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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
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.
slide2

Structural Order

  • Benefits of ordering system
  • Grids
    • Simplify layout
    • increases repetitive elements
  • Structural hierarchy
    • Primary: beams, columns
    • Secondary: joists
    • Tertiary: decking
slide3

Grids

    • Simplify layout
    • increases repetitive elements
  • Structural hierarchy
    • Primary: beams, columns
    • Secondary: joists
    • Tertiary: decking
slide5

SECONDARY

PRIMARY

slide8

primary frame assembly

    • - column to footing
    • - beam to column
    • - beam to beam
slide11

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)

slide15

Soil Analysis

  • Bearing capacity
  • Water table
  • Rock
slide16

Foundation Systems

  • Function of systems
  • Soil bearing capacity
  • Types of systems
  • Construction process
slide17

Foundation systems

transfer

frame loads

to the ground

slide18

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 ‘
slide19

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

slide22

30’x30’ grid with a total load of 40 lbs. per sq. ft.

Assume soil bearing capacity to be 3000 psf

Size the footing

slide24

Columns

    • Primary: beams, columns
    • Secondary: joists
    • Tertiary: decking
  • Column shapes
  • Base connection
  • Column splicing
tuesday october 7 last day to withdraw
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
slide35

Beams- Primary Members

    • Primary: beams, columns
    • Secondary: joists
    • Tertiary: decking
slide42

smaller beam insert

beam to column

moment connection

steel joists text page 377 380
Steel JoistsText: page 377-380
  • Structural hierarchy
    • Primary: beams, columns
    • Secondary: joists
    • Tertiary: decking
slide44

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
slide46

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.

slide47

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.

slide49

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

slide50

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

slide57

Steel Decking

Floor decking ( + concrete slab)

Composite decking (+ concrete slab)

Roof decking ( + insulation)

slide61

Puddle welding

of metal deck

to structure below

edge angles to

retain concrete pour

slide65

shear studs

welded thru deck

to beam below

composite deck/beam construction

slide66

shear stud

welded to beam

electric welding gun

to attach shear studs

to beam below

composite deck/beam construction

to create strong shear connection between concrete slab and beam below deck

slide70

Steel Structure Rules of Thumb

Steel beam depth = 1/20 of span (width usually 1/3 to 1/2 of depth)

Steel girder depth = 1/15 of span (width usually 1/3 to 1/2 of depth)

Triangular steel roof trusses depth = 1/4 to 1/5 of span.

Rectangular trusses depth = 1/8 to 1/12 of span.

Open-web steel joists depth = 1/20 of span for heavily loaded floors or widely spaced joists.

depth =1/24 span for lightly loaded floors, closely spaced joists and roofs.

Typical joist spacing range 2’ - 10’

Steel column Add up the total roof and floor area supported by the column. A W8 supports up to 3000 sq ft. W14 25000 sq ft.

Corrugated steel roof decking depth of = 1/40 of the span

(standard depth = 1”, 1 ½”, 2” and 4”)

steel connections
Steel Connections
  • welding
  • bolting
  • riveting
slide75

Bolting

3

1

2

load indicator

washers

tension control bolts

slide79

Shear Connection - Bolted

Moment Connection - Welded

slide80

1

3.1

Three Building Stabilization Methods

against lateral forces of wind and earthquakes

2

3.2

summary
Summary

Be aware of:

  • Concerns that require sub-surface investigation
  • Reasons for organizing a structural frame
  • Function of foundation system / types of foundations
  • Column shapes / base and top connections
  • Beam shapes and connections
  • Bar joist configuration and terms
  • Bar joist layout and connections
  • Decking types
  • Steel Connections
thursday october 9
Thursday October 9
  • Steel; Light Gauge Steel Framing
  • Wood Solutions Fair, Thursday October 16, Cobb Galleria, Free!
    • register on web site : http://www.woodworks.org/educationTraining/southeast/newsEvents10160802.aspx
  • Steel EXAM – Thursday Oct. 23
  • Tuesday, October 28 2nd Review submittal of Learning by Observation Book
  • Field Trip Thursday Oct. 30: ReadyMix Concrete www.readymixusa.com/
light gauge steel framing1
Light Gauge Steel Framing

