At right is the stair plan & section of the 1st-2nd floor stairway in the Northwest corner of Bishop Favrao Hall.
The stair structure itself is primarily steel, with concrete treads. Supporting the concrete landing and steel pan is a steel channel running perpendicular to the stair, and a small steel angle running parallel to the stair. The steel stringers extend to the cmu walls on the top and bottom of the stairs. The concrete treads are supported by a "Z" shape steel pre-fabricated tread. In turn, the same pre-fabricated treads are supported at either end by a steel strap welded to the stringer and bottom of the treads.
An assumption was made as to how the bottom concrete landing is supported, but in this sketch, the slab/steel pan is supported by an angle welded to a channel at the stair end, and by a channel bearing on the cmu wall (at either end of the channel).
Above the stairs is a handrail supported at 5 places. Also shown is a sprinkler system pipe.
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