Experimental investigation on the post-fire cyclic behavior of grouted sleeve connections

Tan, Wenjun; Yu, Min; Li, Xiangyu; Yan, Zegang; Saafi, Mohamed; Ye, Jianqiao

doi:10.1016/j.conbuildmat.2021.122394

Cited by 14 publications

(2 citation statements)

References 26 publications

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“…A temperature of 400 • C marks the point at which the full-grouted sleeve failure mode transitions under cyclic load. At 600 • C, none of the specimens can withstand cyclic loading [25][26][27]. However, there are few studies on the steering temperature of half-grouted sleeve failure mode after high temperature.…”

Section: Introductionmentioning

confidence: 99%

Post-Fire Mechanical Properties of Half-Grouted Sleeve Connectors with Grouting Defects

Hu,

Jiang,

Chen

et al. 2024

Buildings

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Half-grouted sleeve connectors are a primary method for connecting rebar in prefabricated concrete structures. However, due to limitations in the construction environment, all kinds of grouting defects are inevitable, especially grouting voids. Additionally, fire disasters, among the most common types of disasters, significantly threaten the structural performance and safety of these prefabricated structures. Therefore, it is imperative to determine the mechanical properties of half-grouted sleeve connectors with grouting voids after high temperatures. This study designed and prepared 48 groups of half-grouted sleeve specimens with different grouting voids and defect locations. These specimens were heated to the specified temperature (25 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C), followed by unidirectional tensile testing after natural cooling. The experimental results showed that rebar fracture failure and rebar pulled-out failure were the failure modes of specimens. With the increase in temperature, bearing capacity, safety factor and ductility coefficient of specimens all decreased. When the temperature was lower than 400 °C, the specimen with void length less than twice the diameter of the rebar (i.e., 2d) had sufficient connection performance. For specimens with the same total void lengths, the bearing capacity of discrete voids is lower than concentrate voids at the same temperature. The load-displacement curve, safety coefficient, ductility coefficient and grey correlation degree of half-grouted sleeve specimens with grouting voids at different temperatures are analyzed and discussed, and the bond stress slip constitutive model is given. Grouting defects have greater influence on specimens after grey correlation analysis. Findings from this study provide valuable references for the safety performance evaluation of prefabricated structures with half-grouted sleeve connectors after exposure to fire.

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Section: Introductionmentioning

confidence: 99%

Post-Fire Mechanical Properties of Half-Grouted Sleeve Connectors with Grouting Defects

Hu,

Jiang,

Chen

et al. 2024

Buildings

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“…Zhao et al [20] showed that the peak loads of grouted sleeve connectors were reduced after cyclic loading. Wang et al [21] carried out tests of grouted sleeve connections under cyclic loading, and the results showed that buckling of steel occurred for all grouted sleeve connections under cyclic loads.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Test of Sleeve Grouted Lapping Connectors under Uniaxial Tension and High-Stress Repeated Tension and Compression Loading

Tang

et al. 2022

Applied Sciences

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In this study, uniaxial tension tests and high-stress repeated tension and compression tests were conducted on 32 APC (all vertical members precast in concrete structures) connectors. After high-stress repeated tension and compression, the bearing capacities of the connector specimens improved due to the strengthening of the steel bars, and the ductility of the specimens was reduced due to the further development of cracks between the steel bars and the grout. The residual deformation values of the specimens, namely u0 (uniaxial tension) and u20 (repeated tension and compression), were reduced with the increase in the lapping length of the specimens. The longitudinal compressive strain and hoop tensile strain of the middle section of the sleeve near the steel bar side were reduced under the ultimate load state when the specimens were stretched under uniaxial tension and in the last tension process after repeated loading with the increase in the lapping length. The distribution and development of the longitudinal compression stress of the sleeve were analysed based on the bonding stress of the steel bar and concrete. Finally, the ultimate bonding strength and critical lapping length formulas were proposed, which involved the introduction of a grouting defect coefficient ω.

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Research on the Sleeve Grouting Fullness Testing of Prefabricated Structures Based on Piezoelectric Method

Du,

Sun,

Yang

et al. 2024

KSCE J Civ Eng

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Experimental investigation on the post-fire cyclic behavior of grouted sleeve connections

Cited by 14 publications

References 26 publications

Post-Fire Mechanical Properties of Half-Grouted Sleeve Connectors with Grouting Defects

Post-Fire Mechanical Properties of Half-Grouted Sleeve Connectors with Grouting Defects

Mechanical Test of Sleeve Grouted Lapping Connectors under Uniaxial Tension and High-Stress Repeated Tension and Compression Loading

Research on the Sleeve Grouting Fullness Testing of Prefabricated Structures Based on Piezoelectric Method

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