New Roof for an Aging Temporary

by Ralph C. Doederlein, (M.ASCE), Consulting Engineer; D'Huy Engineering, Bethlehem, PA,


Serial Information: Civil Engineering—ASCE, 1989, Vol. 59, Issue 10, Pg. 78-80


Document Type: Feature article

Abstract:

The wartime temporary design of a 1942 industrial building justified use of green timber for its roof trusses and higher than usual allowable design stresses. Some 45 years later, a new steel roof structure was constructed without disturbing operations below. Steel trusses are supported by 8 ft steel column extensions fixed to the tops of the building's existing concrete columns. As the columns could take gravity loads only, expansion bolts were used as a pinned connection to transfer lateral wind loads. Slotted bolt connections and an expansion joint accommodated thermal differentials. The trusses, which support joists and metal decking, were placed by crane in a phased construction program. The final phase will be to remove the existing wood trusses and install a mezzanine floor.

Subject Headings: Trusses | Steel columns | Wind loads | Lateral loads | Gravity loads | Building design | Bolted connections

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