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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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)
to the ground
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
Caissons are filled with high
Assume soil bearing capacity to be 3000 psf
Size the footing
Oct. 2, 2008
beam to column
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
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
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
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
Floor decking ( + concrete slab)
Composite decking (+ concrete slab)
Roof decking ( + insulation)
of metal deck
to structure below
edge angles to
retain concrete pour
welded thru deck
to beam below
composite deck/beam construction
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
3” Typical dimension between two steel beams to create a level floor surface
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”)
tension control bolts
Moment Connection - Welded
Three Building Stabilization Methods
against lateral forces of wind and earthquakes
Be aware of:
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
Key words cold formed steel framing
light gauge steel framing
Web sites: dietrichindustries.com
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.