# Tying systems: the minimum force on an internal beam line - the values of `q`_{3} and `Q`_{4}

_{3}

_{4}

## Eurocode 2 part 1-1: Design of concrete structures 9.10.2.3 (4)

In floors without screeds where ties cannot be distributed across the span direction, the transverse ties may be grouped along the beam lines. In this case the minimum force on an internal beam line is:

F = _{tie}q⋅(_{3}l + _{1}l) ≥ _{2}Q_{4} | (9.16) |

where:

`l`,_{1}`l`_{2}- are the span lengths (in [m]) of the floor slabs on either side of the beam.

## Recommendation

The recommended value of `q _{3}` is 20 kN/m and of

`Q`is 70 kN.

_{4}