Bearing Capacity of Stone-Lightweight Aggregate Concrete-Filled Steel Tubular Stub Column Subjected to Axial Compression

Zhang, Xianggang; Kuang, Xiaomei; Yang, Jinbao; Fan, Yongzhe

doi:10.1007/s12205-019-2287-0

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…The average ratios of N u1 and N u2 to N u, Exp is 1.031 and 0.967 with the corresponding C.V. of 0.092 and 0.072, respectively. The consequences of Equations ( 10) and (13) showed that there is nearly no difference using these two formulas to calculate the ultimate bearing capacity of the LACFCST stub columns. Equation ( 13) has a relatively conservative calculation result and a simple form, which is beneficial to its application in practical engineering.…”

Section: Formulas Validationmentioning

confidence: 99%

“…ties obtained from test results and Equation ( 10); (b) comparison of the ultimate bearing capacities obtained from test results and Equation (13).…”

Section: Formulas Validationmentioning

confidence: 99%

“…The results suggested that the load-carrying capacity of lightweight aggregate concretefilled steel tubular columns were found to be comparable to conventional concrete-filled specimens, and the circular tubes can provide substantial post-yield strength and stiffness, while the square and rectangular cross-sections cannot. Zhang et al [13] investigated the axial compressive performance of LACFCST stub columns with different replacement ratios of normal gravel aggregate, and the results revealed that the ultimate bearing capacities and the corresponding displacements of the stub columns increased with an increase in the normal gravel replacement ratio. Fu et al [14][15][16][17] conducted experiments on LACFCST stub columns for the interface bond behaviors between the steel tube and infilled LAC, and a calculation method for ultimate bearing capacity was proposed.…”

Section: Introductionmentioning

confidence: 99%

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Analytical Modelling of LACFCST Stub Columns Subjected to Axial Compression

Lyu

Ding

et al. 2021

Mathematics

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This paper presents a numerical investigation of lightweight aggregate concrete-filled circular steel tubular (LACFCST) stub columns under axial compression. A finite 3D solid element model of the LACFCST stub column was established by adopting a plastic-damage constitutive model of lightweight aggregate concrete (LAC). The finite element model (FEM) analysis results revealed that the confinement effect of the steel tube on the infilled LAC was weaker than that on the infilled conventional concrete. A parametric study making use of 95 full-scale FEMs was conducted to investigate the influences of various design parameters of LACFCST stub columns on their ultimate axial bearing capacity and the composite actions. Moreover, a numerical model of the axial and transverse stress of steel tubes at the ultimate state of LACFCST columns was proposed using the regression method. Based on the equilibrium conditions and the proposed model, a practical design formula making use of an enhancement factor was derived to estimate the ultimate bearing capacity of LACFCST stub columns by using the superposition method. The validity of the proposed formula was verified against the experimental data of 49 LACFCST stub column specimens under the axial loading available in the literature. Meanwhile, the accuracy and conciseness of the proposed formula were evaluated by comparison with the formulas suggested by the existing design codes.

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Section: Formulas Validationmentioning

confidence: 99%

“…ties obtained from test results and Equation ( 10); (b) comparison of the ultimate bearing capacities obtained from test results and Equation (13).…”

Section: Formulas Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analytical Modelling of LACFCST Stub Columns Subjected to Axial Compression

Lyu

Ding

et al. 2021

Mathematics

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“…However, compared with ordinary concrete, recycled aggregate concrete possesses certain flaws, such as low strength and a significant degree of water absorption [ 7 , 8 , 9 ]. With respect to this, steel tubes inhibit the generation and development of vertical cracks in concrete, thus the restraining quality of steel tubes can also improve the compressive strength and deformation ability of concrete [ 10 , 11 , 12 , 13 ]. The local buckling of the steel tube may be successfully avoided by the support effect of RAC deformation on the interior of the steel tube during the application of stress.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior Analysis of Recycled Aggregate Concrete-Filled Square Steel Tube Frames

