Analytical modeling of bending of circular concrete-filled steel tubes

Moon, Jiho; Roeder, Charles W.; Lehman, Dawn E.; Lee, Hak Eun

doi:10.1016/j.engstruct.2012.04.028

Cited by 147 publications

(77 citation statements)

References 22 publications

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“…For the purpose of this analyses a Concrete Damaged Plasticity model was used. The angle of dilatation was adopted with a value of 20º [1], and the Poisson's coefficient with a value of 0.2. Since the slenderness is in the middle range the effects of confinement is neglected.…”

Section: Constitutive Model For Concretementioning

confidence: 99%

“…Constitutive material models have significant impact on the precision of the results. In the literature many constitutive models are described with smaller or bigger accuracy of concrete and steel behaviour [1,2,3,4,5,6]. Using computer program Abaqus [7] and Riks method which is available in this program critical buckling forces are determined.…”

Section: Introductionmentioning

confidence: 99%

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Proračun Nosivosti Umereno Vitkih I Vitkih CFT Kružnih Stubova

Lazović¹,

Deretić-Stojanović²,

Radovanović³

2017

Zbornik GFS

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Section: Constitutive Model For Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Proračun Nosivosti Umereno Vitkih I Vitkih CFT Kružnih Stubova

Lazović¹,

Deretić-Stojanović²,

Radovanović³

2017

Zbornik GFS

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“…3. 해석 모델의 검증 3.1 실험 및 해석 모델 개요 이 연구의 해석 연구는 Moon et al [10] 에서 제시한 원형 CFT 해석 모델을 적용하였으며 해석 모델의 검증을 위해 Thody [11] 의 휨 실험 결과를 사용하였다. 을 적용하였다 [13] .…”

Section: Fig 1 Cross Section Of Circular Concrete Filled Steelunclassified

Analytical Study of Shear Capacity for Large-Diameter Concrete-Filled Steel Tubes (CFT)

Jung¹,

Yeom²,

Yoo³

2015

Journal of Korean Society of Steel Construction

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-Concrete filled steel tube(CFT), which has superior ductility and strength, is used for building column, bridge piers of ocean structure. Shear design equations of CFT existing in structural design provisions are excessively conservative. It has an effect on constructability and the economics of CFT. However, to suggest the reasonable shear design equation, experimental studies on the shear capacity of CFT have been rarely conducted. This study is analytical research to suggest improved shear design equations of large-diameter concrete-filled steel tubes. This analytical research was conducted to apply finite element analysis model of CFT based on the prior research. It was verified by comparison with prior test results. The verified model was used for parameter studies to estimate the influence of overhang length, concrete compressive strength and diameter-thickness ratio on shear strength.

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“…The relationship between stress and dilatation is shown in Fig. 2 [7]. Dilatation ε' c which corresponds to the strength of concrete on pressure f' c is adopted as 0,003.…”

Section: Determining Boundary Conditions At the Upper End Of The Cft mentioning

confidence: 99%

“…On the accuracy of the obtained results a significant effect has the adopted constitutive model for concrete. In this paper Concrete Damaged Plasticity model was applied, where the angle of dilatation had a value of 20° [7]. Poisson ratio was 0,2.…”

Section: Determining Boundary Conditions At the Upper End Of The Cft mentioning

confidence: 99%

Bearing capacity and stability of elastically fixed CFT slender columns

Lazovic

Radovanović²,

Stojanović

2017

Teh. vjesn.

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Professional paperCFT columns are one of the basic structural elements in "top-down" construction method. Because of the large depth of excavation the question of stability of these columns raises. This paper presents a procedure for calculation of critical buckling force of CFT columns which are on the upper side elastically fixed in the concrete ceiling and on the bottom side elastically fixed in the drilled pile. Using computer programs ABAQUS 6.12 and LPILE, as well as appropriate constitutive models the boundary conditions on the upper and lower end of the CFT columns are determined. For a building called "Cvijetni prolaz" in Zagreb, using program created in Excel the critical buckling force of elastically fixed CFT columns is determined. The dependence of the critical buckling force decreasing with increasing depth of excavation is presented. The impact of concrete class, diameter and wall thickness of the steel section, length and diameter of the pile, the thickness of the ceiling on the critical buckling force of CFT columns is analysed. The results are shown in diagrams and tables. Keywords: CFT column; FEM; p-y curve; stability of bifurcation Nosivost i stabilnost elastično uklještenih CFT vitkih stupovaStručni članak CFT stupovi su jedan od osnovnih konstrukcijskih elemenata u "top-down" metodi gradnje ("odozgor prema dolje"). Kako su dubine iskopa velike postavlje se pitanje stabilnosti ovih stupova. U radu je dan prijedlog postupka proračuna kritične sile izvijanja CFT stupa koji je s gornje strane elastično uklješten u izvedeni strop, a s donje strane elastično uklješten u bušeni pilon. Primjenom programa LPILE i ABAQUS 06.12, kao i odgovarajućih konstitutivnih modela određeni su granični uvjeti na gornjem, odnosno donjem kraju CFT stupa. Za objekt Cvjetni prolaz u Zagrebu primjenom programa modeliranog u Excell-u izračunata je kritična sila izvijanja obostrano elastično uklještenog CFT stupa. Prikazana je ovisnost opadanja kritične sile izvijanja s porastom dubine iskopa. Analiziran je utjecaj klase betona, promjera i debljine zida čeličnog profila, dužina i promjer šipa, debljina stropa na vrijednost kritične sile izvijanja CFT stupa. Dobiveni rezultati prikazani su u dijagramima i tablicama.

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Analytical modeling of bending of circular concrete-filled steel tubes

Cited by 147 publications

References 22 publications

Proračun Nosivosti Umereno Vitkih I Vitkih CFT Kružnih Stubova

Proračun Nosivosti Umereno Vitkih I Vitkih CFT Kružnih Stubova

Analytical Study of Shear Capacity for Large-Diameter Concrete-Filled Steel Tubes (CFT)

Bearing capacity and stability of elastically fixed CFT slender columns

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