Shear performance and failure process of perfobond connector in steel-UHPC composite structures

Liu, Yangqing; Yang, Haiyan; Luan, Liujie; Liu, Yuqing; Du, Xiaoqing

doi:10.1016/j.istruc.2023.02.106

Cited by 13 publications

(1 citation statement)

References 35 publications

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“…Four 30 mm diameter circular holes are drilled on each NPBL at 100 mm intervals and perforated with 10 mm diameter ribbed rebars. The perforating rebars can not only improve the bearing capacity and ductility of NPBLs along the longitudinal direction (Liu et al, 2023), but improve the transverse flexural performance of composite deck. The NPBLs can also support the reinforcement mesh and the notches on them can facilitate its positioning.…”

Section: Design Aspectsmentioning

confidence: 99%

Numerical and experimental study of a segmentally prefabricated orthotropic steel–ultra-high-performance concrete composite deck for long-span cable-stayed bridges

Tan,

Fang,

Zhu

et al. 2023

Advances in Structural Engineering

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Utilizing the high strengths, toughness, and durability of ultra-high-performance concrete (UHPC), a segmentally prefabricated orthotropic steel–UHPC composite deck (POSUCD) system has been developed for long-span cable-stayed bridges. The deck system combines an orthotropic steel deck (OSD) with a reinforced UHPC layer using notched perfobond strips (NPBLs). The UHPC layer is prefabricated onto the OSD of the girder segment in the factory to form the POSUCD. After the precast UHPC layer is cured, the girder segments are transported to the bridge site and assembled. The precast UHPC layers are then connected via transverse wet joints before tensioning stay cables. Against the background of the Danjiangkou Reservoir Bridge with a main span of 760 m, finite element (FE) analysis was conducted to examine the stress state and flexural tests were carried out on local full-scale models to verify the feasibility of POSUCD. The results show that the prefabricated UHPC layer reduces the maximum static compressive stress of the steel deck in the girder system by 21%, and the stress ranges at fatigue-prone details of the steel deck are decreased by 28%–90% compared to traditional OSDs with asphalt overlay. Since the prefabricated UHPC layer helps withstand dead axial load in the main girder, the high compressive strengths of UHPC can be utilized more effectively than in deck systems with UHPC only used as a cast-in-situ overlay to resist vehicular wheel loads. The transverse wet joint interfaces were identified as the weakest aspect of the POSUCD, whether under tension or compression; however, their nominal flexural strengths along the longitudinal direction meet the required design standards. The shear resistance of NPBLs was also well confirmed by the minimal interfacial slip on the specimen when it reached the ultimate capacity under positive bending moment.

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Section: Design Aspectsmentioning

confidence: 99%