WoodWorks. WoodWorks. WoodWorks. WoodWorks. Wood Products Council. Introduction. Technical Director WoodWorks Southeast Technical Manager ilevel

Transcription

1 Wood Products Council WoodWorks A RESOURCE FOR DESIGN PROFESSIONALS Incorporated as the WPC in December 2006 WoodWorks WoodWorks Engineers Architects Developers General Contractors Building owners Builders Seismic Issues Fire Protection Code Issue Resolution Energy Efficiency Sustainable Construction Cost Effective Designs WoodWorks Introduction Technical Director WoodWorks Southeast Technical Manager ilevel Staff Engineer American Wood Council scott@woodworks.org Phone:

2 Copyright Materials Utilization of Heavy Timber in Modern Commercial Buildings Presented By: Scott Lockyear This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is prohibited. Wood Products Council Wood Products Council is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-aia members are available on request. This program is registered with the 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. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation. Overview What is Heavy Timber Construction? Building Type Effects Engineered Wood Decking/Diaphragms g Connections Why select Timber Framing? Why select Timber Framing? Layton Petro Mart

3 What is a Timber Frame? Resistant to Fire Exposed Wood Members Lack of Concealed Spaces O fl l Open floor plans Dramatic vaulted ceilings Heavy Timber as Defined in the IBC Guided by IBC section Minimum Sizes Floor Framing B Beam Supporting S ti Floor Load > 6x10 nominal Column Supporting Floor Load > 8x8 nominal Photo off Hoffstadt ff Bluff ff Visitor s Center C Arch Sprung From the Ground Arch Sprung From the Ground Arches supporting roof loads from top of wall shall be > 4x6 Timber Arches supporting roof loads and springing from floor > 6x8 at bottom & 6x6 at top Timber Arches supporting floor loads and springing from floor > 8x8 nominal Images Provided by Structural Wood Corporation

4 Minimum Sizes Roof Framing Minimum Sizes Roof Framing Beam Supporting Roof Load > 4x6 nominal Column Supporting Roof Load > 6x8 nominal Roof Decking > 2x T&G Deck > 1-1/8 WSP Often 7/16 sheathing may be applied over 2x deck Truss Framing > 4x6 Photo of Hoffstadt Bluff Visitor s Center Photo of Hoffstadt Bluff Visitor s Center Beams in Rated Assemblies Exterior structural members If horizontal separation of 20 ft is provided, Heavy timber wood columns and arches permitted externally. Photo of Outdoor Store South of Chattanooga by S. Lockyear Why is Type IV in the code Historical Practice Fire Resistance Fire Resistance through Char / Pyrolysis Chemical change brought about by the action of heat CHAR OCCURS AT C Photos provided by Structural Wood Corporation

5 Trees after 2007 GA Fires Choosing a Building Type? Photo by S. Lockyear Navigating Allowable H & A Alternative to Type IV construction Type I: Significant wood restriction Type II: Significant wood restriction Type III: Minor wood restriction Type IV: Heavy Timber Type V: Wood readily allowed BY ORDER OF H&A ALLOWED Type I Type IV Type II Type III V Timber construction is allowed even when it does not meet Type IV construction Type IIIB and VB unprotected construction Allows for conventionally framed walls or SIPS Using Timber w/o Type IV Type IIIB construction offers: Allowable heights identical to IIB Allowable areas identical to IIB Exception: IIB > IIIB for B, F-1, F-2, H-3, H-5, I-2, and I-3 Timber Frame in IIIA or VA construction IIIA and VA require one hour rated floor and roof assemblies in addition to one to two hour wall assemblies

6 Achieving one hour equivalency Protecting Steel Connections Common Techniques Additional Design Material Calculated Fire Endurance DCA 2 EXCERPTS Why Use Type IV construction? To take advantage of increased height relative to type II, III, and V. Occurs > 50% of time Type IV offers 1 additional story typically relative to Type II and III GROUP R 2 A 2 TYPE OF CONSTRUCTION TYPE I TYPE II TYPE III TYPE IV TYPE V A B A B A B HT A B HGT (FT) HGT (S) UL S UL A UL UL 24,000 16,000 24,000 16,000 20,500 12,000 7,000 S UL A UL UL 15,500 9,500 14,000 9,500 15,000 11,500 6,000 Utilize Height Advantage in Type IV IBC Balconies Tabulatedand similar projections of Heights combustible up to 5 stories construction..or shall be of Type IV construction in accordance with Section Office Building Quebec, QC Dimensions: 65 ft x 170 ft Height: 6 storey Completed: 2009 Why Use Type IV construction? To incorporate into Type IB and IIA roof systems Balconies in Type III, IV, and V Balcony Exterior Wall Roof Construction d. In all occupancies, heavy timber shall be allowed where a 1-hour or less fire-resistance rating is required. Preservatively Treated Wood Beam Top Notched For Balcony One Hour Floor Assembly

