12 a beam connections
TRANSCRIPT
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Beam
Connections
Beam to Post &
Post to BaseDetails
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Beam Connections
Beam connectionsinvolve a condition
where a uniformly
distributed load isconcentrated through a
beam/column
condition, then to apad of concrete (FTG)
& subsequently
distributed to the
ground
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Factors Influencing Beam Connections
Weight (LL & DL)most important
based on tributary area
& loadWind Loads
Seismic Loads
Snow LoadsMaterial Type
wood, steel, masonry
length influences bendingBENDING
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Hole Placement for Columns/Beams
Distance Equals:
7 x diameter
to end4 x diameter
to edge
4 x diameter
between holes
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Maximum Hole Size for Beams
Maximum Hole Size Equals= 1/5 width or
height of beam
X width or height of beam
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Uplift
Any overhang (including an open garage) is subject
to UPLIFTfrom the windcant rely on weight of structure alone to hold in place
To preventUPLIFT:
metal post capsand metal post base Post capmeans to bolt beam to column
Post basemeans to bolt column to footing in ground
hurricane clips and seismic ties
metal angles to attach truss/rafter to wall framing
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Post Caps
Used to connect or provide a transition of loads
between columns and beams
Engineered to withstand uplift and lateral forces
forces or loads are measured in KIPS= 1000 lbs
Three structural divisions of post caps (metal
gauge of caps are different, designs similar)
1) heavy weight
2) medium
3) lightweight
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Beam Conditions and
Post Cap Designs
Connection 1--Beam at end or corner
Connection 2--Continuous beamConnection 3--Spliced beam
Connection 4--Four-way beamintersection
Connection 5--Tee and Ell brackets
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Common Post Caps (Connection 1)
Beam at end or corner
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Common Post Caps (Connection 2)
Continuous beam
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Common Post Caps (Connection 3)
Spliced beam
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Common Post Caps (Connection 4)
4-way beam intersection
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Common Post Caps (Connection 5)
Tees & Ells brackets
Connection types
continuous, splice, end
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Post Bases
Used to connect posts to the concrete base
below
Usually metalA wide variety of types
Selection depends upon
1) Size and material of column2) Environment (dry or wet)
3) Weight or loads upon column
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Post Connections and
Post Base Designs
Connection 1--Pocket design, welded plates
and angles
Simple post base
Connection 2--Angle straps with shear
plates
Connection 3--U shaped anchor strapConnection 4--Clip angles
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Common Post Bases (Connection 1)
Pocket design,
Simple Post Base
welded steel plates
column inside
preset anchor bolts
vent for moisture
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Common Post Bases (Connection 2)
Angle Strap with
Shear Plates
shear plates
prevent splitting
bearing plate
metal straps
anchor bolts
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Common Post Bases (Connection 3)
Anchor strapU-shape
preset in concrete
most common
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Common Post Bases (Connection 4)
Clip angles
and bearing
plate
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Additional Post Base Connections
Adjustable Elevated Heavy Section
D ili
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Detailing
Beam/Column/Footing Connections
Detailer must knowsize of beam
size of column/post
type of post capsize/number/location of bolts
Material type
wood, steel, concrete, or masonry
Height of column
Type of post base
Soil bearing capacity
Footing size
D ili
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Detailing
Beam/Column/Footing Connections
Standard Tables or Manufacturers are
literature used to find acceptable load vs
column height
Examples:
Height Size Loads4 4x4 14,700 lb
8 4x4 8,304 lb
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Pipe Column
Commonly used to supportbeams
May be fixed length oradjustable
Cap & Bearing plate usuallyare welded to pipe column
Attach to footing pedestal via
anchor boltsDry Pack
moist cement between bearingplate & footing pedestal to
assure perpendicularity
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Pipe Column Callout
3 PIPE COLUMN
7.58#, meaning:
3 = nominal pipe
diameter
7.58# = weight/foot
a 6 ft length would
weigh 45.48 lbs andwould carry 38 kips
(see table pg 411)
Old Notation
New Notation3 x 7.58 PIPE COLUMN
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Masonry Columns
Used in same manner as wood/steel columnsDesign Rules
unsupported, reinforced masonry columns not to excee
10 times smallest cross-sectional dimensionhollow unsupported masonry columns not to exceed 4
times smallest cross-sectional dimension
joints should lap normally, no vertical jointsExamples: 16x16reinforced column max height =
10 x 16 =13.3 ft
24x24 hollow column max height = 4 x 2 = 8 ft
(10 x 16 = 160/12 = 13.3ft)
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Masonry Columns
Note steel saddle
to connect beam to
concrete
Reinforcing &
grout in cavity
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Pilaster
A column
built into
masonry wall
for beam
support
used to give
lateral support
to wall
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ASSIGNMENTDevelop the following details for sheet S-3 1/S-3 wall to truss connection (use a simpson H1 anchor)
2/S-3 shear wall detail (1/2 plywd on 1 side of prefab truss
and interior shear wall, be sure that the truss is directly over theshear wall
3/S-3 2x6 block between trusses at walls
4/S-3 Simpson strap LSTA24 each side of ridge on 5/8 gyp
brd w/ 20 ga sht mtl 8on 8 off ridge use (2) rows 6d nails 5o.c.
5/S-3 Use a simpson strap LSTA24 on each side
D f i E i
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Drafting Exercise
Pipe Column Detail
Change pipe column callout tonew notation
3X 7.58 PIPE COLUMN
Add callout for rebar in footing2-#4 REBAR EACH WAY
Add 3/4 fiber expansion board
between concrete walk andfooting pedestal
Scales as shown in text
Pipe Column to Beam Detail