Symbol Definition

Value

Symbol Definition

Value

¿c |
Cross sectional area of concrete |
bh |

¿s |
Area of tension steel | |

¿s2 |
Area of compression steel | |

¿s, prov |
Area of tension steel provided | |

¿s, req'd |
Area of tension steel required | |

b |
Width of slab | |

d |
Effective depth | |

d2 |
Effective depth to compression reinforcement | |

fcd |
Design value of concrete compressive strength |
Acc /ck/Yc |

fck |
Characteristic cylinder strength of concrete | |

fctm |
Mean value of axial tensile strength |
0.30 /ck2/3 for /ck < C50/60 (from Table 3.1, Eurocode 2) |

lh |
Slab thickness | |

K |
Factor to take account of the different structural systems |
See Table N 7.4 in UK National Annex |

l eff |
Effective span of member |
See Section 5.3.2.2 (1) |

lid |
Limiting span-to-depth ratio | |

M |
Design moment at the ULS | |

X |
Depth to neutral axis |
(d - z)/0.4 |

xmax |
Limiting value for depth to neutral axis |
(D - 0.4)d where D <1.0 |

z |
Lever arm | |

a cc |
Coefficient taking account of long term effects on compressive strength and of unfavourable effects resulting from the way load is applied |
0.85 for flexure and axial loads. 1.0 for other phenomena (From UK National Annex) |

d |
Ratio of the redistributed moment to the elastic bending moment | |

Gm |
Partial factor for material properties |
1.15 for reinforcement (ys) 1.5 for concrete (yc) |

R0 |
Reference reinforcement ratio |
R/ck/1000 |

r |
Required tension reinforcement at mid-span to resist the moment due to the design loads (or at support for cantilevers) |
As/bd |

r' |
Required compression reinforcement at mid-span to resist the moment due to the design loads (or at support for cantilevers) |
AsZ/bd |

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