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

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Frontiers of Structural and Civil Engineering 2023年第5期17卷 704-721页

作者： Ze MO Jiangrui QIU Hanbin XU Lanlan XU Yuqing HU Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education School of Civil EngineeringSoutheast UniversityNanjing 211189China College of Civil and Transportation Engineering Hohai UniversityNanjing 210024China School of Civil Engineering Jiangsu Open UniversityNanjing 210036China

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,*** show that the longitudinal shear force of the CUS is greater than that of the NUS,whereas the interfacial slip of the former is *** to its better integrity,the CUS exhibits greater flexural stiffness and a higher ultimate bearing capacity than the *** further optimize the design parameters of the CUS,a parametric study is conducted to investigate their effects on the flexural and longitudinal shear *** square shear pocket is shown to be more applicable for the CUS,as the optimal spacing between two shear pockets is 650 ***,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 *** 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%.

关键词： precast steel-UHPC composite beam flexural performance longitudinal shear performance parametric study transverse reinforcement ratio

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