Standard for Fire Safety in Rapid Transit Systems - Singapore Civil ...

APPENDIX C - continued
PART V : STRUCTURAL STEEL
A. Encased steel stanchions (Mass per metre not less than 45 Kg)
A. SOLID PROTECTION *
(unplastered)
Construction and materials
1. Concrete not leaner than 1:2:4 mix with natural aggregates-
(a) concrete not assumed to be load-bearing reinforced +
(b) concrete assumed to be load-bearing, reinforced in accordance with BS 5950: Part 8
Minimum thickness
(in mm) of protection
for a fire resistance of
4
hours
2
hours
2. Solid bricks of clay, composition or sand-lime 100 50 50
3. Solid blocks of foamed slag or pumice concrete reinforced + in every horizontal joint 75 50 50
4. Sprayed vermiculite-cement - 38 19
B. HOLLOW PROTECTION ++
1. Solid bricks of clay, composition or sand-lime reinforced in every horizontal joint, unplastered 115 50 50
2. Solid blocks of foamed slag or pumice concrete reinforced + in every horizontal joint, unplastered 75 50 50
3. Metal lathing with gypsum or cement-lime plaster of thickness of- - 38 § 19
4. (a) Metal lathing with vermiculite-gypsum or perlite-gypsum plaster of thickness of
(b) Metal lathing spaced 25mm from flanges with vermiculite-gypsum or perlite-gypsum
plaster of thickness of
5. Gypsum plasterboard with 1.6mm wire binding at 100mm pitch -
(a) 9.5mm Plasterboard with gypsum plaster of thickness of
(b) 19mm Plasterboard with gypsum plaster of thickness of
6. Gypsum plasterboard with 1.6mm wire binding at 100mm pitch-
(a) 9.5mm plasterboard with vermiculite-gypsum plaster of thickness of
(b) 19mm plasterboard with vermiculite- gypsum plaster of thickness of
7. Vermiculite - cement slabs of 4:1 mix reinforced with wire mesh and finished with
plaster skim. Slabs of thickness of
* Solid protection means a casing which is bedded close to the steel without intervening cavities and with all joints in that
casing made full and solid.
+ Reinforcement shall consist of steel binding wire not less than 2.3mm in thickness, or a steel mesh weighing not less than
0.48 kg/m 2 . In concrete protection, the spacing of that reinforcement shall not exceed 150mm in any direction.
++ Hollow protection means that there is a void between the protective material and the steel. All hollow protection to columns
shall be effectively sealed at each floor level.
§ Light mesh reinforcement required 12.5mm to 19mm below surface unless special corner beads are used.
Standard for Fire Safety in Rapid Transit Systems C-7
50
75
50 §
44
-
-
-
38 §
63
25
50
19
19
-
12.5
16
20
25
1
hour
25
50
12.5
12.5
12.5
7
10
10
25