Behavior and design of slender circular tubed-reinforced-concrete columns subjected to eccentric compression

Zhou, Xuhong; Liu, Jiepeng; Wang, Xuanding; Chen, Y. Frank

doi:10.1016/j.engstruct.2016.05.036

Cited by 66 publications

(28 citation statements)

References 39 publications

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“…e biggest error is in the comparison with literature [41,42], with Puf/ Put of 0.83. e probable reasons may be the following: differences between Chinese and American codes on the value of material strength, where American codes have higher reliability and safety; differences on the structure types, where literature [41,42] studied piers of bridges, while the FEM simulation in this paper was RC columns of buildings; and differences in time, where experiment in literature [41,42] was carried out in the early 1990s, with a history of nearly 30 years. Compared with literature [45,68,69], Puf/Put is between 0.89 and 0.98. e FEM simulation results are consistent with the experimental data, and the simulation results tend to be safer. e above analysis can fully prove the accuracy and applicability of the FEM model adopted in this paper.…”

Section: Validation Of Fem Modelmentioning

confidence: 60%

“…In order to fully verify the accuracy and effectiveness of the proposed model, the FEM modeling method introduced in Section 4.2 is used to conduct modeling analysis on the samples in similar literature [41,42,45,68,69], and the analysis results are compared with the test data. e following is a brief introduction to the experimental overview of literature [41,42,45,68,69]:…”

Section: Validation Of Fem Modelmentioning

confidence: 99%

“…After searching, there are relatively few studies on the experimental research of circular RC columns strengthened with steel plates. In a broad sense, the circular RC columns strengthened by externally wrapped steel plates belong to the category of circular tube confined RC (hereinafter referred to as CTRC) columns [68,69], and the research on CTRC columns is relatively extensive. e test in literature [68] took the frame columns as the research object and assumed that the columns were fixed at both ends.…”

Section: Validation Of Fem Modelmentioning

confidence: 99%

“…e test results showed that the CTRC columns had good flexural capacity, ductility, and energy dissipation capacity, which effectively improved the brittle failure of high-strength RC columns under high axial compression ratio. Zhou et al [69] made 16 CTRC column specimens and conducted eccentric compression test on them with slenderness ratio, eccentricity, and steel content ratio as parameters. According to the mechanical characteristics, the specimens were divided into two modes, A and B: a model steel pipe wall connected up and down (only slotted at both ends of the specimens); in mode B, the middle part of the steel pipe wall was also slotted, which divided the steel pipe wall into upper and lower parts.…”

Section: Validation Of Fem Modelmentioning

confidence: 99%

“…e test results showed that the long CTRC columns had good ductility and still maintained a high bearing capacity after the peak; with the increase of slenderness ratio and eccentricity, the stiffness of specimens decreased, but ductility increased; mode A and B had no obvious influence on the bearing capacity and ductility of the specimens. e reinforcement diagram of specimens in literature [41,42,45,68,69] is shown in Figure 15, and other test parameters are shown in Table 3. e analysis results are compared with the test data, as shown in Table 3 and Figure 16.…”

Section: Validation Of Fem Modelmentioning

confidence: 99%

See 4 more Smart Citations

Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates

Zhou

Wang

et al. 2019

Advances in Civil Engineering

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Based on a practical project, the construction method of circular reinforced concrete (RC) columns strengthened with externally wrapped steel plates was introduced in this paper. In order to study the bearing capacity and seismic performance of circular RC columns after strengthening, a formula for calculating the bearing capacity of circular RC columns strengthened with externally wrapped steel plates was derived, with reference to the Code for Design of Strengthening Concrete Structure. Through ABAQUS software, the vertical monotone static loading analysis and the horizontal low-cyclic reversed loading analysis were carried out, respectively, before and after the strengthening of the full-size RC columns in this project. The results showed that the bearing capacity of the normal section of the RC column after strengthening was about 80% higher than that before strengthening, and the results of FEM software were in accord with the calculation results of theoretical formula to some degree. Under horizontal low-cyclic reversed loading, the columns after strengthening had both plumper hysteresis curves and higher ductility factors and equivalent viscous damping coefficient than those before strengthening, indicating the energy dissipation capacity, plastic deformation capacity, and seismic performance of the RC columns after strengthening were all obviously improved.

