I read the article about the construction of a new building at 20-32 Baker Street with some interest (NCE 14 March). From the artist's impression it would appear that the building will be five storeys.
In that case, the design should comply with Building Regulation A3 (Disproportionate Collapse).
From the detail it appears that the beam ends are carried by a thin steel pivot. If the brickwork supporting the 'doughnut' arrangement were to be blasted away in the event of an explosion, what is to prevent the side of the building from being dislodged?
Martin Redston, 4 Edward Square, London N1 0SP