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MBMA 2012 Deflection Limit

This document provides guidelines and standards for designing and constructing metal building systems, including references to specifications for structural steel, cold-formed steel framing, and composite slabs. It excerpts deflection limits from the International Building Code for various structural members under different loading conditions. Roof slopes can be achieved through structural sloping, tapered insulation, or sloped fill and should drain to low points via drains, gutters, or scuppers.

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Hoang Duc Loc
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2K views1 page

MBMA 2012 Deflection Limit

This document provides guidelines and standards for designing and constructing metal building systems, including references to specifications for structural steel, cold-formed steel framing, and composite slabs. It excerpts deflection limits from the International Building Code for various structural members under different loading conditions. Roof slopes can be achieved through structural sloping, tapered insulation, or sloped fill and should drain to low points via drains, gutters, or scuppers.

Uploaded by

Hoang Duc Loc
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Metal Building Systems Manual

• AISC 360, Specification for Structural Steel Buildings, (AISC, 2010)


• AISI S100, North American Specification for Design of Cold-Formed Steel
Structural Members (AISI, 2007) with 2010 Supplement, dated 2010
• AISI S200, North American Standard for Cold-Formed Steel Framing -General
Provisions (AISI, 2007)
• AISI S214, North American Standard for Cold-Formed Steel Framing - Truss
Design (AISI, 2007) with Supplement 2, dated 2008
• ASCE 3, Standard for the Structural Design of Composite Slabs (ASCE, 1991)
• ASCE 8-SSD-LRFD/ASD, Specification for the Design of Cold-Formed Stainless
Steel Structural Members (ASCE, 2002)
• SJI Standard Specifications, Load Tables and Weight Tables for Steel Joists and
Joist Girders. See references.

Model building codes require that the deflection of structural members divided by the span, l,
not exceed certain values. For example, see Table 1604.3 of the International Building Code.
Some applicable provisions from these references are excerpted below:

Excerpts From 2012 IBC Table 1604.3

CONSTRUCTION LIVE SNOW OR WINDa DEAD + LIVE

Roof members:
Supporting plaster ceiling l / 360 l / 360 l / 240
Supporting nonplaster ceiling l / 240 l / 240 l / 180
Not supporting ceiling l / 180 l / 180 l / 120
Roof members supporting metal l / 150 - -
roofing:
Structural Metal Roof and Siding
- - l / 60
Panelsb

Floor Members l / 360 - l / 240

Exterior walls and interior


partitions:
With brittle finishes
- l / 240 -
With flexible finishes
- l / 120 -
Secondary wall members
- l / 90 -
supporting metal siding
(a) The wind load is permitted to be taken as 0.42 times the component and cladding loads for the purpose
of determining deflection limits herein.
(b) For roofs, this exception only applies when the metal sheets have no roof covering.

Roof slopes can be directed to drains by sloping the structure, using tapered insulation,
sloping fill, or by using a combination of these methods. Roof drains, gutters or scuppers are
located at the low points. As the NRCA notes, from time to time, roof drainage points do not
wind up at roof low points and can cause problems for the structure.

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