcing bars stress, FRP stress and the bond stresses at the bars-to-concrete and FRP-to-concrete interfaces. The developed model provides the possibility of calculating the average response of FRP, reinforcing bars and concrete as well as the crack spacing and crack widths. The model, after validation with experimental results, is used for a systematic parameter study and development of micromechanics-based relations for calculating the crack spacing, FRP critical ratio, debonding strength and effective bond length. Constitutive models are also proposed for concrete tension stiffening and average response of steel reinforcing bars in FRPstrengthened members as the main inputs of smeared crack modeling approaches.

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Section: Mechanics Of Cracked Frp-strengthened Rc Tensile Membersmentioning

confidence: 99%

Section: Computational Proceduresmentioning

confidence: 99%