Feb 6, 2013 - Codes. In Process. Georgia. 2006 IBC 2012 IBC: 1/1/2014. Florida ... No technical changes to thresholds ..
American Wood Council “The Wood Products Council” is a Registered Provider with . Credit(s) earned on completion of this program will be reported to AIA/CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request. This program is registered with AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product.
Codes and Standards Update Wood Solutions Fair Atlanta, GA February 6, 2013 Copyright Materials
Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
At the end of this program, participants will be able to: 1. Identify building code issues which are leading to code changes. 2. Identify recent changes to wood design standards that affect design of wood structures. 3. Identify recent code changes which will impact future design of wood structures. 4. Understand reasons for changes to the IBC and wood design standards.
History of AWC
AWC Issues
1902 – National Lumber Manufacturers Association 1965 – National Forest Products Association
Codes and Standards Environmental Regulations Green Building
1991 – American Wood Council – Codes & Engineering
1993 – American Forest & Paper Association 2010 – American Wood Council
Today’s Program: Describe major model codes for structural and fire Describe the major wood standards referenced in the model codes Describe significant changes in model codes and referenced wood standards
International Building Code
International Building Code
Cycle just ended for 2015 IBC Contents are known Sneak peek at a few changes
2006/2009 IBC – most used currently
State
Current Codes
In Process
Georgia
2006 IBC
2012 IBC: 1/1/2014
Florida
2009 IBC
2012 IBC: March 2014
Alabama
2009 IBC
Unknown
Tennessee
2006 IBC
Jurisdictional autonomy – some 2012 movement
North Carolina
2009 IBC
2012 adoption process begins soon
South Carolina 2006 IBC
Significant Changes to IBC
2012 IBC: Summer 2013 tentative
Significant Changes to 2012 IBC Story heights in unprotected (nonrated) construction—Types 3B and 2B— reduced for certain use groups S-1, B, and M
No other changes to standard heights and areas Watch for restructured height and area formulas and tables in 2015 No technical changes to thresholds
Significant Changes to 2012 IBC
Significant Changes to 2012 IBC
Group A-3 Assembly occupancies can now be unlimited in area, with conditions:
Pedestal Buildings Requirements continue to evolve for flexibility Permitted use groups expanded Separate wood building on top of higher construction type
Full open frontage of 60 feet all around Sprinklers No stage Exits at grade Types III & IV
Significant Changes to 2012 IBC
Significant Changes to 2012 IBC
Live/work units – can be R-2 and not mixed occupancies Special requirements for size, egress, and fire protection systems
Expanded permitted use of FRTW Slightly more uses in roofs of Types 1 and 2 buildings Only restriction is Type 1A without 20 feet floor to roof Increased applications for penthouses in all construction types
Sprinklers
Flexibility Check zoning
Significant Changes to 2012 IBC
Significant Changes to 2012 IBC Sprinkler threshold changes School and mercantile thresholds
previously 5 ft
lot line
interior
More restrictive
if ≤ 10 ft wall must be rated for exposure from both sides
Means of egress width reduction Areas of refuge in accessible means of egress eliminated Trade-offs remain substantial
Significant Changes to 2012 IBC
Significant Changes to 2012 IBC
ASCE 7-10 has changes for wind design New “strength design”- basis maps show higher wind speeds
ASCE 7-10 Wind Provisions and Effects on Wood Design and Construction
Effective pressures remain about the same
Separate wind map for each Risk Category Exposure D will be applicable
By Line and Coulbourne
Download for free at www.awc.org Search “ASCE” - it will be the first link
Significant Changes to 2012 IBC
Significant Changes to 2012 IBC
Additional special inspections required for wood frame main wind reinforcing systems in higher wind regions
New ICC standard ICC-400, Standard on the Design and Construction of Log Structures
Section 1706
New special inspection requirement for installation and bracing of long-span >60 ft trusses Section 1704
Coming in 2015 IBC
Reformatted height and area provisions Provisions for Cross Laminated Timber New engineered wood rim board standard
Coming in 2015 IBC Inclusion of Cross Laminated Timber in Type IV construction type (and reference of ANSI/APA PRG 320-2012)
Coming in 2015 IBC
Coming in 2015 IBC
CLT Handbook now available www.masstimber.com Free download
New standard referenced for engineered wood rim boards – ANSI/APA PRR 410-2011
Coming in 2015 IBC
Coming in 2015 IBC
Slightly broader application of WFCM Re-organization of Conventional Wood Frame Construction Provisions (2308) Revised span tables based on new Southern Pine design values
Slightly broader application of WFCM Chapter 2 loads Applicable to non-res Permitted resource
Coming in 2015 IBC
Wood Design Standards
Clarification of continuity requirements for fire resistance rated exterior walls Structural connection and wall intersection clarifications
Wood Design Standards
Significant Changes—2005 NDS
Standards become part of the code “to the prescribed extent” of the reference only Editions are specific
First dual-format (ASD/LRFD) edition of the NDS Appendix N—Load and Resistance Factor Design Revised format of beam and column stability provisions (addition of Emin property)
Top updates to 2008 SDPWS High load diaphragms Combined shear and uplift with WSPs Unblocked shear walls Shear wall anchorage provisions—3x square WSP over gypsum shear walls
Significant Changes—2008 SDPWS
Significant Changes—2008 SDPWS
Shear walls sheathed 2 sides Fiberboard shear wall aspect ratio adjustment Increased strength limit for perforated shear walls (PSW) PSW shear strength equation Appendix for Standard Nail and Washer Sizes
Using WSPs for combined shear and uplift
Photo: APA
Significant Changes—2008 SDPWS
Significant Changes—2008 SDPWS
Using WSPs for combined shear and uplift
Using WSPs for combined shear and uplift
Choose shear wall design Determine uplift forces by calculation or using the WFCM Enter Table 4.4.1 of SDPWS to find a wall with needed uplift capacity Check that nailing exceeds what is required for shear design alone
What’s next?
Diagrams included for all critical details, including midstory height connections
What’s Next—Some Thoughts Simplification needed Practicality needed Code cycle extended to 6 years ASCE 7 Load calculations simplified Cycle extended to 6 years
