FROM PL LEV
2013 P. LEY
19 THE PL LEK
TERAL AL LEV
REF. LEX
48310 PL LING,
LECTII I. LAYİ
Section
11
SHAFT
1
OFFICE
H
STUBAS
ROAD
working platform and loading plat-
form were all carried on 58 three-ton jacks and an extra four six-ton jacks were installed to lift an 11-ton crane on the same hydraulic system.
The feasibility of different framing arrangements for a typical floor was investigated. The diagrid was selected as it distributed the loads more evenly all around the perimeter, which was desirable from an architectural point of view and at the same time provided a stiff floor at a favourable cost.
Diagonal ribs
While this slab could have been designed in reinforced concrete, the high percentage of reinforcement, par- ticularly the compression steel, would have made the placing of concrete extremely difficult. The post-tensioned diagrid avoids deflections due to live load and creep.
The slab consists of 21 in. deep and 8 in. wide ribs at 4 ft. 9 in. centres, run- ning diagonally in both directions and is designed for a dead load of 130 lb. per sq. ft. and a live load of 100 lb. per sq. ft., including partitions and false ceiling, making a total of 230 lb. per
sq. ft.
.
The spacing of the ribs is governed by the mullion spacing of 6 ft. 9 in. and
LIFT
Parking levels below Stubbs Road
22
་་་་
Lm
Far East BUILDER, February 1969