EK665

For buildings in consequence class 1, no further consideration for robustness is necessary provided that the building has been designed adequately against normal use. For lower class 2 buildings additional
horizontal ties or anchorage floors to walls should be provided. In the upper-class vertical ties should also be added. The building should also be checked so that the removal of any supporting column, beam
supporting a column or wall does not result in an unstable structure or that local damage is not above limits. If the removal leads to failure the individual element need to be designed to resist any relevant
accidental load. In the case of a class 3 building, a risk assessment must be made to take both expected and not expected risks into account.