Folded plate roof
Stabilizing Suspension Stabilizing
Compression
ring
Tension
ring
Clerestory
truss
Inner compression ring
Inner tension ring
truss
cables
cables
Columns
Cross section
four 1 in. cables, held in circular shape by the pull of the cables and stiffened by a steel H-section that runs around the full perimeter. The roof cables are connected to the ring by anchor plates of % in. steel, stif- fened by gussets that are 2 ft. deep and 9 in. wide.
Anchorages throughout the stadium have a zinc-filled socket to reinforce the regular wedged connection as a safeguard against cable slippage.
The ring, or clerestory, truss above the tension ring is made of 4 and 6 in. diameter carbon steel pipe sections. The 100 ft. diameter area is spanned by 48 pairs of 5/16 in. cables, run- ning to a 6 ft. diameter tension ring.
The inner roof uses a single layer of cables stiffened with vibration-damping trusses of angles and channels.
Drainage
Two pipe bridges tap the bowl- shaped inner roof to drain storm water. The pipes carry it to the outer roof where it drains by gravity. Water escapes through holes cast in the columns.
The roof is designed to move up to 2 in. downward and as much as 1 in. laterally during tropical down- pours. It will withstand 100 m.p.h. winds and an 8 in. per hour rainfall.
The clerestory truss is flexibly
mounted with pins and rockers so that it is unaffected by movement of the roof elsewhere. Pipe bridges are designed as cantilevers to avoid any structural tie between the inner and outer roof.
The roof sheets drain into inde- pendently mounted troughs, the de- vice that allows the deck plate to ad- just to roof movement.
In addition to the lightweight roof system, the stadium's two floors are prestressed with a series of concen- tric. post-tensioned rings. These eliminate expansion joints. even though the stadium is a massive con- crete structure with a perimeter of 1,000 ft.
F
Main entrance. Restaurant patio on left
Far East Architect & Builder May, 1967
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