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- W4307816133 abstract "This paper designed a two-layered functionally graded ultra-high performance concrete (FGUHPC) member to meet the bearing and fire-resistant requirements subjected to elevated temperature, where the UHPC layer was used to bear loads and was protected by the lightweight aggregate concrete (LWAC) layer from high temperature. Debonding tests were conducted to evaluate its interfacial behaviors under ambient and high temperatures and the effect of cast-in bolts were investigated. The results showed that all specimens exhibited good fire-resistant behaviors, no visible cracks and spalling were observed for the UHPC layers while the LWAC layers maintained good integrality. Embedded bolts could significantly improve the initial stiffness, bond strength and post-peak ductility of specimens under direct tension at room temperature. The enhancement of bond strength was 40.0 % and 56.5 % when employing bolts with a diameter of 10 mm and 12 mm while that of ultimate displacement was 62.2 % and 58.1 % respectively compared with the specimens without bolts. In the case of high temperature, all specimens showed brittle failure, the bond strength obviously decreased and the effect of bolts on bond behaviors was insignificant due to the deterioration of the LWAC layers. All specimens without bolts showed debonding failure during the tests while the failure mode was converted from breakout to splitting or pullout for the specimens with bolts as the temperature increased." @default.
- W4307816133 created "2022-11-06" @default.
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- W4307816133 date "2023-01-01" @default.
- W4307816133 modified "2023-10-16" @default.
- W4307816133 title "Evaluation of bond behaviors on functionally graded ultra-high performance concrete (FGUHPC) subjected to elevated temperature" @default.
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- W4307816133 doi "https://doi.org/10.1016/j.engstruct.2022.115112" @default.
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