Flexural behavior of steel fiber reinforced self-stressing recycled aggregate concrete-filled steel tube

Liu, Zhenzhen; Lu, Yiyan; Zong, Shuai; Yi, Si

doi:10.1016/j.jclepro.2020.122724

Cited by 34 publications

(15 citation statements)

References 68 publications

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“…Furthermore, the moment vs. longitudinal tensile strain relationships obtained at the mid-span of the steel tube of the filled specimens are presented in Figure 6 . In this figure, it can be seen that the moment–strain relationships showed a fairly typical behaviour for all of the filled specimens regardless of the percentages of replacement aggregate in the concrete material [ 11 , 24 ]. The strain gauges SG1 and SG2 (see Figure 2 ) showed gradually increasing negative values (compression stress) with the increasing of the bending loads, while the strain gauges located at the bottom-half of beam’s cross-section (SG4 and SG5) showed gradual increases in their tension-related stress values.…”

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

“…A dependent stress–strain model was developed for the CFST column [ 23 ]. The flexural behaviour of steel-fibre-reinforced self-stressing recycled-aggregate CFST was studied by [ 24 ]. The behaviour of heated CFST stub columns, containing steel fibre and tire rubber, was tested by [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, engineers have been increasingly utilizing the recycled aggregate generated from the demolition of existing materials and waste materials in the field of construction [ 24 , 32 , 33 , 34 ]. There have been several studies on the behaviour of Recycled-Aggregate Concrete (RAC) material, which is prepared by crushing the old structural elements of concrete.…”

Section: Introductionmentioning

confidence: 99%

“…There have been several studies on the behaviour of Recycled-Aggregate Concrete (RAC) material, which is prepared by crushing the old structural elements of concrete. For example, variations in the RAC replacement percentages (0%, 25% and 50% of the raw aggregate) were adopted in the concrete infill material for CFST members under flexural and compression loads [ 11 , 24 , 35 , 36 , 37 , 38 , 39 , 40 ]. The results achieved were quite similar to those obtained for CFST members filled with normal concrete, albeit with slightly lower strength capacities [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

“…The results achieved were quite similar to those obtained for CFST members filled with normal concrete, albeit with slightly lower strength capacities [ 38 ]. Recently, Liu et al [ 24 ] used RAC and sulphoaluminate cement in varied concrete mixtures, which were reinforced with steel fibre and used as infilling material for 54 CFST beams. Their experimental study reveals that the reinforcement of the recycled-aggregate concrete mixture with 1.2% steel fibre can achieve similar flexural behaviour to that of the CFST beams that are filled with normal concrete.…”

Section: Introductionmentioning

confidence: 99%

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Flexural Strength of Internally Stiffened Tubular Steel Beam Filled with Recycled Concrete Materials

et al. 2021

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The flexural strength of Slender steel tube sections is known to achieve significant improvements upon being filled with concrete material; however, this section is more likely to fail due to buckling under compression stresses. This study investigates the flexural behavior of a Slender steel tube beam that was produced by connecting two pieces of C-sections and was filled with recycled-aggregate concrete materials (CFST beam). The C-section’s lips behaved as internal stiffeners for the CFST beam’s cross-section. A static flexural test was conducted on five large scale specimens, including one specimen that was tested without concrete material (hollow specimen). The ABAQUS software was also employed for the simulation and non-linear analysis of an additional 20 CFST models in order to further investigate the effects of varied parameters that were not tested experimentally. The numerical model was able to adequately verify the flexural behavior and failure mode of the corresponding tested specimen, with an overestimation of the flexural strength capacity of about 3.1%. Generally, the study confirmed the validity of using the tubular C-sections in the CFST beam concept, and their lips (internal stiffeners) led to significant improvements in the flexural strength, stiffness, and energy absorption index. Moreover, a new analytical method was developed to specifically predict the bending (flexural) strength capacity of the internally stiffened CFST beams with steel stiffeners, which was well-aligned with the results derived from the current investigation and with those obtained by others.

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Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flexural Strength of Internally Stiffened Tubular Steel Beam Filled with Recycled Concrete Materials

et al. 2021

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Eccentric loading behavior of steel tube columns filled with steel‐fiber‐reinforced recycled concrete

Liu

Huang

et al. 2022

Structural Concrete

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A comprehensive study focuses on the eccentric compressive behavior of steel‐fiber‐reinforced recycled concrete filled steel tube (SRCFST) columns. A total 39 stub columns are tested, and the variables include eccentricity ratio (e/r), steel fiber volume, quality replacement rate of recycled aggregate, concrete strength grade, and diameter–thickness ratio of steel tube. Failure mode, the load–lateral deflection behavior and the moment–curvature response are analyzed. The load–moment interaction relationships, the load–strain responds and the neutral axis position are researched. The results show that the use of recycled aggregate causes the little‐to‐no influence on the eccentric loaded performance of SRCFST columns with a relative smaller e/r. However, the ultimate load and deformability of the columns with higher e/r both decreases rapidly. Adding steel fibers can offset this adverse effect. The addition of steel fibers sustains a higher relative compression region height in the cross section. The ultimate load descent of SRCFST columns due to the increase of e/r is slower than ordinary concrete filled steel tube and recycled aggregate concrete filled steel tube columns. Moreover, on the basis of the unified theory, a calculation model is proposed to predict the ultimate capacity of SRCFST columns under combined loadings. The model captures well the compressive response of SRCFST columns.

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Research advances in fiber‐reinforced concrete‐filled steel tube columns

Liu,

Ma,

et al. 2024

Structural Design Tall Build

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SummaryFiber‐reinforced concrete‐filled steel tube (CFST) adopts the microskeleton and bridging effect of fibers, thereby optimizing the confinement effect between the steel tube and concrete core while reducing the concrete core friability. This structure offers a viable solution for solving the interface disengagement and insufficient ductility problems of conventional CFSTs. For further theoretical research and engineering application, the mechanical properties of fiber‐reinforced CFSTs under different loading conditions are reviewed. The research results are summarized, and future research scopes are suggested. The literature review shows that adding fibers improves the ductility of CFSTs significantly but the bearing capacity only slightly. The bond strength between steel tube and concrete core is enhanced by fibers, and the degradation in the bond strength is simultaneously delayed. However, in existing research, the mechanical properties and design method are still inadequate. More experimental works, further theoretical analyses, and numerical simulation should be undertaken to establish the quantitative relations between the generalized fiber parameters and structural performance of CFSTs. Future research should propose a unified design theory of fiber‐reinforced CFST structures based on service performance requirements.

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Flexural behavior of steel fiber reinforced self-stressing recycled aggregate concrete-filled steel tube

Cited by 34 publications

References 68 publications

Flexural Strength of Internally Stiffened Tubular Steel Beam Filled with Recycled Concrete Materials

Flexural Strength of Internally Stiffened Tubular Steel Beam Filled with Recycled Concrete Materials

Eccentric loading behavior of steel tube columns filled with steel‐fiber‐reinforced recycled concrete

Research advances in fiber‐reinforced concrete‐filled steel tube columns

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