Axial compressive behaviour and design calculations on recycled aggregate concrete-filled steel tubular (RAC-FST) stub columns

Lyu, Wan-Qing; Han, Lin‐Hai; Hou, Chunfeng

doi:10.1016/j.engstruct.2021.112452

Cited by 54 publications

(10 citation statements)

References 36 publications

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“…Pacheco et al suggest that the conversion coefficient of 150 mm cubic to cylinder with a diameter of 150 mm for recycled concrete is 0.77 [56]. Additionally, the conversion coefficient of 150 mm cubic to prism with dimensions of 150 mm × 150 mm × 300 mm for recycled concrete is 0.67 [57,58].…”

Section: Theory Calculation Formulas For Ultimate Capacity Of Design ...mentioning

confidence: 99%

Strength Behavior and Ultimate Capacity Prediction of Self-Compacting Concrete-Filled Thin-Walled Medium-Length Steel Tubular Columns under Eccentric Compression

Wang,

Sun,

Zhang

et al. 2023

Buildings

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The development of self-compacting concrete-filled thin-walled steel tubular columns is a potential strategy to ease the challenge of conserving resources in society, which are largely consumed by the quickly developing civil industry. However, the application of these columns in the civil industry is rare due to insufficient research, especially research concerning the strength behaviors of the columns under eccentric compression. Therefore, the eccentric compressive behaviors of medium-length tubular columns made up of self-compacting concrete and thin-walled steel with circular sections were experimentally studied in the present paper. The feasibility of predicting the columns’ ultimate capacities using existing design codes was explored, and then comparisons between the predictions and experimental values were carried out. The results showed that the eccentric compression columns had a failure morphology, buckling together with a lateral deflection while they were moved from the bottom to middle positions as the wall thickness increased. Moreover, the ratios of the predicted ultimate capacity of the eccentric compressive columns to the experimental values were within the range of 0.35 to 0.94. This indicates that the predicted ultimate capacity is conservative and safe. The codes AISC-LRFD and JCJ 01-89 achieved the most conservative and the most precise predictive results, respectively. Additionally, the decrease ratio of the predicted ultimate capacity of the eccentric compressive columns to the experimental values was more evident than that of axial compressive columns. This paper can serve as guidance for the design and application of these columns, as well as foster a sustainable and resilient civil industry.

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Section: Theory Calculation Formulas For Ultimate Capacity Of Design ...mentioning

confidence: 99%

Strength Behavior and Ultimate Capacity Prediction of Self-Compacting Concrete-Filled Thin-Walled Medium-Length Steel Tubular Columns under Eccentric Compression

Wang,

Sun,

Zhang

et al. 2023

Buildings

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“…The composite structures of steel tubular and concrete can significantly improve the stiffness of members and meet the functional requirement of deformation and stiffness when the structures are in normal use. In addition, the members formed by combining steel tubular with recycled concrete can not only make up for the shortage of recycled concrete, but also reduce the environmental damage caused by natural aggregate mining and partially solve the problems of environmental pollution and land occupation caused by construction waste landfill [4][5][6]. The combination of high-strength steel (HSS) tubular and HSC can reach the strength potential of HSS and ultra-high-performance concrete (UHPC), reduce the weight of civil engineering structures, and provide remarkable social and economic benefits [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…The ductility of UHSSCCFST columns was usually lower than that of ordinary- As the most basic structural member, the axial compression behavior of CFST columns has been widely studied. Lyu et al [5] carried out axial compression research on 32 recycled CFST (RCFST) short columns, considering the replacement ratio of recycled coarse aggregate (RCA). RCA can affect the ultimate strength and elastic modulus.…”

Section: Introductionmentioning

confidence: 99%

“…For example, some models use cube compressive strength, and some models use cylinder compressive strength, which brings some inconvenience to the application of models. (3) Most existing confinement models for CFST only regard the D/t as a key parameter, without considering the size effect; (4) there is no unified model to predict the axial bearing capacity of CFST columns with different types of concrete and steel, which brings inconvenience to the application of the model; (5) the calculation theories of CFST mainly include unified theory, superposition theory, and limit equilibrium theory. The difference between the three calculation theories lies in the understanding angle of CFST and the estimation of the degree of co-operation between steel tubular and core concrete.…”

