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Steel and Composite Structures
  Volume 50, Number 3, February 10 2024 , pages 319-336
DOI: https://doi.org/10.12989/scs.2024.50.3.319
 


Shear performance and design recommendations of single embedded nut bolted shear connectors in prefabricated steel–UHPC composite beams
Zhuangcheng Fang, Jinpeng Wu, Bingxiong Xian, Guifeng Zhao, Shu Fang, Yuhong Ma and Haibo Jiang

 
Abstract
    Ultra-high-performance concrete (UHPC) has attracted increasing attention in prefabricated steel–concrete composite beams as achieving the onsite construction time savings and structural performance improvement. The inferior replacement and removal efficiency of conventional prefabricated steel–UHPC composite beams (PSUCBs) has thwarted its sustainable applications because of the widely used welded-connectors. Single embedded nut bolted shear connectors (SENBs) have recently introduced as an attempt to enhance demountability of PSUCBs. An in-depth exploration of the mechanical behavior of SENBs in UHPC is necessary to evidence feasibilities of corresponding PSUCBs. However, existing research has been limited to SENB arrangement impacts and lacked considerations on SENB geometric configuration counterparts. To this end, this paper performed twenty push-out tests and theoretical analyses on the shear performance and design recommendation of SENBs. Key test parameters comprised the diameter and grade of SENBs, degree and sequence of pretension, concrete casting method and connector type. Test results indicated that both diameters and grades of bolts exerted remarkable impacts on the SENB shear performance with respect to the shear and frictional responses. Also, there was limited influence of the bolt preload degrees on the shear capacity and ductility of SENBs, but non-negligible contributions to their corresponding frictional resistance and initial shear stiffness. Moreover, inverse pretension sequences or monolithic cast slabs presented slight improvements in the ultimate shear and slip capacity. Finally, design-oriented models with higher accuracy were introduced for predictions of the ultimate shear resistance and load–slip relationship of SENBs in PSUCBs.
 
Key Words
    bolted shear connector; push-out test; shear performance; steel–UHPC composite beam; Ultra-HighPerformance Concrete (UHPC)
 
Address
Zhuangcheng Fang:1)Earthquake Engineering Research & Test Center, Guangzhou University, Guangzhou, 510006, China
2)Guangdong Key Laboratory of Earthquake Engineering & Applied Technique, Guangzhou 510006, China
3)School of Civil and Transportation Engineering, Guangdong Univ. of Technology, Guangzhou, 510006, China

Jinpeng Wu:School of Civil and Transportation Engineering, Guangdong Univ. of Technology, Guangzhou, 510006, China

Bingxiong Xian:School of Civil and Transportation Engineering, Guangdong Univ. of Technology, Guangzhou, 510006, China

Guifeng Zhao:School of Civil Engineering, Guangzhou University, Guangzhou, 510006, China

Shu Fang:Guangdong Key Laboratory of Earthquake Engineering & Applied Technique, Guangzhou 510006, China

Yuhong Ma:1)Earthquake Engineering Research & Test Center, Guangzhou University, Guangzhou, 510006, China
2)Guangdong Key Laboratory of Earthquake Engineering & Applied Technique, Guangzhou 510006, China

Haibo Jiang:School of Civil and Transportation Engineering, Guangdong Univ. of Technology, Guangzhou, 510006, China
 

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