Flexural and longitudinal shear performance of precast lightweight steel-ultra-high performance concrete composite beam

In this study, the flexural and longitudinal shear performances of two types of precast lightweight steel-ultra-high performance concrete (UHPC) composite beams are investigated, where a cluster UHPC slab (CUS) and a normal UHPC slab (NUS) are connected to a steel beam using headed studs through dis...

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Bibliographic Details
Published in:Frontiers of Structural and Civil Engineering 2023-05, Vol.17 (5), p.704-721
Main Authors: MO, Ze, QIU, Jiangrui, XU, Hanbin, XU, Lanlan, HU, Yuqing
Format: Article
Language:English
Subjects:
Bearing capacity
Cities
Civil Engineering
Composite beams
Composite materials
Compressive strength
Countries
Design optimization
Design parameters
Engineering
flexural performance
Lightweight
longitudinal shear performance
Parametric statistics
parametric study
precast steel-UHPC composite beam
Regions
Reinforcement
Research Article
Shear forces
Steel
Steel beams
Steel fibers
Stiffness
Studs
transverse reinforcement ratio
Ultra high performance concrete
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Summary:In this study, the flexural and longitudinal shear performances of two types of precast lightweight steel-ultra-high performance concrete (UHPC) composite beams are investigated, where a cluster UHPC slab (CUS) and a normal UHPC slab (NUS) are connected to a steel beam using headed studs through discontinuous shear pockets and full-length shear pockets, respectively. Results show that the longitudinal shear force of the CUS is greater than that of the NUS, whereas the interfacial slip of the former is smaller. Owing to its better integrity, the CUS exhibits greater flexural stiffness and a higher ultimate bearing capacity than the NUS. To further optimize the design parameters of the CUS, a parametric study is conducted to investigate their effects on the flexural and longitudinal shear performances. The square shear pocket is shown to be more applicable for the CUS, as the optimal spacing between two shear pockets is 650 mm. Moreover, a design method for transverse reinforcement is proposed; the transverse reinforcement is used to withstand the splitting force caused by studs in the shear pocket and prevent the UHPC slab from cracking. According to calculation results, the transverse reinforcement can be canceled when the compressive strength of UHPC is 150 MPa and the volume fraction of steel fiber exceeds 2.0%.
ISSN:2095-2430
2095-2449
DOI:10.1007/s11709-023-0941-6