TY  - EJOU
AU  - Lin, Ning 

TI  - Experimental Study on the Tensile Performance of Fully Grouted Sleeve Connections after High-Temperature Exposure
T2  - Structural Durability \& Health Monitoring

PY  - 
VL  - 
IS  - 
SN  - 1930-2991

AB  - The fully grouted sleeve connection is a key joint type in precast concrete structures. Its mechanical performance after high-temperature exposure is critical for the post-fire safety assessment of these structures. This paper experimentally investigates the influence of different peak temperatures on the tensile performance of fully grouted sleeve connections. A total of 36 fully grouted sleeve specimens, 36 single rebar specimens, and their corresponding grout cubes were prepared. All specimens were heated to the target temperatures and then cooled naturally. Afterwards, static tensile tests and compressive strength tests were performed. The results show that, compared to the strength at 25°C, the strength decreased by 43% at 600°C. The yield strength and ultimate strength of the steel rebar decreased by 17.2% and 10.5%, respectively, at 600°C. Below 600°C, all the fully grouted sleeve connections experienced tensile fracture of the rebar. At 600°C, the failure mode changed to pull-out failure. The load-displacement curves show that below 400°C, specimens are ductile, but at 600°C, the yield plateau decreases or vanishes. Based on the experimental data, predictive models for the yield stress and ultimate stress of the connections were established. A recommendation for the bond strength parameter k was also proposed, suggesting that a value of k > 1.79 can prevent pull-out failure. These findings provide an experimental basis and theoretical reference for the safety assessment of precast structures after fire.
KW  - Fully grouted sleeve; post-high-temperature; tensile performance; failure mode; bond strength; precast concrete structure

DO  - 10.32604/sdhm.2026.080823