# Shear Resistance Assessment of the Y-Type Perfobond Rib Shear Connector under Repeated Loadings
## 2 Details of Monotonic and Repeated Loading Test Program
### Fabrication of Specimens and Material Properties  
In total, 27 specimens were fabricated for both monotonic and repeated loading tests following the standard specimen form suggested in Eurocode-4 [24]. Figure 1 shows the details of the specimen and Y-type perfobond rib shear connectors. The Y-type perfobond rib shear connectors were welded on the H-beam and embedded in the concrete block. The H-beam has a cross-section of H300 \(\times\) 300 \(\times\) 9 \(\times\) 14 mm, and the concrete block is 600 \(\times\) 750 \(\times\) 280 mm. The fabrication process is shown in Figure 2. All specimens have a 70 mm long styrofoam attached at the bottom end of the Y-type perfobond rib shear connector to remove the end-bearing effect. Additionally, grease was spread on all the interfaces of steel plate and concrete to remove the chemical bond effect before casting the concrete. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Specimen**} & \multicolumn{2}{c}{**Number of**} & \multicolumn{2}{c}{**Y-Type Perfobond Rib Shear Connector**} & \multicolumn{2}{c}{**Transverse Rebar**} & \multirow{2}{*}{**Concrete Design Strength (MPa)**} \\  & **Specimens (M/R) \(\star\)** & & \(w\) **(mm)** & \(h\) **(mm)** & \(t\) **(mm)** & **Steel Grade** & \(d_{r}\) **(mm)** & **Steel Grade** \\ \hline SD400-D16-M/R & 6 (3/3) & 80 & 100 & 10 & SM490 & 16 & SD400 & 60 \\ SD400-D19-M/R & 6 (3/3) & 80 & 100 & 10 & SM490 & 19 & SD400 & 60 \\ SD500-D16-M/R & 6 (3/3) & 80 & 100 & 10 & SM490 & 16 & SD500 & 60 \\ SD500-D19-M/R & 6 (4/2) & 80 & 100 & 10 & SM490 & 19 & SD500 & 60 \\ SD500-D22-M/R & 3 (2/1) & 80 & 100 & 10 & SM490 & 22 & SD500 & 60 \\ \hline \hline \end{tabular}  
* \(w\): width;
* \(h\): height;
* \(t\): thickness;
* \(d_{r}\): diameter of rebar,
* respective number of specimens for monotonic (M) and repeated (R) loading tests.  
\end{table} 
Table 1: Design variables of specimens. Figure 1: _Cont._  
The concrete compressive strengths were evaluated through the cylinder tests on both the 28 th day and the dates of the monotonic and repeated loading tests. All of the cylinder specimens were cured in the same conditions as the specimens. Table 2 contains the concrete strength data. In this study, 62.4 MPa was adopted as the representative concrete strength. Figure 1: Dimensions of the push-out specimen with the Y-type perfobond rib shear connector (unit: mm). (**a**) Front view, (**b**) side view, (**c**) plan view, (**d**) Y-type perfobond rib shear connector and (**e**) push-out specimen with 3D. Figure 2: _Cont._  
The steel plates and rebars were tested through the standard tensile strength tests with steel plate coupons and rebar coupons. As shown in Table 3, all coupons satisfy the Korean Standard [23] in terms of the minimum yield stress (315 MPa) and tensile strength (490 MPa) of SM490, respectively. The minimum yield strengths of SD400 coupons and SD500 coupons are over 400 and 500 MPa, respectively. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Type**} & \multicolumn{2}{c}{**28-Day**} & \multicolumn{2}{c}{**Test Date**} \\ \cline{2-5}  & **Remicon \#1** & **Remicon \#2** & **Remicon \#1** & **Remicon \#2** \\ \hline \multirow{4}{*}{Experimental data} & 62.0, 61.4, 59.7, 61.9, 58.0, 61.5 & 65.7, 65.6, 63.5, 59.5, 61.9, 64.5, 60.6 & 63.5, 58.7, 62.8, 63.0, 61.0, 66.1, 61.5, 61.8, 61.2, 59.8, 62.3, 65.0, 62.6 \\ \hline Mean & 60.8 & 62.9 & 62.2 & 62.5 \\ \hline COV & 0.013 & 0.026 & 0.015 & 0.019 \\ \hline Avg. strength & 61.8 & & 62.4 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Concrete compressive strength (unit: MPa).