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• Steel is prefabricated

Shop-Fabricated Pieces

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• Steel is prefabricated• Welded plates,

connection angles, and holes are done in a shop.

Shop-Fabricated Pieces

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• Steel is prefabricated

Steel Erection

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• Steel is prefabricated

Steel Erection

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• Steel is prefabricated• The steel erector’s job

is simple: lift and bolt

Steel Erection

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• Steel is prefabricated• The steel erector’s job

is simple: lift and bolt

Steel Erection

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• Steel is prefabricated• The steel erector’s job

is simple: lift and bolt

Steel Erection

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• Steel is prefabricated• The steel erector’s job

is simple: lift and bolt• Simple

Steel Erection

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Tension Members in Truss (but BOLTS IN SHEAR)

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

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ASTM Bolt Types

(AISC & NISD 2000)

• A307 – Low carbon steel – “Home Depot Bolt” Silver color Not commonly used

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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

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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

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ASTM Bolt Types

(AISC & NISD 2000)

• A307 – Low carbon steel – “Home Depot Bolt” Fnt = 45 ksi

Group A (incl. A325) – High-strength medium carbon steel (above left) Fnt = 90 ksi

• Group B (incl. A490) – High-strength heat treated steel (above right) Fnt = 113 ksi

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• A325 and A490 bolts: ½”, 5/8”, ¾”, 7/8”, 1”, 1-1/8”

Common Bolt Sizes

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• A325 and A490 bolts: ½”, 5/8”, ¾”, 7/8”, 1”, 1-1/8”

Common Bolt Sizes

Most Common

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Hole Types

• Std = 1/16” big

• O’size = 3/16” big

• Short Slot

• Long Slot