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2 Steel is prefabricated Shop-Fabricated Pieces

3 Steel is prefabricated Welded plates, connection angles, and holes are done in a shop. Shop-Fabricated Pieces

4 Steel is prefabricated Steel Erection

5 Steel is prefabricated Steel Erection

6 Steel is prefabricated The steel erector’s job is simple: lift and bolt Steel Erection

7 Steel is prefabricated The steel erector’s job is simple: lift and bolt Steel Erection

8 Steel is prefabricated The steel erector’s job is simple: lift and bolt Steel Erection

9 Steel is prefabricated The steel erector’s job is simple: lift and bolt Simple Steel Erection

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11 Tension Members in Truss (but BOLTS IN SHEAR)

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14 Bolted Moment Connections (we DO NOT WANT BOLTS TO EVEN SLIP!!)

15 ASTM Bolt Types (AISC & NISD 2000) A307 – Low carbon steel – “Home Depot Bolt”  Silver color  Not commonly used

16 ASTM Bolt Types (AISC & NISD 2000) A307 – Low carbon steel – “Home Depot Bolt”  Silver color  Not commonly used  Group A (incl. A325) – High-strength medium carbon steel (above left)  Black color  Most common bolts used in building construction Group B (incl. A490) – High-strength heat treated steel (above right)  Cost more than A325’s, but are stronger so fewer bolts may be necessary

17 ASTM Bolt Types (AISC & NISD 2000) A307 – Low carbon steel – “Home Depot Bolt”  Silver color  Not commonly used  Group A (incl. A325) – High-strength medium carbon steel (above left)  Black color  Most common bolts used in building construction Group B (incl. A490) – High-strength heat treated steel (above right)  Cost more than A325’s, but are stronger so fewer bolts may be necessary

18 ASTM Bolt Types (AISC & NISD 2000) A307 – Low carbon steel – “Home Depot Bolt”  F nt = 45 ksi  Group A (incl. A325) – High-strength medium carbon steel (above left)  F nt = 90 ksi Group B (incl. A490) – High-strength heat treated steel (above right)  F nt = 113 ksi

19 A325 and A490 bolts: ½”, 5/8”, ¾”, 7/8”, 1”, 1-1/8” Common Bolt Sizes

20 A325 and A490 bolts: ½”, 5/8”, ¾”, 7/8”, 1”, 1-1/8” Common Bolt Sizes Most Common

21 Hole Types Std = 1/16” big O’size = 3/16” big Short Slot Long Slot