Experimental study and theoretical prediction of flexural behaviors of reinforced SFRELC beams

Zhao, Mingshuang; Li, Changyong; Su, Jiuzhou; Shang, Pengran; Zhao, Shunbo

doi:10.1016/j.conbuildmat.2019.03.037

Cited by 16 publications

(21 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The loading device consisting of the steel frame, hydraulic jack, and distributive girder, and the loads were controlled by the load sensors. The mid-span deflection was measured by the electrical displacement meters installed at the mid-span, loading sections, and supports [26,37]. To verify the assumption of plane cross-section, six electrical strain meters were arranged along the depth of the mid-span cross-section.…”

Section: Test Methodsmentioning

confidence: 99%

“…The flexural ductility of reinforced concrete beams is always defined as the ratio of deflection δ i at a post-peak moment to that δ y corresponding to the yield of longitudinal tensile rebar. Of which, δ 0.85 , δ 0.95 , and δ 1.0 were normally taken as the deflection at the post-peak moment of 0.85M u , 0.95M u , and M u [26,42]. The flexural ductility index β i is computed as follows:…”

Section: Mid-span Deflection and Flexural Ductilitymentioning

confidence: 99%

“…This indicates the effect of steel fiber on the cracking resistance of reinforced SFR-CRAC beams depends on the enhancement of tensile strength of SFR-CRAC, and the increment of Mfcr of reinforced SFR-CRAC beams can be predicted by the increment of fft with the same vf. Based on the principle of Materials Mechanics, and considering the beneficial effect of subsistent plasticity of SFR-CRAC in the tensile zone of the cross-section, the Mfcr of reinforced SFR-CRAC beam can be predicted by the following formulas [26,38,39]:…”

Section: Cracking Resistancementioning

confidence: 99%

“…where I0 is the inertia moment of transformed section to its centroid; y0 is the distance of centroid to compressive edge of transformed section; αE is the ratio of the modulus of elasticity of the rebar to Based on the principle of Materials Mechanics, and considering the beneficial effect of subsistent plasticity of SFR-CRAC in the tensile zone of the cross-section, the M fcr of reinforced SFR-CRAC beam can be predicted by the following formulas [26,38,39]:…”

Section: Cracking Resistancementioning

confidence: 99%

“…In view of the engineering structural application, the bending performances of reinforced SFR-CRAC flexural members such as beams and plates also need to be studied [23]. This is, in fact, a basic work for the new kinds of concrete applied in structures; for example, the recycled aggregate concrete, the steel fiber reinforced expanded-shale lightweight concrete [24][25][26]. Therefore, to further verify the applicability and adaptability of SFR-CRAC for the concrete structures, the loading performances of reinforced SFR-CRAC flexural members should be confirmed with the comparison of current design methods specified in codes [23,[27][28][29].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Bending Performance of Steel Fiber Reinforced Concrete Beams Based on Composite-Recycled Aggregate and Matched with 500 MPa Rebars

Pei

Fan

et al. 2020

Materials

View full text Add to dashboard Cite

To promote the engineering application of recycled aggregate for concrete production with good adaptability and economic efficiency, this paper performed a campaign to investigate the flexural performance of steel fiber reinforced composite-recycled aggregate concrete (SFR-CRAC) beams matched with 500 MPa longitudinal rebars. The composite-recycled aggregate has features of the full use recycled fine aggregate and small particle recycled coarse aggregate, and the continuous grading of coarse aggregate ensured by admixing the large particle natural aggregate about 35% to 45% in mass of total coarse aggregate. The properties of SFR-CRAC have been comprehensively improved by using steel fibers. With a varying volume fraction of steel fiber from 0% to 2.0%, 10 beam specimens were produced. The flexural behaviors of the beams during the complete loading procedure were experimentally studied under a four-point bending test. Of which the concrete strain at mid-span section, the appearance of cracks, the crack distribution and crack width, the mid-span deflection, the tensile strain of longitudinal rebars, and the failure patterns of the beams were measured in detail. Results indicated that the assumption of plane cross-section held true approximately, the 500 MPa longitudinal rebars worked at a high stress level within the limit width of cracks on reinforced SFR-CRAC beams at the normal serviceability, and the typical failure occurred with the yield of 500 MPa longitudinal rebars followed by the crushed SFR-CRAC in compression. The cracking resistance, the flexural capacity, and the flexural ductility of the beams increased with the volume fraction of steel fiber, while the crack width and mid-span deflection obviously decreased. Finally, by linking to those for conventional reinforced concrete beams, formulas are suggested for predicting the cracking moment, crack width, and flexural stiffness at normal serviceability, and the ultimate moment at bearing capacity of reinforced SFR-CRAC beams.

show abstract

Section: Test Methodsmentioning

confidence: 99%

Section: Mid-span Deflection and Flexural Ductilitymentioning

confidence: 99%

Section: Cracking Resistancementioning

confidence: 99%

Section: Cracking Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations