Research on the Mechanical Properties of Half-Grouted Sleeve Connections Under Cyclic Loading After High-Temperature Exposure

SHI Jiayi; LI Junhua; CHEN Pingjun; GUO Fei; WANG Weichen

doi:10.3724/j.gyjzG25031101

Volume 56 Issue 7

Jul. 2026

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SHI Jiayi, LI Junhua, CHEN Pingjun, GUO Fei, WANG Weichen. Research on the Mechanical Properties of Half-Grouted Sleeve Connections Under Cyclic Loading After High-Temperature Exposure[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(7): 81-89. doi: 10.3724/j.gyjzG25031101

Citation:

SHI Jiayi, LI Junhua, CHEN Pingjun, GUO Fei, WANG Weichen. Research on the Mechanical Properties of Half-Grouted Sleeve Connections Under Cyclic Loading After High-Temperature Exposure[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(7): 81-89. doi: 10.3724/j.gyjzG25031101

Citation:

SHI Jiayi, LI Junhua, CHEN Pingjun, GUO Fei, WANG Weichen. Research on the Mechanical Properties of Half-Grouted Sleeve Connections Under Cyclic Loading After High-Temperature Exposure[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(7): 81-89. doi: 10.3724/j.gyjzG25031101

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Research on the Mechanical Properties of Half-Grouted Sleeve Connections Under Cyclic Loading After High-Temperature Exposure

doi: 10.3724/j.gyjzG25031101

School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China

Received Date: 2025-03-11
Available Online: 2026-08-31
Publish Date: 2026-07-20

Abstract

Abstract

To investigate the effects of high temperature on the mechanical properties of half-grouted sleeve connections（HGSCs） under seismic loading， thirty HGSC specimens were prepared. These specimens were heated to various target temperatures and then subjected to two loading types： high-stress repeated tension-compression tests and large-deformation repeated tension-compression tests. Through tests， this study examined the failure modes， bearing capacity， and bonding characteristics of connectors under seismic loading after exposure to high temperatures. The test results indicated that under the same temperature conditions， the grout-filled sleeve connections exhibited consistent failure modes under the two loading modes. When the exposure temperature was 400 ℃ or lower， the specimens failed due to tensile fracture of the rebars at the sleeve’s external end. In contrast， when the temperature exceeded 600 ℃， the specimens failed by bond-slip at the grout-to-rebar interface. As the temperature increased， the material properties of both the rebars and the grout gradually degraded， leading to a reduction in ultimate tensile strength， bond stress， and ductility. This degradation was significantly more pronounced in specimens subjected to large-deformation repeated loading than in those under high-stress repeated loading. Finally， a formula for calculating the bond stress of HGSCs under these two cyclic loading conditions after high-temperature exposure was proposed based on statistical regression. The maximum error between the calculated results and the experimental data was within 15%.

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References(21)

References

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