Study on the interfacial shear behavior of steel-UHPC glued composite decks.
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| Title: | Study on the interfacial shear behavior of steel-UHPC glued composite decks. |
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| Authors: | Hu, Zebin1 (AUTHOR), Zhu, Cong1 (AUTHOR), Zheng, Guanghui1 (AUTHOR), Li, Yinglan1 (AUTHOR), Deng, Jun1 (AUTHOR) dengjun@gzhu.edu.cn |
| Source: | Engineering Structures. Apr2026:Part C, Vol. 353, pN.PAG-N.PAG. 1p. |
| Subjects: | Interfaces (Physical sciences), Adhesive joints, Finite element method, High strength concrete, Epoxy resins, Stiffness (Engineering) |
| Abstract: | Steel-ultra-high-performance concrete (UHPC) glued composite decks (SUGCDs) have been developed as an effective solution to enhance the stiffness of the orthotropic steel deck (OSD) while mitigating the stress concentration and welding residual stresses that studs typically induce. The performance of the steel-UHPC interface is crucial in SUGCD systems to ensure composite action. In this study, two types of interfacial treatments were adopted. The first type, called EA interfaces, involves epoxy resin interfaces with sprinkled aggregates (bauxite, steel slag, or silica sand). The second type involves an adhesive interface using styrene-butadiene rubber (SBR) or a dedicated interface adhesive (IA). Push-out tests and finite element (FE) analyses were performed to investigate the shear behavior of these interfaces. The results show that the silica sand-EA interface on sandblasted steel caused failure within the UHPC layer and achieved a high ultimate shear stress of 5.49 MPa. In contrast, the aggregate strength limited the ultimate shear stresses of the bauxite-EA and steel slag-EA interfaces and caused aggregate shear failure. The SBR interface and IA interface reached ultimate shear stress values of approximately 0.6 MPa and 0.45 MPa, respectively. A comparative analysis revealed that the SUGCD with the silica sand-EA interface exhibited a flexural strength 2.6 times that of conventional stud-connected steel-UHPC composite decks and significantly enhanced stiffness. • The silica sand-EA interface achieved an ultimate shear stress of 5.49 MPa, accompanied by a failure mode of UHPC fracture. • Sandblasting changed the failure mode of the EA interfaces from ER-steel debonding to ER-aggregates-UHPC interface failure. • The flexural stiffness of the SUGCD with a silica sand-EA interface were higher than those of the SUCD with studs. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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