POSITIVES

  • Derived primarily from recycled steel
  • Easily recycled when demolished
  • Noncombustible
  • Does not warp, crook, bow
  • Not susceptible to humidity
  • No termite treatment needed
  • No decay
  • Light weight
  • Fast construction time (with skilled labor)
  • Slightly longer spans for joists and rafters

NEGATIVES

  • Reduction in wall R value (heat loss double the rate of wood)
  • Higher cost than wood framing
slide86

Methods of forming metals

  • Hot rolling structural shapes
  • Cold forming light gauge framing:
  • interior walls and partitions, suspended ceiling systems, fascias, parapets, back-up walls for exterior cladding, etc.
  • Extrusion aluminum
preliminary member sizing
Preliminary Member Sizing

Rafters (horiz. projection) 1/24 x span ie. 24’ span requires a 12” member

Floor joist 1/20 x span

Interior load bearing studs

3 5/8” studs used up to 12’

6” studs up to 21’

8” studs up to 28’

Exterior load bearing supporting exterior finish system

3 5/8” studs used up to 10’

6” studs up to 17’

8” studs up to 22’

All members usually spaced 24” o.c.

Note: many web sites have span tables

helpful web sites
Helpful Web Sites

Key words cold formed steel framing

light gauge steel framing

Web sites: dietrichindustries.com

buysuperstud.com

bmp-group.com

ryanslinks.com

tuesday october 21
Tuesday October 21
  • Wood Solutions Fair attendance
  • Drawing Lab Details
  • Steel EXAM – Thursday Oct. 23 2PM
  • Tuesday, October 282nd Review submittal of Learning by Observation Book (examples on Website)
  • Field Trip Thursday Oct. 30: Ready Mix Concrete Plant and testing lab in Woodstock, GA. (17.2 miles) Must have hard hats, long pants, closed toe work shoes. www.readymixusa.com/
  • Concrete Lab November 6
drawing lab details
Drawing Lab Details
  • Open Web Joist Framing Plans
  • Open web joist bearing on steel framing
  • Open web joist bearing on concrete wall
  • Open web joist on steel framing with concrete deck and light gauge steel framing of parapet and soffit
  • Light Gauge Steel framing roof framing (or truss) with overhang at exterior bearing wall
  • Light Gauge Steel framing at roof ridge
  • Light Gauge Steel framing at aluminum storefront head showing exterior soffit & interior ceiling
  • Composite slab/deck construction
  • Typical steel column to foundation connection
georgia pacific wood mill tour questions
Georgia-Pacific Wood Mill Tour Questions
  • What mile radius do all the trees supplying this plant come from?
  • How many acres of trees are harvested per day?
  • What is the primary species of wood used for the plywood produced in this plant?
  • How many acres of forest land does Georgia-Pacific own?
  • How many 18 wheeler flat bed trucks loaded with plywood are produced each day on average?
  • It takes ____ times the energy to produce steel than wood.
georgia pacific wood mill tour questions1
Georgia-Pacific Wood Mill Tour Questions
  • What mile radius do all the trees supplying this plant come from? 100 miles
  • How many acres of trees are harvested per day?

40 acres

  • What is the primary species of wood used for the plywood produced in this plant? Southern Yellow Pine
  • How many acres of forest land does Georgia-Pacific own?

zero

  • How many 18 wheeler flat bed trucks loaded with plywood are produced each day on average? 24 ( one per hour)
  • It takes _24___ times the energy to produce steel than wood.
slide136

concrete encasement

cladding

cladding

spray on

encasement

Fireproofing Columns

slide138

Applying fireproofing

  • To structural frame
  • Two basic types of
  • Spray applied
  • Fireproofing:
  • Cement base
  • Fiber base
  • Note overspray
slide139

Due next Tuesday

Learning by Observation Submission

Journal Evaluation and Grading Criteria

Number of sites visited

Quality and number of analytical sketches and diagrams

Quality and number of measured drawings and diagrams

Quality and number of photographs

Significance of documentation to learning experience

Additional documentation and efforts that enhances the overall Journal presentation: Technical supportdata: Materials/product literature or samples from Sweets, product sources/web sites; Lowe’s, Home Depot, etc.

A grade of “C” shall be awarded for work and Journals that meet the stated “minimum” requirements.

Work and Journals that “exceed minimum” expectations shall be evaluated and awarded higher grades.

Work and Journals that fall below minimum expectations shall receive lower grade evaluations.