# Investigations on Interface Shear Fatigue of Semi-Precast Slabs with Lattice Girders
## 4 Fatigue Tests on Semi-Precast Slabs with Lattice Girders
### Fabrication of Test Specimens
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline
**Test** & \(h_{\text{ges}}\) & \(a\) & \(n_{\text{LG}}\) & \(f_{\text{ym,LG}}\) & \(n_{\text{l}}\) & \(f_{\text{ym,p}}\) & \(f_{\text{cm,pre}}\) & \(f_{\text{cm,in situ}}\) & **Roughness** & \(R_{\text{stand}}\) & \(R_{\text{laser}}\) \\ \cline{2-11}  & **(cm)** & **(cm)** & **(-)** & **(N/mm2)** & **(-)** & **(N/mm2)** & **(N/mm2)** & **(N/mm2)** & **(-)** & **(mm)** \\ \hline EG01 & 16 & 50 & 2 & 546 & 7 & 954 & 25.3 & 35.6 & smooth & 0.24 & 0.42 \\ \hline EG02 & 16 & 50 & 2 & 546 & 7 & 954 & 25.6 & 33.9 & very smooth 1 & 0.26 & 0.43 \\ \hline EG03 & 16 & 50 & 2 & 546 & 7 & 939 & 27.7 & 33.2 & \begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\)mm) \\ \end{tabular} & 0.64 & - \\ \hline EG04 & 16 & 50 & 3 & 546 & 7 & 939 & 27.9 & 34.0 & \begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\) mm) \\ \end{tabular} & 0.93 & - \\ \hline EG05 & 16 & 50 & 4 & 546 & 7 & 939 & 28.2 & 35.2 & \begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\) mm) \\ \end{tabular} & 0.78 & - \\ \hline EG06 & 16 & 50 & 2 & 546 & 7 & 939 & 51.1 & 61.3 & \begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\) mm) \\ \end{tabular} & 0.97 & 1.33 \\ \hline EG07 & 16 & 50 & 3 & 546 & 7 & 939 & 51.1 & 61.3 & \begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\) mm) \\ \end{tabular} & 1.01 & 1.19 \\ \hline EG08 & 16 & 50 & 4 & 546 & 7 & 939 & 51.4 & 61.3 & \begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\) mm) \\ \end{tabular} & 1.07 & 1.04 \\ \hline EG09 & 16 & 50 & 2 & 546 & 7 & 939 & 32.9 & 34.4 & \begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 1.5\) mm) \\ \end{tabular} & 2.02 & - \\ \hline EG10 & 36 & 130 & 2 & 554 & 18 & 939 & 36.0 & 32.0 & \begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\) mm) \\ \end{tabular} & 0.82 & 1.01 \\ \hline EG11 & 36 & 130 & 4 & 554 & 18 & 939 & 37.2 & 36.0 & \begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\) mm) \\ \end{tabular} & 0.78 & 0.85 \\ \hline EG12 & 36 & 130 & 2 & 554 & 18 & 939 & 48.6 & 55.6 & \begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\) mm) \\ \end{tabular} & 1.02 & 0.63 \\ \hline EG13 & 36 & 130 & 4 & 554 & 18 & 939 & 49.0 & 56.8 & \
\begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\) mm) \\ \end{tabular} & 1.19 & 1.67 \\ \hline EG14 & 33 & 120 & 4 & 554 & 17 & 939 & 31.5 & 34.8 &
\begin{tabular}{c} ‘rough’ \\ (\(R_{\text{t}}\approx 0.9\) mm) \\ \end{tabular} & 0.96 & - \\ \hline \hline \end{tabular}  
* \(h_{\text{gs}}\): overall slab height; \(a\): distance between load application and support; \(m_{\text{LC}}\): number of lattice girders; \(f_{\text{ym,loc}}\): mean yield strength of the diagonals of the lattice girders; \(n_{\text{l}}\): number of longitudinal reinforcement bars; \(f_{\text{ym,l}}\): mean yield strength of longitudinal reinforcement; \(f_{\text{cm,pre}}\): mean concrete compressive strength of precast slab; \(f_{\text{cm,in situ}}\): mean concrete compressive strength of in situ concrete; \(R_{\text{stand}}\): mean roughness depth by sand patch method; \(R_{\text{laser}}\): mean roughness depth by laser triangulation; 1: additionally weakened by formwork oil.  
\end{table} 
Table 4: Parameters and material properties of test specimens. Figure 14: Measurement instrumentation for Specim EG10: strain gauges (SG) at reinforcement and displacement transducers (W).