Structure: Approved Document A

REDUCING THEO SNENLSITIIVNITEY O FV TEHER BSUILIDOINNG TO A3 DISPROPORTIONATE COLLAPSE IN THE EVENT OF AN ACCIDENT BS EN 1999-1-1:2007+A1:2009 Eurocode − in the case of an internal masonry wall, 9: Design of aluminium structures – Part 1.1: or timber or steel stud wall, a length not General structural rules; with UK National Annex exceeding 2.25H, to BS EN 1999-1-1:2007+A1:2009 and where H is the storey height in metres. BSI PD 6702-1:2009 Note: Annex A of BS EN 1991-1-7:2006 with 5.3 Definitions its UK National Annex provides corresponding guidance. Nominal length of load-bearing wall The nominal length of load-bearing wall key elements construction referred to in 5.1d should be taken A ‘key element’, as referred to in paragraph 5.1d, as follows: should be capable of sustaining an accidental − i n the case of a reinforced concrete wall, the design loading of 34kN/m2 applied in the horizontal and vertical directions (in one direction distance between lateral supports subject to at a time) to the member and any attached a maximum length not exceeding 2.25H, components (e.g. cladding etc.) having regard to − i n the case of an external masonry wall, the ultimate strength of such components and or timber or steel stud wall, the length their connections. Such accidental design loading measured between vertical lateral supports, should be assumed to act simultaneously with all other design loadings (i.e. wind and imposed loading) in accidental actions loading combination. Table 11 B uilding consequence classes Consequence Classes Building type and occupancy 1 Houses not exceeding 4 storeys Agricultural buildings B uildings into which people rarely go, provided no part of the building is closer to another building, or area where people do go, than a distance of 1.5 times the building height 2a Lower Risk Group 5 storey single occupancy houses Hotels not exceeding 4 storeys Flats, apartments and other residential buildings not exceeding 4 storeys Offices not exceeding 4 storeys Industrial buildings not exceeding 3 storeys Retailing premises not exceeding 3 storeys of less than 2000m² floor area in each storey Single-storey educational buildings A ll buildings not exceeding 2 storeys to which members of the public are admitted and which contain floor areas not exceeding 2000m² at each storey 2b Upper Risk Group Hotels, blocks of flats, apartments and other residential buildings greater than 4 storeys but not exceeding 15 storeys Educational buildings greater than 1 storey but not exceeding 15 storeys Retailing premises greater than 3 storeys but not exceeding 15 storeys Hospitals not exceeding 3 storeys Offices greater than 4 storeys but not exceeding 15 storeys A ll buildings to which members of the public are admitted which contain floor areas exceeding 2000m² but less than 5000m² at each storey Car parking not exceeding 6 storeys 3 A ll buildings defined above as Consequence Class 2a and 2b that exceed the limits on area and/or number of storeys Grandstands accommodating more than 5000 spectators Buildings containing hazardous substances and/or processes Notes: 1. For buildings intended for more than one type of use the Consequence Class should be that pertaining to the most onerous type. 2. In determining the number of storeys in a building, basement storeys may be excluded provided such basement storeys fulfil the robustness requirements of Consequence Class 2b buildings. 3. BS EN 1991-1-7:2006 with its UK National Annex also provides guidance that is comparable to Table 11. Structure Approved Document A 44 O N L I N E V E R S I O N