Numerical Nonlinear Buckling Analysis of Tapered Slender Reinforced Concrete Columns

Alkloub, Amer; Allouzi, Rabab; Naghawi, Hana

doi:10.1007/s40999-019-00395-5

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…The ultimate cracking strain 𝜀 𝑐𝑟 adopted in the current modelling is taken equal to 7.5 𝜀 𝑐𝑟,𝑓𝑎𝑖𝑙𝑢𝑟𝑒, . (Alkloub et al 2019) used an ultimate cracking strain of 0.00154, while the strain at failure calculated from the material properties is (3.86/22960 = 1.68 × 10 −4 ); it is 9.16-times 𝜀 𝑐𝑟,𝑓𝑎𝑖𝑙𝑢𝑟𝑒 . At any point, the cracking strain 𝜀 𝑐𝑟 is evaluated according to Eq.…”

Section: Tensile Behavior Of Concretementioning

confidence: 99%

3D- ABAQUS Modelling of Prestressed Concrete Hunched Beams with Multi-Openings of Different Shapes

Al-Hilali,

Izzet

2023

jcoeng

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A long-span Prestressed Concrete Hunched Beam with Multi-Opening has been developed as an alternative to steel structural elements. The commercial finite element package ABAQUS/CAE version 2019 has been utilized. This article has presented the results of three-dimensional numerical simulations investigating the flexural behaviour of existing experimental work of supported Prestressed Concrete Hunched Beams with multiple openings of varying shapes under static monotonic loads. Insertion openings in such a beam lead to concentrate stresses at the corners of these openings; as a result, extensive cracking would appear. Correlation between numerical models and empirical work has also been discussed regarding load displacement and crack development, and the obtained outcomes demonstrate a good agreement with the experiments. The ratio of ultimate loads and deflection of the beams tested in the investigation to those of numerical models was 0.98 and 0.97, respectively. So, finite element analysis can be regarded as a behaviour-trustworthy technique for simulating the non-linear behaviour of prestressed concrete rafters with multi-openings from the point of view of complexity, hardly, time-keeping, human effort, and cost.

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Section: Tensile Behavior Of Concretementioning

confidence: 99%

3D- ABAQUS Modelling of Prestressed Concrete Hunched Beams with Multi-Openings of Different Shapes

Al-Hilali,

Izzet

2023

jcoeng

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“…Equation 1shows the chosen trigonometric function for this study, which can be used for structures with varying geometries, as by Wahrhaftig [21] in comparison with computational analyses using the finite element method (FEM). The FEM, as an analysis technique in a similar context, was used by Alkloub et al [22] in order to analyze the buckling of reinforced concrete columns with a truncated cone shape and square cross section; by Rodrigues et al [23] to evaluate the buckling of reinforced concrete columns, eccentrically loaded, considering nonlinearities inherent to the system, including creep; and by Fabro et al [24], who employed polynomial and trigonometric interpolation functions to optimize the application in real structures with low frequency.…”

Section: Mathematical Modelingmentioning

confidence: 99%

Stress assessment in reinforcement for columns with concrete creep and shrinkage through Brazilian technical normative

Wahrhaftig

Magalhães

Nascimento

2020

J Braz. Soc. Mech. Sci. Eng.

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In this paper, the induced stress in longitudinal reinforcement bars with cross sections subjected to concrete creep and shrinkage was evaluated. The study was performed for a reinforced concrete column, with loading varying from zero-in which the structure is exclusively subjected to self-weight-to forces close to the loss of stability by bifurcation of equilibrium. A real precast concrete pole, extremely slender, with geometry varying lengthwise, was the structure chosen for the analysis. The aspects related to the material nonlinearity, as well as creep, shrinkage and the development of characteristic concrete strength, were taken into account following Brazilian normative recommendations in NBR 6118:2014 (Design of structural concrete-Procedure) by the Brazilian Association of Technical Standards (ABNT). The critical buckling load was defined according to the structural frequency by using particularly nonlinear formulations. The results were obtained for different instants without exceeding the expected time for convergence of results. The maximum relative value found for the reinforcement stress was 1.24% of the steel yield strength, eliminating the possibility of yielding material.

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“…Dolayısı ile bu yapılarda dinamik etkilerle ortaya çıkan titreşimlerin ve dalga yayılımının araştırılması, malzeme mühendisliği ve tasarımında meydana gelen gelişmelerle güncelliğini hala korumaktadır [5,6]. Çift simetrili değişken kesitli çubukların uygulamada kullanımına ilişkin örnekler, çelik profil kolonlar [7], betonarme kolonlar [8] ve özellikle dönen makine parçaların (helikopter rotor palası, rüzgar türbini vb.) [9] şeklinde verilebilir.…”

Section: Introductionunclassified

Çi̇ft Si̇metri̇li̇ Deği̇şken Kesi̇tli̇ Çubuklarin Eksenel Ti̇treşi̇mleri̇

Özmutlu

2022

Kırklareli Üniversitesi Mühendislik Ve Fen Bilimleri Dergisi

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Bu çalışmada çift simetrili değişken kesitli çubukların taşıma matrisi yöntemi ile eksenel titreşimleri araştırılmıştır. Ele alınan problemdeki, çubuk açıklık ortasına göre simetrik ve her iki ucundan basit mesnetlidir. Konik çubuk için küresel koordinatlarda yazılan hareket denkleminin degişkenlerine ayırma yöntemi ile Bessel fonksiyonları cinsinden kapalı çözümü yapılmıştır. Simetrik çubuğun 1’inci ve 2’nci bölgesi için çubuk uçlarında durum vektörleri yazılmış ve her iki bölge için taşıma matrisi türetilmiştir. Simetrik çubuk için toplam taşıma matrisi yazılıp sınır koşulları uygulanarak titreşim denklemine ulaşılmıştır. Bu denklemin çözümünden serbest titreşim frekansları ve mod şekilleri farklı koniklik oranları için belirlenmiştir. Koniklik oranın ve simetrinin eksenel titreşim üzerine olan etkisi ortaya konmuştur.

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Numerical Nonlinear Buckling Analysis of Tapered Slender Reinforced Concrete Columns

Cited by 8 publications

References 12 publications

3D- ABAQUS Modelling of Prestressed Concrete Hunched Beams with Multi-Openings of Different Shapes

3D- ABAQUS Modelling of Prestressed Concrete Hunched Beams with Multi-Openings of Different Shapes

Stress assessment in reinforcement for columns with concrete creep and shrinkage through Brazilian technical normative

Çi̇ft Si̇metri̇li̇ Deği̇şken Kesi̇tli̇ Çubuklarin Eksenel Ti̇treşi̇mleri̇

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