7 Type IV Applications Gas Station Canopies Canopies - Shall be of noncombustible materials, fire-retardant-treated retardant treated wood complying with Chapter 23, wood of Type IV sizes or of construction providing 1-hour fire resistance. Combustible materials used in or on a canopy shall comply with one of the following: 1. Shielded from the pumps by a noncombustible element of the canopy, or wood of Type IV sizes; Type IV Applications Gas Station Canopies Canopies - Shall be of noncombustible materials, fire-retardant-treated retardant treated wood complying with Chapter 23, wood of Type IV sizes or of construction providing 1-hour fire resistance. Combustible materials used in or on a canopy shall comply with one of the following: 1. Shielded from the pumps by a noncombustible element of the canopy, or wood of Type IV sizes; Kiaweh Island, SC Using Wood In Georgia Schools Heavy Timber as Defined in Section 602 oftheibcmaybeused used. Example Project; Fayetteville, NC 110,000sf Heavy Timber Roof System Using Wood In Georgia Schools Heavy Timber as Defined in Section 602 oftheibcmaybeused used. Example Project; Fayetteville, NC 110,000sf Heavy Timber Roof System photo by B. Lindsey photo by B. Lindsey Beams in Rated Assemblies What about Engineered Lumber Products? Glued Laminated Timber Structural Composite Lumber Jack Daniel s Distillery photo by S. Lockyear QUIZ TIME Is this allowed in a IIA building?

8 Equivalent Glued Laminated Net Size Engineered Wood Beams Glulam & Structural Composite Lumber Glued Laminated Beams Available in: Framing/Industrial Grades Intended for non-exposed conditions. Architectural Intended for exposed members. Premium Grade also available Glulam Appearance Grades AITC 110 Glued Laminated Beams Available in: Framing/Industrial Grades Intended for non-exposed conditions. Architectural Intended for exposed members. Premium Grade also available Multi-Ply Columns OK for Unprotected Construction ti Multi-Ply is Solid Section for Minimum Sizes Gainesville Veterinary Clinic photo by S. Lockyear Tongue and Groove Decking T&G Decking Considerations Span Configurations Tongue & Grooved vs. Splined Wood Species Grade of Wood Diaphragm Design Racine Wisconsin Hotel photo by S. Lockyear Racine Wisconsin Hotel photo by S. Lockyear

9 Diaphragm Options Tongue and Groove Decking Horizontally applied tongue and groove decking Diagonally applied tongue and groove decking Wood Structural Panel Sheathing STRUCTURAL FRAMING T&G DECKING WSP may be applied for diaphragm design Tongue and Groove Decking Tongue and Groove Decking STRUCTURAL FRAMING T&G DECKING Decking Choices - Simple SPAN Decking Choices - Continuous SPAN LENGTH BOARD LENGTH BOARD

10 Decking Choices Cantilevered Pieces Decking Spans Controlled Random Layup 2 inch Decking Timber Connections Connection Options Bolted Mortis & Tenon Timber Rivets Split Rings & Shear Plates Connection Options Bolted Connections Split Rings

11 Shear Plates Timber Rivet Other Joint System JOINERY HALF-LAP DOVETAIL COLLAR TIE COMMON RAFTERS AT RIDGE JOINERY Examples Image provided by SWS NFPA 1961 test Witnessed by 80 code officials and insurance representatives Steel bar joist and solid sawn wood exposed to fire. RAFTER TO KING POST CONNECTION $17,000,000 77,000sf Murchison Performing Arts Center North Denton, TX

12 Murchison Performing Arts Center Examples Seating 1, Span SWS AL supplied glulam "glulam l structural t members were structurally, aesthetically, and economically the material of choice." Image provided by SWS NFPA 1961 test Witnessed by 80 code officials and insurance representatives Steel bar joist and solid sawn wood exposed to fire. Architects: KVG Gideon Toal and Hardy Holzman Pfeiffer Associates Engineers: Frese & Nichools, Inc. Contractor: Huber, Hunt and Nichols Inc. Heavy Timber Roof Focal point is heavy timber framework at entry core area and water park. Great Wolf Lodge Resort, located in Concord, NC, is a $70 million, 470, square foot complex. It will contain 402 hotel guest units, a 90,000 square foot indoor water park, and a 20,000 square foot convention center. Kraemer Brothers, LLC of Plain, WI has contracted with Universal Forest Products to provide and install all rough carpentry, wood trusses, and fiber cement siding. David Boyce (E285 Dallas, NC) is the account manager for the $6.7 million turn-key project. Dan Chaney is coordinating all efforts with David Boyce as General Manager of Operations in Dallas. The project started in November 2007 and is expected to be complete in March Image above is a partial view of west wing of building. Photo by Universal Forest Products Large Roof With Structural Panels Glued Laminated Beams with T&G Photo by Universal Forest Products Photo by Universal Forest Products

13 YMCA Fitness Center Anaheim Ice Arena In corrosive chlorine environment wood is a popular choice. 116 Span Anaheim Ice Arena 6,000 sf Building Expansion Architect Eric Owen Moss Supplier Structurlam Engineer - Englekirk Partners Consulting Structural Engineers, Inc. Hayden Warehouse Glulam span /8 to 6-3/4 wide 9 to 30 deep 12 o.c. 2x rafters 16 o.c. Hayden Warehouse Review What is Heavy Timber Construction? Building Type Effects Engineered Wood Decking/Diaphragms Connections Projects

14 Technical Resources Technical Resources - Technical Resources - American Wood Council - Make Your Next Building a Top Ten Candidate Questions Scott Lockyear WoodWorks scott@woodworks.org Phone: