12 a beam connections

8/12/2019 12 a Beam Connections

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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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Continuous beam


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Spliced beam


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4-way beam intersection


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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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Angle Strap with

Shear Plates

shear plates

prevent splitting

bearing plate

metal straps

anchor bolts


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Anchor strapU-shape

preset in concrete

most common


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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

12 a beam connections

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