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Hollywood Bowl
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The new acoustic canopy measures some 78 feet by 68 feet and is supported at a 10 degree angle below the main roof structure by inclined tubular steel struts. The principal components of the canopy are an elliptical perimeter ladder truss with integral catwalk, 4 cross stage triangular trusses which support 28 acoustic panels and 3 lighting battens.

The perimeter truss has curved 6" square aluminum chords with 3" diagonals and 6" x 3" vertical members onto which ribbed plates are bolted to form the supports for a continuous open grid aluminum catwalk. These ribs are formed from aluminum plate that was water jet cut to the correct profile and provide support for the curved fiber glass panels which cover the underside of the ellipse.

The side sections of the perimeter truss and can be lowered to stage level to allow conventional lighting grids to be rigged from the points provided on the steel arch trusses of the main roof structure. In contrast, the front and rear sections are permanently fixed to the main roof structure with large tubular steel struts.

Four large triangular trusses span between elements of the perimeter truss and carry the main hinged acoustic panels. These panels are fabricated with aluminum ribs which support matte Makrolon panels on one side and can be deployed at various angles using remote controlled linear actuators. The trusses comprise 4" square aluminum chords with 2" square secondary members and the end sections are designed to hinge down, so that the truss better fits the profile of the domed main roof structure when it is raised into its storage position.

Three ladder truss lighting battens span between sections of the perimeter truss. Again, the chords are 4" square aluminum with 2" diagonals with galvanized steel lighting bars supported from the bottom chord. The battens can also be raised above the perimeter ring truss and stored high into the main roof structure.

The interaction of the main roof structure and the acoustic canopy presented a number of interesting structural engineering problems particularly when seismic and wind forces were considered.

Hollywood Bowl

Hollywood Bowl

Hollywood Bowl

Hollywood Bowl

Hollywood Bowl

Hollywood Bowl
 
 
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