Experimental study on multi-bolt shear connectors of prefabricated steel-concrete composite beams

Study on Shear Behavior of Multi-Bolt Connectors for Prefabricated Steel–Concrete Composite Beams

“…Meanwhile, the part of the bolt embedded in concrete slab (Part I) underwent obvious deformation, while the residual part (Part II) was straight besides the region near the failed shear section. The analyzed bolt shear failure mode in this study was similar to the tested failure mode in Yang et al (2020) (see Figure 6C). The red contour areas experienced more than 90% damage as for concrete slabs, while the blue contours covered all damaged compression areas.…”

“…At present, design recommendations for predicting the ultimate shear resistance (P u ) of bolt shear connectors in SCCBs have been suggested by several researchers (Kwon et al, 2010;Liu et al, 2015;Chen et al, 2019;Zhang et al, 2019;Yang et al, 2020), which are listed in Supplementary Table 3. The units for variables in the expression are N and mm.…”

“…The units for variables in the expression are N and mm. It can be seen that the calculation formulas proposed by Kwon et al (2010), Liu et al (2015), and Yang et al (2020) took the effective cross-sectional area (A sc ) and the tensile strength (f u ) of bolt connectors into consideration as the primary influence factors for shear capacity.…”

“…It was seen in comparison that the values predicted by Equation ( 6) produced more accuracy than Equation (8) on the shear capacity of the bolt connector (η = 0.155 for P u (6) /P u 0 , η = 0.220 for P u (8) /P u 0 ). Based on the parametric studies and the comparison results of aforementioned various design formulas, a modified equation considering the multiple bolts effect (α) was suggested for predicting the shear-bearing capacity per bolt connector in MBSCs, which can be expressed as: (Yang et al, 2020).…”

“…Moreover, Liu et al (2015Liu et al ( , 2016Liu et al ( , 2017 and Ataei et al (2016Ataei et al ( , 2019 studied the structural behavior of HSFGB shear connectors in prefabricated composite beams with geopolymer concrete by performing comprehensive tests and FE analysis, and the practical design recommendations were also presented for estimating the shear resistance and the loadslip response of bolted connectors. Recently, Yang et al (2020) conducted push-out tests to investigate the 16 mm multi-bolt connectors, and the results showed that, due to the multiple bolts effect, the average shear capacity per bolt in multi-bolt connectors was lower than that of the customarily arranged bolts.…”