| CNA | coarse natural aggregates |
| CNC | computer numerical control |
| CRA | coarse recycled aggregates |
| CSC | corrugated-strip connectors |
| D | bolts’ diameter |
| DSC | double skin composite |
| LWC | lightweight concrete |
| N | normal strength concrete |
| NWC | normal weight concrete |
| P | external shear force |
| Pu | ultimate shear capacity of the connector |
| RC | reinforced concrete |
| S | bolts’ spacing |
| SF | steel fibres |
| SCS | steel-concrete-steel |
| SFC | steel fibres concrete |
| T | concrete core’s thickness |
| δ | slip induced by the applied load |