et al. 2023

Self Cite

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In this study, the seismic behavior of a recycled aggregate concrete-filled square steel tube (S-RACFST) frame under different design conditions was investigated. Based on previous studies, a finite element model for the seismic behavior of the S-RACFST frame was developed. Moreover, the axial compression ratio, beam–column line stiffness ratio, and yield bending moment ratio of the beam–column were regarded as the variation parameters. It was through these parameters that the seismic behavior of eight S-RACFST frame finite element specimens was discussed. The seismic behavior indexes, such as the hysteretic curve, ductility coefficient, energy dissipation coefficient, and stiffness degradation were obtained—which, in turn, revealed the influence law and the degree of the design parameters regarding seismic behavior. Moreover, the sensitivity of the various parameters with respect to the seismic behavior of the S-RACFST frame was evaluated via grey correlation analysis. The results show that the hysteretic curves of the specimens were fusiform and full with respect to the different parameters. Firstly, with the axial compression ratio increasing from 0.2 to 0.4, the ductility coefficient increased by 28.5%. In addition, the equivalent viscous damping coefficient of the specimen with the axial compression ratio of 0.4 was 17.9% higher than that of the specimen with the axial compression ratio of 0.2, which was 11.5% as well as that with an axial compression ratio of 0.3. Second, when the line stiffness ratio rises from 0.31 to 0.41, the specimens’ bearing capacity and displacement ductility coefficient both get better. However, the displacement ductility coefficient gradually decreases when the line stiffness ratio is greater than 0.41. As a result, an optimal line stiffness ratio (0.41) thus exhibits good energy dissipation capacity. Thirdly, with the increase in the yield bending moment ratio from 0.10 to 0.31, the bearing capacity of the specimens improves. In addition, the positive and negative peak loads increased by 16.4% and 22.8%, respectively. Moreover, the ductility coefficients were all close to three, thus demonstrating good seismic behavior. The stiffness curve of the specimen with a large yield bending moment ratio with respect to the beam–column, is higher than those that possess a small beam–column yield moment ratio. In addition, the yield bending moment ratio of the beam–column possesses a significant influence on the seismic behavior of the S-RACFST frame. Furthermore, the yield bending moment ratio of the beam–column should be considered first in order to ensure the seismic behavior of the S-RACFST frame.

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“…Different types of lightweight aggregate concrete in columns have been tested both without [14] and with steel profile confinement [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Reduction of the Carbon Footprint of Precast Columns by Combining Normal and Light Aggregate Concrete

Halding

2022

Buildings

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To reduce the global emission of CO2 from the building industry, researchers, architects and manufacturers must consider new ways of constructing precast concrete buildings. Modern concrete columns and walls are not optimized to the applied load, and there is potential to save material. By creating a stronger column core and a lightweight concrete cover, it is possible to reduce the carbon footprint. A method is proposed to calculate such eccentrically loaded columns of two or more materials. The analytical method is developed for straight columns and columns with Entasis. Production of curved Entasis columns is possible by using textile molds due to the low mold pressure from the light aggregate concrete. Two column types are load tested to confirm the method. The CO2 emission is calculated for some column examples, and it shows that an optimized column geometry often leads to a reduced carbon footprint compared to regular columns. The concept is especially efficient for slender columns. Furthermore, the external light aggregate concrete layer ensures protection against fire if high-strength concrete is applied as the column core.

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Bearing Capacity of Stone-Lightweight Aggregate Concrete-Filled Steel Tubular Stub Column Subjected to Axial Compression

Cited by 10 publications

References 28 publications

Analytical Modelling of LACFCST Stub Columns Subjected to Axial Compression

Analytical Modelling of LACFCST Stub Columns Subjected to Axial Compression

Seismic Behavior Analysis of Recycled Aggregate Concrete-Filled Square Steel Tube Frames

Reduction of the Carbon Footprint of Precast Columns by Combining Normal and Light Aggregate Concrete

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