Plasticity modeling of FRP-confined circular reinforced concrete columns subjected to eccentric axial loading

Kabir, Mohammad Zaman; Shafei, Erfan

doi:10.1016/j.compositesb.2011.11.075

Cited by 35 publications

(8 citation statements)

References 17 publications

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“…The mechanical parameters of such support are not stable, therefore. The analyzes of eccentrically loaded elements have been carried out mainly in relation to reinforced concrete elements [2], steel columns [3] and masonry structures [4,5]. Respectively, the results of the experimental research concerns mainly GFRP Reinforced Geopolymer Concrete [6], steel [3] and masonry structures [7,8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effect of load application eccentricity on the stiffness of supports consisting of stack of elements

Gromysz

2019

MATEC Web Conf.

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During the removal of building deflections, temporary supports, consisting of a stack of repeatable elements, are used. Hydraulic jacks which force the vertical displacement of the building are used, as well. Depending on the phase of deflection removal, the entire weight of the building, or part thereof, is rested on temporary supports. As a consequence of inaccuracies in the installation of a stack of elements, the building weight is transmitted onto supports in an eccentric manner. In addition, the supports are loaded with horizontal forces. The forces result from the wind load, from kinematic excitations of non-axially installed jacks, from 2nd order deformations of supports and from exceptional loads. Deformations in the vertical direction, with a positive sign, occur due to the activity of the eccentric load and horizontal forces in the supports. However, the unbounded hexagonal elements forming the stack are unable to transmit the tensile stresses. As a consequence, the stiffness of the supports depends on the load. The stiffness of temporary supports in the horizontal direction was analysed considering the existence of unintended eccentricity and the horizontal load. A support model was defined for this purpose, whose material does not transmit tensile stresses. It was shown that the scheme of the support is changing depending on the application eccentricity of the vertical load and on the horizontal load value. Eight schemes were distinguished, which may be executed by a support. It was found that if the eccentricity and the horizontal load value are increased, this will decrease the support stiffness. This stiffness varies from zero, when a rocker arm is the support scheme, to the maximum value that is corresponding to the stiffness of cantilever rod. The analysis is limited to stocky supports by assuming that the load is much smaller than critical. Moreover, the influence of the support’s vertex displacement on the eccentricity was not taken into account.

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Section: Introductionmentioning

confidence: 99%

Analysis of the effect of load application eccentricity on the stiffness of supports consisting of stack of elements

Gromysz

2019

MATEC Web Conf.

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“…Subject to investigations up till now have been only the parameters of a stack of wooden elements used for elimination of defl ections of low structures, with up to three stories (Gromysz, 2018). Moreover, the analyses of axially and eccentrically loaded elements have been carried out mainly in relation to reinforced concrete elements (Kabir & Shafei, 2012), steel columns (Nie, Kang, Shen & Yang, 2017) and masonry structures (Bernat--Maso, Gil & Roca, 2015;Moradabadi, Laefer, Clarke & Lourenço, 2015). Respectively, the results of the experimental research concerns mainly glass fi bre reinforced polymer-reinforced geopolymer concrete -GFRP-RGC (Elchalakani, Karrech, Dong, Ali & Yang, 2018), steel (Nie et al, 2017), masonry structures (Cavaleri, Failla, Mendola & Papia, 2005;Bernat-Maso, Gil & Escrig, 2015) and composite multi-drum columns (Buzov, Radnić, Grgić & Baloević, 2018).…”

Section: Introductionmentioning

confidence: 99%

Examination of stiffness of stack of steel elements forming part of supports used for removal of building deflections

Gromysz

Smolana

2019

srees

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The removal of building deflections consists of uneven raising of buildings with piston hydraulic jacks. A stack of parallelepiped steel elements is situated under jacks during defl ection removal for technological reasons. The stack has decisive influence on the stiffness of the supports. Tests of the stack of parallelepiped elements loaded with increasing and decreasing force were designed and carried out. Three characteristic phases were identified based on the tests. The maximum stiffness in particular phases was, respectively 13.1, 63.1 and 10.1% of theoretical stiffness.

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“…It has been concluded that eccentrically loaded columns exhibit different mechanical behavior in accordance with different eccentricities. Therefore, the constitutive models for FRP-confined concrete under concentric loading cannot be directly applied and thus new constitutive models have been proposed and verified [18,19]. Cai et al investigated the circular concrete-filled steel tube columns under eccentric loading; it was found that the steel tube provided nonuniform confinement stress to inner concrete under eccentric loading [20].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Concrete‐Filled Square Steel Tube Short Columns under Eccentric Loading

Shan

Cai

et al. 2019

Mathematical Problems in Engineering

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The concrete-filled square steel tube (CFSST) columns have been widely applied in structural engineering. Although many constitutive models have been proposed to describe CFSST short columns under concentric loading, the applicability of the existing concentric model in the analysis of CFSST short columns under eccentric loading has not been properly verified. In this paper, the eccentric behaviors of CFSST short columns were investigated with the software of ABAQUS/standard. It was found that the contact stress between steel tube and inner concrete was seriously affected by eccentric ratios, indicating that the confinement effect of steel tube on inner concrete was different under concentric and eccentric loading. In this paper, a new stress-strain model of inner concrete which considered the influence of eccentricity was developed and verified with existing experimental results. It was found that the proposed stress-strain model was more accurate in simulating the eccentric behaviors of CFSST short columns.

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Plasticity modeling of FRP-confined circular reinforced concrete columns subjected to eccentric axial loading

Cited by 35 publications

References 17 publications

Analysis of the effect of load application eccentricity on the stiffness of supports consisting of stack of elements

Analysis of the effect of load application eccentricity on the stiffness of supports consisting of stack of elements

Examination of stiffness of stack of steel elements forming part of supports used for removal of building deflections

Analysis of Concrete‐Filled Square Steel Tube Short Columns under Eccentric Loading

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