SELECTING and SPECIFYING - AISC

SELECTING . and SPECIFYING . Wesley B. Myers, An insider's guide to SELECTING and SPECIFYING K-series, LH, DLH-series joists and joist girders S. ince the Steel Joist Institute based on L/360 allowable deflection, double KCS joists can be used, or an adopted the first standard erection stability bridging require- LH-series joist can be selected. specification and first load ments and approximate joist weight. It table in 1928 and 1929, respec- also includes the K-series economy LH AND DLH JOISTS. tively, the building designer table so the lightest joist for a given The second series, the Long Span has been able to specify standard joist load can easily be selected. The ends of and Deep Long Span steel joist or the designations rather than design each K-series joists must extend at least 2 LH and DLH series, is defined as sim- structural component of each steel over steel supports (see Figure 2).

SELECTING Modern Steel Construction • April 2002 S ince the Steel Joist Institute adopted the first standard specification and first load table in 1928 and 1929, respec-tively, the building designer has been able to specify standard joist designations rather than design each structural component of each steel truss. The current Steel Joist ...

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