Flexural behavior of prefabricated high-strength steel-concrete composite beams with steel block connectors. (October 2022)

• Record Type: Journal Article
• Authors: Xiong, Gang; Li, Wei; Wang, Xuanding; Liu, Jiepeng; Bai, Yongtao; Chen, Y. Frank
• Is Part Of: Journal of constructional steel research. Volume 197(2022)
• Publication Date: 2022-10
• Subjects: High-strength steel (HSS) -- Steel-concrete composite beam (SCCB) -- Flexural behavior -- Steel block shear connector (SBSC) -- Partial shear connection; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2022.107507
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: To study the flexural behavior of high-strength steel-precast concrete slab (HSS-PCS) composite beams with steel block shear connectors (SBSCs), seven HSS-PCS beam specimens subjected to a single concentrated load were tested, considering the parameters of concrete strength, steel strength, and shear connection degree. Through this experiment, the primary specimen information of vertical load, deflection, mid-span section strain, and interface slip were established. The HSS-PCS composite beam with steel block shear connectors has good overall working performance with high bending capacity and stiffness, and three failure modes are recorded including cracking at the tongue and groove joints, crushing of mid-span concrete slab, and failure of shear connections. The composite beams show a high degree of brittleness under these three failure modes, which should be considered in practical design. The existing design theory and standards are generally suitable for predicting the bending capacities of the novel prefabricated composite beams, in which the Eurocode 4 is slightly conservative, while the Chinese design specification has relatively good prediction results for the composite beams with partial shear connections. Highlights: Seven fabricated HHS-PCS CBs with the plastic neutral axis in the steel beam section are tested under single-point loading. The composite actions between the HSS beam and the PCS are effectively achieved by the SBSCs with HSS fiber concrete grout. The HSS-PCS composite beams with SBSCs have high bending capacities, showing good application potential in bridge girders. The existing design theories and standards are assessed for predicting the bending capacities of the novel composite beams.