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Tuesday Sept. 30

Tuesday Sept. 30. Steel; assemblies, foundations , columns, connections, decking Wood Solutions Fair, Thursday October 16 , Cobb Galleria, Free! register on web site : http://www.woodworks.org/educationTraining/southeast/newsEvents10160802.aspx

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Tuesday Sept. 30

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  1. Tuesday Sept. 30 • Steel; assemblies, foundations , columns, connections, decking • Wood Solutions Fair, Thursday October 16, Cobb Galleria, Free! • register on web site : http://www.woodworks.org/educationTraining/southeast/newsEvents10160802.aspx • Field Trip –Thursday Oct. 2: 12:30Bus will be in front of gym. • Georgia Pacific in Madison, GA • hard hats, eye and ear protection • clothing and shoe safety (leather shoes with rubber soles…..jeans / pants….no shorts or skirts).  Anyone with long, dangling jewelry will be asked to remove it.  Same for dreadlocks or long, loose hair.  No open-toed shoes.  Everyone must wear long pants.

  2. Structural Order • Benefits of ordering system • Grids • Simplify layout • increases repetitive elements • Structural hierarchy • Primary: beams, columns • Secondary: joists • Tertiary: decking

  3. Grids • Simplify layout • increases repetitive elements • Structural hierarchy • Primary: beams, columns • Secondary: joists • Tertiary: decking

  4. SECONDARY PRIMARY

  5. Tertiary

  6. primary frame assembly • - column to footing • - beam to column • - beam to beam

  7. Types of Steel Frame Construction AISC Type1 – rigid frame construction (shear and moment connections) AISC Type2 – simple frame construction (only shear connections) AISC Type3 – semi-rigid frame construction (shear and some moment resistance)

  8. Foundations

  9. Site Grading

  10. Soil Analysis • Bearing capacity • Water table • Rock

  11. Foundation Systems • Function of systems • Soil bearing capacity • Types of systems • Construction process

  12. Foundation systems transfer frame loads to the ground

  13. Pile foundations develop • bearing capacity by side • wall friction • They must be driven in sets • of three or more and capped • with concrete • Common pile members are • made of: • Treated wood • Steel H sections • Concrete • Typically 20 – 30 ‘

  14. Caissons are augured to depths of 50 – 60 feet and greater in search of high bearing capacity such as bedrock Diameters of 36” are common Some are sleeved to prevent cave-in Caissons are filled with high strength concrete

  15. 30’x30’ grid with a total load of 40 lbs. per sq. ft. Assume soil bearing capacity to be 3000 psf Size the footing

  16. Steel Columns

  17. Columns • Primary: beams, columns • Secondary: joists • Tertiary: decking • Column shapes • Base connection • Column splicing

  18. SteelA Kit of Shapes.

  19. Fireproofing Columns

  20. Georgia-Pacific Wood Mill Field Trip Oct. 2, 2008

  21. Tuesday October 7(last day to withdraw) • Steel; beams, web joists, decking, connections • Wood Solutions Fair, Thursday October 16, Cobb Galleria, Free! • register on web site : http://www.woodworks.org/educationTraining/southeast/newsEvents10160802.aspx • Field Trip –Thursday Oct. 30: Redeady Mix Concrete

  22. Beams- Primary Members • Primary: beams, columns • Secondary: joists • Tertiary: decking

  23. smaller beam insert beam to column moment connection

  24. Steel JoistsText: page 377-380 • Structural hierarchy • Primary: beams, columns • Secondary: joists • Tertiary: decking

  25. Open-Web Steel Joists • Small lightweight trusses • Standardized • Shop-fabricated • http://www.quincyjoist.com/ • Produced in 3 series • K-series ( most common) span up to 60’ – depth ranges from 8” to 30” • LH-series span up to 96’ – depth ranges from 18” to 48” • longspan • DLH-series span up to 144’ – depth range from 52” to 72” • deep longspan • Spacing between Open-Web Steel Joists typically ranges from 2’ to 10’. • Joist Girders: Heavier versions of steel joists that carry the loads off ends of joist framing members

  26. Open web bar joist are used as secondary framing members for floors and roof systems. Lighter roofloads allow joist to be spaced 4’ – 5’ oc. apart Floorloads – 50 –100 psf require closer spacing of 2’ oc.

  27. Joist selection Weight per linear ft. of span The TOP figures in the table give the TOTAL safe factored uniformly distributed load-carrying capacities, in pounds per linear foot. The BOTTOM figures in this load table are the unfactored nominal LIVE loads per linear foot of joist which will produce an approximate deflection of 1/360 of the span. LIVE loads which will produce a deflection of 1/240 of the span may be obtained by multiplying the BOTTOM figures by 1.5. In no case shall the TOTAL load capacity of the joists be exceeded. Where the joist span exceeds the unshaded area of the Load Table, the row of bridging nearest the mid span shall be diagonal bridging with bolted connections at the chords and intersections.

  28. HORIZONTAL BRIDGING NOTE: DO NOT WELD BRIDGING TO JOIST WEB MEMBERS. DO NOT HANG ANY MECHANICAL, ELECTRICAL, ETC. FROM BRIDGING. from Vulcraft Steel Joist Catalog www.vulcraft.com/downlds/catalogs/joistcat.pdf

  29. Bridging distributes loads across framing system and resists overturning of joist. Cross bridging is used on the end bays Horizontal bridging is used across all joists for lateral support cross bridging horizontal bridging

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