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Section: Validation Of Fem Modelmentioning

confidence: 60%

Section: Validation Of Fem Modelmentioning

confidence: 99%

Section: Validation Of Fem Modelmentioning

confidence: 99%

Section: Validation Of Fem Modelmentioning

confidence: 99%

Section: Validation Of Fem Modelmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates

Zhou

Wang

et al. 2019

Advances in Civil Engineering

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Experimental and numerical investigations on seismic behavior of circular tubed reinforced concrete column to RC beam frames

Liu

Zhou

et al. 2022

Earthq Engng Struct Dyn

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The tubed reinforced concrete (TRC) column is a special kind of concrete‐filled tube (CFT) column where the steel tube is disconnected at the beam–column connection, thereby not directly carrying the axial load while maximizing the confinement effect. Extensive research has been conducted to study the static and seismic performances of TRC columns and their mechanical properties. However, little attention has been paid to study the whole structural system containing TRC columns. To fill this lacking information, an experimental program on the seismic behavior of circular tubed reinforced concrete (CTRC) column to reinforced concrete (RC) beam frames (CTRC frames) was presented in this study for the first time. Two half‐scale two‐story CTRC frames, with two bays in each frame, were designed and tested under quasi‐static loads. The first frame has strong columns and weak beams; while the second frame has rather weak columns and strong beams, implying that plastic hinges may form in the columns under seismic action. The test results indicate that both frames are sufficiently ductile to effectively dissipate energy. However, for the second frame, more severe damages of beams and columns in the first floor were observed, resulting in the instability of the overall frame. A fiber‐based finite‐element model is established using OpenSees; and the numerical results are generally in good agreement with the test results. Utilizing the numerical model, a parametric study is conducted and the preliminary design suggestions on TRC frames are proposed.

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Numerical and machine learning models for concentrically and eccentrically loaded CFST columns confined with FRP wraps

Xu,

Zhang,

Isleem

et al. 2024

Structural Concrete

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Previous research largely concentrated on predicting load‐carrying capacities of concrete‐filled steel tubes (CFST) confined with fiber‐reinforced polymer (FRP) wraps under pure concentric loads, neglecting the more complex failure mechanisms that occur under real‐life eccentric loading conditions. This study, therefore, employs both finite element modeling (FEM) and machine learning methods to accurately predict the load‐bearing capacities under both concentric and eccentric loading conditions. This research analyzed a comprehensive dataset comprising 128 experimental tests and an equivalent number of FEM simulations designed to evaluate their eccentric performance. These models have been thoroughly generated and validated against existing literature. Additionally, the developed ML models, particularly a hybrid deep learning model, demonstrated significant predictive accuracy, with an average R2 value of 0.969 across all model folds. Partial dependence analysis further highlighted the significant influence of concrete strength and the interactive effects of steel tube area and FRP wrap thickness on the load‐carrying capacity of the columns. Furthermore, to enhance cost‐efficiency and resource management compared with traditional laboratory testing, a user‐friendly graphical user interface (GUI) has been developed and hosted on an open‐source platform such as GitHub. This interface supports real‐time, precise predictive capabilities and promotes a collaborative environment for ongoing model refinement and improvement.

show abstract

Behavior and design of slender circular tubed-reinforced-concrete columns subjected to eccentric compression

Cited by 66 publications

References 39 publications

Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates

Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates

Experimental and numerical investigations on seismic behavior of circular tubed reinforced concrete column to RC beam frames

Numerical and machine learning models for concentrically and eccentrically loaded CFST columns confined with FRP wraps

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