# Limit span/depth ratio for omitting the deflection calculations: the structural system factor `K`

## Eurocode 2 part 1-1: Design of concrete structures 7.4.2 (2)

The limit span/depth ratio may be estimated using Expressions (7.16.a) and (7.16.b):

if ρ ≤ ρ _{0} | (7.16.a) |

if ρ > ρ _{0} | (7.16.b) |

where `K` is the factor to take into account the different structural systems.

## Recommendation

The recommended values for the structural system factor `K` are given in Table 7.4N. The limits span/depth `l`/`d` obtained by using Expression (7.16) for common cases (C30/37, `σ _{s}` = 310 MPa, different structural systems and reinforcement ratios

`ρ`= 0,5% et ρ = 1,5%) are also given.