The loads given in Table 4 should be treated as the unfactored loads or characteristic loads for design purposes. The UDL (uniform distributed line load) and the uniformly distributed and concentrated loads applicable to the infill pannel are not additive and should be considered as three separate loads.
Extract from BS 6180:-
Deflection
6.4.1 Barriers for protection of people
Barriers for the protection of people should be of adequate strength and stiffness to sustain the applied loads given in BS 6399, without permanent deflection or distortion. In addition, a barrier that is structurally safe should not possess sufficient flexibility to alarm building users when subject to normal service conditions. Therefore, for serviceability considerations, the limiting condition for deflection appropriate for a horizontal displacement of the barrier at any point from its original position should not exceed the deflection limits determined from the relevant structural design code for the material used or 25mm, whichever is the smaller.
Where a glass component of a barrier is subjected to imposed loads given in BS 6399-1, or of appropriate BS 6399-2, the displacement of any point of the glass component, relative of its fixings, should not exceed L/65 or 25mm, whichever is the smaller where L is given in 8.3, 8.4 or 8.5. This is used in conjunction with BS 6399, Table 4 as below.
Type of occupancy | Examples | Horizontal uniformly distributed line load | A uniformly distributed load applied to the infill | A point load applied to part of the infill |
| A Domestic and residential activities | (i) All areas within or serving exclusively one single family dwelling including stairs, landings, etc. but excluding external balconies and edges of roofs (see C3 ix) | 0.36 | 0.5 | 0.25 |
| (ii) Other residential, (but also see C) | 0.74 | 1.0 | 0.5 | |
| B and E Offices and work areas not included elsewhere including storage areas | (iii) Light access stairs and gangways not more than 600 mm wide | 0.22 | N/A | N/A |
| (iv) Light pedestrian traffic routes in industrial and storage buildings except designated escape routes | 0.36 | 0.5 | 0.25 | |
| (v) Areas not susceptible to overcrowding in office and institutional buildings also industrial and storage buildings except as given above | 0.74 | 1.0 | 0.5 | |
| C Areas where people may congregate C1/C2 Areas with | (vi) Areas having fixed seating within 530 mm of the barrier, balustrade or parapet | 1.5 | 1.5 | 1.5 |
| (vii) Restaurants and bars | 1.5 | 1.5 | 1.5 | |
| C3 Areas without obstacles for moving people and not susceptible to overcrowding | (viii) Stairs, landings, corridors, ramps | 0.74 | 1.0 | 0.5 |
| (ix) External balconies and edges of roofs. Footways and pavements within building curtilage adjacent to basement/sunken areas | 0.74 | 1.0 | 0.5 | |
| C5 Areas susceptible to overcrowding | (x) Footways or pavements less than 3 m wide adjacent to sunken areas | 1.5 | 1.5 | 1.5 |
| (xi) Theatres, cinemas, discotheques, bars, auditoria, shopping malls, assembly areas, studio. Footways or pavements greater than 3 m wide adjacent to sunken areas | 3.0 | 1.5 | 1.5 | |
| (xii) Grandstands and stadia | See requirements of the appropriate certifying authority | |||
| D Retail areas | (xiii) All retail areas including public areas of banks/buildingsocieties or betting shops. For areas where overcrowding may occur, see C5 | 1.5 | 1.5 | 1.5 |
| F/G Vehicular | (xiv) Pedestrian areas in car parks including stairs, landings, ramps, edges or internal floors, footways, edges of roofs | 1.5 | 1.5 | 1.5 |
| (xv) Horizontal loads imposed by vehicles | See clause 11 | |||
Information taken from BS 6399 Loading for Buildings.
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