Bracing 2004

Wind Wind Bracing Bracing Systems Systems

Wind Wind Bracing Bracing Systems Systems

HOW BRACING WORKS 1

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Wind Wind Bracing Bracing Systems Systems

Wind Wind Bracing Bracing Systems Systems

Load Dispersal

Load Dispersal

The WIND load on Endwall panels...

is dispersed through Endwall framing... 3

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Wind Wind Bracing Bracing Systems Systems

Wind Wind Bracing Bracing Systems Systems

Load Dispersal

Load Dispersal

into the Continuous Purlin system.

The Purlins transfer the load... 5

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Wind Wind Bracing Bracing Systems Systems

Wind Wind Bracing Bracing Systems Systems

Load Dispersal

Load Dispersal

into the roof Brace Rods.

The load travels through the Roof bracing... 7

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Wind Wind Bracing Bracing Systems Systems

Wind Wind Bracing Bracing Systems Systems

Load Dispersal

Load Dispersal

through the Eave Purlin ...

to the wall Diagonal Bracing ... 9

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Wind Wind Bracing Bracing Systems Systems

Wind Wind Bracing Bracing Systems Systems

Load Dispersal

Load Dispersal

...(or auxiliary bracing)...

into the Building’s foundation. 11

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Wind Wind Bracing Bracing Systems Systems

Standard EP Location

Load Dispersal

into the Building’s foundation. 13

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Roof Rods Break at Endpost(s)

Wind Bracing

If possible, keep endpost spacing similar at each endwall for a more efficient bracing pattern.

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Wind Wind Bracing Bracing Systems Systems

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Diagonal Diagonal Bracing Bracing • VP standard bracing utilizes Diagonal

Standard Bracing Methods

Bracing in the Roof and Walls.

• The bracing design is determined by: § Building Loads & Code § Building Size § Building Location 17

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Diagonal Diagonal Rod Rod Bracing Bracing

Diagonal Rods

Notes about Diagonal Rod Bracing: • Slightly more expensive than cable bracing

• Stiffest bracing system available

Eave

Floor 19

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Diagonal Rods

Diagonal Rods

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Diagonal Diagonal Rod Rod Bracing Bracing Options Options

Brace Rod to Floor

Eave

Floor

2/3 bay space minimum 23

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Diagonal Diagonal Bracing Bracing Options Options (Rods) (Rods)

Alternate Diagonal Bracing

Eave

Floor

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Rod Brace Assembly

Wind Wind Bracing Bracing Systems Systems

Alternative Bracing Methods 27

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Alternative Alternative Bracing Bracing Methods Methods

Torsional Bracing

Torsional Bracing

Rods are omitted from one sidewall. 29

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Alternative Alternative Bracing Bracing Methods Methods

Alternative Alternative Bracing Bracing Methods Methods

Notes About Torsional Bracing • Inexpensive • • • •

Portal Bracing Portal Brace Includes:

Maximum building width of 50’ Maximum eave height of 18’ 100 mph maximum wind speed Minimum 3 bays

•Portal Beam •Knee Braces •Additional column support

• Call your Service Center if close to these

•Clips, bolts & nuts

parameters

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Alternative Alternative Bracing Bracing Methods Methods

Portal Bracing

Notes About Portal Bracing • More expensive than rods • Flexible, not as stiff as diagonal bracing

• Maximum eave height of 20’ • Special clearances possible

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Portal Bracing

Portal Bracing

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Portal Bracing

Portal Bracing???

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Portal Frame

Alternative Alternative Bracing Bracing Methods Methods Portal Frames Portal Frame Includes: • Portal Frame Beam • Portal Frame Columns • Load Transfer Brackets or Clips

• Bolts and Nuts 40

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Portal Frame

Alternative Alternative Bracing Bracing Methods Methods Notes About Portal Frames • More expensive than rods • Relatively stiff • Special clearances possible

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Portal Frame

Alternative Alternative Bracing Bracing Methods Methods

(typ. typ. Anchor Bolt Detail)

Eave

Floor

Combination of Rods and Portal Frame • May be more economical in some cases

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Bracing Comparisons (Building Size = 200 x 300 x 19, 99BOCA, 80 MPH Wind - Book Price Shown)

Partial Height Portal Frame $8,000 $7,000 $6,000 $5,000

Rods Portal Brace Portal Frame

$4,000 $3,000 $2,000 $1,000 $0 Bracing Type 46

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Caution! Caution!

Strut Bracing at Wall

Bracing types may not be mixed in any single plane...however, it is OK to mix them within the same bay

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Rod Bracing at Truss Frame

Rod Bracing at Truss Frame

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Rod Bracing at Crane

Rod Bracing at Facade

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No No Bracing?!?!?! Bracing?!?!?! As erection proceeds all Brace Rods, Flange Braces, Struts, Purlin/Girt Laps should be installed before proceeding. All buildings will require some temporary bracing until all erection is complete ! Do NOT take any chances !

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What Wind Can Do!

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Bracing Tips n

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Bracing most effective at 45 degree angle “X”X”-bracing always most economical Consider Int.Col. Int.Col. Bracing at wide buildings Consider “shear “shear walls” walls” with masonry, etc. 58

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