Analytical Solution for Lateral‐Torsional Buckling of Concrete‐Filled Tubular Flange Girders with Torsional Bracing

Liu, Yingchun; Hang, Zhaoming; Zhang, Wenfu; Chen, Keshan; Ji, Jing

doi:10.1155/2020/4340381

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…This algorithm does not rely on the use of initial values, and all optimal solutions can be obtained with arbitrary random initial values. 30 Equations ( 10)-( 12) were used for the reliability evaluation of the fitting results:…”

Section: Fitting Methodsmentioning

confidence: 99%

Experimental and numerical research on the bond‐slip behavior of square‐rebar reinforced concrete during the republic of China (1912–1949)

Zhang

Chun

Jin

et al. 2020

Structural Concrete

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Square-rebar reinforced concrete structures during the republic of China (ROC) have special material properties and structural characteristics. To perform nonlinear finite element simulations of this special type of structure more accurately, a specialized bond-slip constitutive model is built.Eighteen central pullout specimens were designed based on the ROC concrete mix proportions and the square-rebar. Then, the test data were fitted with the universal global optimization method and the minimum Euclidean distance point method was chosen to calculate the inflection point matrix of the bondslip constitutive model. Finally, the main factors influencing the bond-slip behavior of the ROC square-rebar reinforced concrete were analyzed. The research results show that the corrosion of the square-rebar produces a negative effect on the whole structure and a modified bond-slip regression curve considering the size effect is obtained. The research results can provide a scientific basis for the nonlinear calculation of ROC square-rebar reinforced concrete structures considering the bond-slip behaviors. Highlights• The universal global optimization method of bond-slip was used to fit the test data.• The minimum Euclidean distance point method and the minimum Mahalanobis distance point method were used to centralize the fitting inflection points.• A modified four-line bond-slip constitutive model considering the size effect was proposed for square-rebar reinforced concrete during the republic of China (1912China ( -1949.• Bond-slip behavior between concrete and rebar was modeled by finite element method.Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Section: Fitting Methodsmentioning

confidence: 99%

Experimental and numerical research on the bond‐slip behavior of square‐rebar reinforced concrete during the republic of China (1912–1949)

Zhang

Chun

Jin

et al. 2020

Structural Concrete

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“…where c 1 , c 2 , c 3 , c 4 , c 5 , c 6 and c 7 are coefficients and the values of coefficients are shown in Table 1. M cr0 is the calculation formula of elastic lateral-torsional buckling of doubly symmetric tubular flange composite beams under concentrated load without lateral bracing, which can be expressed as [33]:…”

Section: Critical Moment Formulamentioning

confidence: 99%

Lateral-Torsional Buckling Analysis for Doubly Symmetric Tubular Flange Composite Beams with Lateral Bracing under Concentrated Load

Liu

Zhang

et al. 2021

Symmetry

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Tubular flange composite beams are increasingly applied in modern bridge structures. In order to investigate the overall stability behavior of doubly symmetric tubular flange composite beams with lateral bracing under concentrated load, the analysis of elastic lateral-torsional buckling is conducted by the energy variation method. The analytical solution of critical moment of doubly symmetric tubular flange composite beams with lateral bracing is obtained. Meanwhile, the simplified calculation formula of critical moment is fitted by 1stOpt software based on 26,000 groups of data, and the accuracy is verified by the finite element method. It is found that, the critical moment rises obviously with increasing lateral bracing stiffness, and adding lateral bracing to doubly symmetric tubular flange composite beams is beneficial to improve the overall stability in engineering practice. Finally, the influence of several parameters including concrete strength, span, steel ratio of flange and height-thickness ratio of web are studied. The results show that the concrete strength and the web height-thickness ratio have a weak influence on critical moment of elastic lateral-torsional buckling, while the influence of span-depth ratio and flange steel ratio is very significant.

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“…Therefore, it has become a key problem to realize the reconstruction of adding stories around the existing buildings without interrupting their function [4]. A novel assembled composite frame, consisting of different strength concrete filled double skin steel tube (CFDST) columns and H-shaped honeycombed composite beams with rectangular concrete filled steel tube (RCFST) flanges, is proposed in this paper [5][6][7][8][9]. Both the columns and beams are connected together through integral joints.…”

Section: Introductionmentioning

confidence: 99%

Axial Compression Behavior of Symmetrical Full-Scale Concrete Filled Double Skin Steel Tube Stub Columns

Bai

et al. 2022

Symmetry

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To investigate the bearing behavior of symmetrical full-scale different strength concrete filled double skin steel tube (CFDST) stub columns, 19 full-scale specimens were designed, considering the slenderness ratio (λ); the compression strength of core concrete and sandwich concrete (fcki, fcko), the thickness of the inner and outer steel tubes (ti, to); the diameter of inner and outer steel tubes (Di, Do); and the tensile strength of the inner and outer steel tubes (fyki, fyko) as the main parameters. Nonlinear constitutive models for concrete considering constraint effect were adopted, and a finite element (FE) model was established using ABAQUS software. By comparing the results between simulations and experiments, the rationality of the modeling method was verified. Based on the FE model, the parameter analysis for CFDST columns were conducted, and the force mechanism, stress distribution, and deformation process were analyzed. The results showed that the axial compression bearing capacity (Nsu) increased significantly with an increase in fcki, to, Do, and fcko, while Nsu decreased gradually with an increase in λ. Finally, according to the calculated results of the specimens, the calculation formula for Nsu of full-scale composite columns was statistically regressed using 1stOpt software and showed a good agreement with the FE.

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Analytical Solution for Lateral‐Torsional Buckling of Concrete‐Filled Tubular Flange Girders with Torsional Bracing

Cited by 5 publications

References 21 publications

Experimental and numerical research on the bond‐slip behavior of square‐rebar reinforced concrete during the republic of China (1912–1949)

Experimental and numerical research on the bond‐slip behavior of square‐rebar reinforced concrete during the republic of China (1912–1949)

Lateral-Torsional Buckling Analysis for Doubly Symmetric Tubular Flange Composite Beams with Lateral Bracing under Concentrated Load

Axial Compression Behavior of Symmetrical Full-Scale Concrete Filled Double Skin Steel Tube Stub Columns

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