SCDF Travel Distance

One weekend that 

START STRATEGY 1:

1) Number of exit stairs based on occupancy load (Table 2.2A)
- do note that overall width of s/c would be based on the most stringent floor load, x. so if auditorium on L8, with the most OL, L1-L7 s/c would need to also cater of OL x, with " no reduction in width, regardless of lower stories having less number of occupants".

So highest OL function, usually on lower floors. Clause 2.2.3

Occupancy load does not include ( non-simultaneous space)
- eg corridors, pantries, lift lobbies

Capacity: Note doorway/ corridor/ staircase

2) Placement of staircase
Condition 1

- remoteness cannot be < 1/2 D, or 1/3D ( if sprinkled)

Designer thought: that means storey building with a service core in the middle is interesting to see how their staircase fulfill the 1/2 D; 1/3D or maybe that would determine the floor plate size.
Eg in a 10x10 floorplate, distance between 2 stairs, as a sprinkled building has to be at least 3m apart..

To Think: About worse case scenario for a fire, and which s/c is available to run to, and if it can take the OL

Condition 2

-travel distance ( note sprinkler protected or not) * note travel distance is to door of staircase, not door of SSL

--> if details known, measure 1 way ( measure from remote corner of partition room to center of external corridor when 2 way starts, 2 way

--> unknown 2/3 of D

Qn: Is allowable travel distance to the splitting point? 
One way is measure until : it becomes 2 way, or when it reaches the door of s/c
Two way is measure from most remote to door of s/c

START STRATEGY 2:
Depending on width of staircase given & table 2.2 A, one can estimate how many  people max for that floor plate.
Eg, for industrial purpose, for a 1m wide exit staircase,  ( based on 1 unit width is 0.5m); 1 m wide is equivalent to 2 units widths; based on table 2.2A, gives  2x60 =120 pax
Calculation example

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