Section: Introductionmentioning

confidence: 99%

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Unified Model for Axial Bearing Capacity of Concrete-Filled Steel Tubular Circular Columns Based on Hoek–Brown Failure Criterion

Zhou

2023

Buildings

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Concrete-filled steel tubular (CFST) composite columns can overcome the brittleness of concrete and improve the plastic deformation ability of concrete, thus improving its strength and deformation ability. At present, most of the published models for predicting the axial bearing capacity of CFST columns are empirical models based on the nonlinear fitting of experimental data, which has some limitations on the application of the models. Therefore, to establish a new unified theoretical model, a new ultimate compressive strength of core concrete was established by the Hoek–Brown failure criterion, and the conversion formula between the cube and cylinder compressive strength was also established in this paper. At the same time, the strength-reduction coefficient influenced by the slenderness ratio was also established. The newly established unified model can predict the axial bearing capacity of CFST columns with different steel types, concrete types, slenderness ratios, diameter-to-thickness ratios, and cross-sectional dimensions. At the same time, the newly established unified model can be applied to a wider range of test parameters. To determine the parameters in the proposed model and assess the models, a total of 798 test data were collected. Based on the test database, the existing models and the proposed model were evaluated. The results show that the proposed model has very high accuracy in predicting the test results of CFST short and long columns, and the average value (AV) and integral absolute error (IAE) are 1.012 and 0.094, respectively. In addition, the model proposed in this paper also has high accuracy in predicting the axial bearing capacity of CFST columns under high temperatures.

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“…The results showed that the source and the replacement ratio of recycled aggregates slightly affect the static responses and collapse process of the RACFST specimens. An experimental study that contains 32 RACFST specimens was reported by Lyu [ 25 ]. The confinement factor and the material strength were found to be the most influential to the bearing capacity of the columns, while the replacement ratio of coarse aggregate considerably affects the strength index of the RAC.…”

Section: Introductionmentioning

confidence: 99%

Confinement Effect and Efficiency of Concentrically Loaded RACFCST Stub Columns

et al. 2021

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Recycled aggregate concrete-filled steel tubular (RACFST) columns are widely recognized as efficient structural members that can reduce the environmental impact of the building industry and improve the mechanical behavior of recycled aggregate concrete (RAC). The objective of this study is to investigate the behavior of recycled aggregate concrete-filled circular steel tubular (RACFCST) stub columns subjected to the axial loading. Three-dimensional finite element (FE) models were established using a triaxial plastic-damage constitutive model of RAC considering the replacement ratio of recycled aggregates. The FE analytical results revealed that the decreased ultimate bearing capacity of RACFCST stub columns compared with conventional concrete infilled steel tubular (CFST) columns was mainly due to the weakened confinement effect and efficiency. This trend will become more apparent with the larger replacement ratio of recycled aggregates. A practical design formula of the ultimate bearing capacity of RACFCST stub columns subjected to axial load was proposed on the basis of the reasonably simplified cross-sectional stress nephogram at the ultimate state. The derivation process incorporated the equilibrium condition and the superposition theory. The proposed equation was evaluated by comparing its accuracy and accessibility to some well-known design formulae proposed by other researchers and some widely used design codes.

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Axial compressive behaviour and design calculations on recycled aggregate concrete-filled steel tubular (RAC-FST) stub columns

Cited by 54 publications

References 36 publications

Strength Behavior and Ultimate Capacity Prediction of Self-Compacting Concrete-Filled Thin-Walled Medium-Length Steel Tubular Columns under Eccentric Compression

Strength Behavior and Ultimate Capacity Prediction of Self-Compacting Concrete-Filled Thin-Walled Medium-Length Steel Tubular Columns under Eccentric Compression

Unified Model for Axial Bearing Capacity of Concrete-Filled Steel Tubular Circular Columns Based on Hoek–Brown Failure Criterion

Confinement Effect and Efficiency of Concentrically Loaded RACFCST Stub Columns

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