Effect of eccentric load on retrofitted reinforced concrete columns confined with FRP

Pham, Thanh-Hang; Xu, Lei; Hadi, Muhammad N. S

doi:10.1201/b15320-24

Cited by 5 publications

(8 citation statements)

References 9 publications

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“…The calculated peak loads were close to the experimental peak loads but on the un-conservative side (calculated load higher than experimental load). Pham et al (2013) reported a reduction in the confinement effect by 40% when the eccentricity was increased from zero to 25 mm ( ⁄ of the specimen's thickness). Due to the lack of data of PVC encased walls, the confinement effect of the PVC was approximately estimated to increase the axial load capacity by 10% at all eccentricities.…”

Section: Comparison Between the Experimental And Calculated Resultsmentioning

confidence: 99%

“…They reported that this particular configuration increased the axial load capacity (confinement effect of the PVC system) by 23% to 25% over the control specimens. On the other hand, for eccentrically loaded columns, Pham et al (2013) reported that the confinement effect decreased as the eccentricity increased for reinforced concrete columns wrapped with fiber reinforced polymer (FRP) sheets. The FRP wraps increased the axial capacity for the concentrically loaded columns by 200 to 400%…”

Section: Comparison Between the Experimental And Calculated Resultsmentioning

confidence: 99%

“…In the current study, the load was applied at different eccentricities. It is expected that the confinement effect decreases as the eccentricity increases (Pham et al 2013). …”

Section: Comparison Between the Experimental And Calculated Resultsmentioning

confidence: 99%

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Behaviour of PVC encased reinforced concrete walls under eccentric axial loading

et al. 2016

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Stay-in-place (SIP) formwork has been used as an alternative to the conventional formwork system. The systems are mainly assembled on site, hence simplifying the construction process and reducing the construction time as the removal procedure has been eliminated. SIP formwork systems can be divided into two main categories; structural and non-structural formwork, based on their contribution to resist applied loads.The structural formwork provides the same advantages as the non-structural formwork, in addition to its contribution to resist the applied loads. As a result, the cross section and the reinforcement of the structural member can be reduced. Recently, polyvinyl chloride (PVC) has been used as a stay-in-place formwork because of its lower cost compared to other materials, durability, and ease to assemble.The PVC SIP formwork consists of interconnected elements; panels and connectors that serve as permanent formwork for the concrete walls. In this study, the behaviour of the PVC encased reinforced concrete walls under eccentric compression loading was investigated. The variables in this study were the type of the specimen (PVC encased or control), the longitudinal reinforcement (4-10M or 4-15M rebars) and the eccentricity of the applied compression load (33.87 mm, 67.73 mm and 101.6 mm). Generally, the control walls (without PVC encasement) failed by yielding of the steel followed by crushing of the concrete, or by crushing of the concrete without yielding of the steel. For the PVC encased walls, buckling of the PVC occurred after the concrete crushed. The PVC encased specimens showed a higher peak load than their peer control walls. The effect of the PVC on increasing the ultimate capacity at a given eccentricity was more significant for the walls reinforced with 4-10M than the walls reinforced with 4-15M. For the lowest reinforcement ratio (4-10M), the PVC encased specimens showed an increase iv in peak load by 37.2% and 17.1% at an eccentricity of 67.73 mm and 101.6 mm, respectively. When the reinforcement was increased to 4-15 M, the increase in the peak load dropped at all eccentricities to 10%. For the vertical and the mid-span deflection, the PVC encased specimens and the control specimens showed the same values. Also, the test results showed an increase in the energy absorption capacity for the PVC encased specimens compared to the controls specimens, where the effect for the walls reinforced with 4-10M was higher than the walls reinforced with 4-15M at a given eccentricity.An analytical model was developed to predict the ultimate load capacity of the specimens taking into consideration the effect of the PVC on the load carrying capacity of the walls.The provision was derived based on the moment magnification factor method in which the effect of secondary stresses associated with the column deformations was taken into consideration. The calculated capacities of the PVC encased specimens showed a conservative error of 5.9% on average.v

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Section: Comparison Between the Experimental And Calculated Resultsmentioning

confidence: 99%

Section: Comparison Between the Experimental And Calculated Resultsmentioning

confidence: 99%

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Behaviour of PVC encased reinforced concrete walls under eccentric axial loading

et al. 2016

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“…However, there are only a few publications that analyze nonlinear strain of plates with due regard to the combined effect of initial deflection, physical and geometric nonlinearity and temperature-dependent changes in mechanical properties [3,4,11]. Therefore, this issue needs to be further studied.…”

Section: Introductionmentioning

confidence: 99%

“…A. G. Tamrazyan and A. S. Kozhanova [4] demonstrated high-temperature effects on thermal creep of shallow reinforced concrete shells and flat plates. Pham T. M., et al [11] investigated the influence of eccentric loading on the load-bearing capacity of reinforced concrete columns. Zhang Y. and Karr D. G. [12] developed analytical models to design plates under quasi-static pressure.…”

Section: Introductionmentioning

confidence: 99%

Temperature influence on strain state of a flexible plate

et al. 2018

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Abstract. Developing analytical methods for studying the strain state of flexible plates is a relevant issue, especially for complex problems that recognize nonlinear operation and temperature-dependent changes in mechanical properties of materials. The paper analyzes the stress-strain state of a two-field flexible plate with an initial deflection exposed to a non-uniform temperature field. It presents and analyzes the results of the numerical studies based on an algorithm developed by the authors for designing anisotropic rectangular structural elements with discontinuous parameters, taking into account nonlinearities. The analysis of the design results suggests that initial deflection, physical and geometric nonlinearities, as well as inhomogeneity of the plate material need to be taken into consideration.

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Compressive behaviour of concrete elements confined with GFRP-prefabricated bonded shells

Beddiar

Zitoune

Collombet

et al. 2014

European Journal of Environmental and Civil Engineering

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In this paper, a new technique is proposed to confine concrete columns using GFRPprefabricated bonded shells and a shrinkage-compensating cement mortar. The confinement is performed with three identical shells, each of which contains two stepped lap joints at their ends. The main advantage of this technique is that the shells can be directly assembled on site by structural bonding to cover any column shape. The gap between the shells and the column is filled with shrinkage-compensating cement mortar. To evaluate the efficiency of this technique, several concrete specimens were confined, instrumented and tested under monotonic compression. To simulate the actual strengthening conditions, the load was directly applied on the concrete crosssection. The results show clearly the benefits of an efficient confinement in terms of a noticeable increase in the axial strength and ductility where the stress-strain curves are characterised by a third softening phase and the failure mode which spread over the whole length of the shells.

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Effect of eccentric load on retrofitted reinforced concrete columns confined with FRP

Cited by 5 publications

References 9 publications

Behaviour of PVC encased reinforced concrete walls under eccentric axial loading

Behaviour of PVC encased reinforced concrete walls under eccentric axial loading

Temperature influence on strain state of a flexible plate

Compressive behaviour of concrete elements confined with GFRP-prefabricated bonded shells

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