2012 IBC Review of Height and Area Opportunities for Light-Frame and CLT

Transcription

1 2012 IBC Review of Height and Area Opportunities for Light-Frame and CLT Michelle Kam-Biron, P.E., S.E., SECB Director of Education American Wood Council

2 Outline 2012 IBC Heights and Areas Type III, IV, and V Construction Height and Area Increases Examples 2015 IBC inclusion of CLT Examples Type IV via 2012 IBC

3 Governing Code 2012 International Building Code

4 Table 503 Excerpt - Allowable H&A p. 8 Group! A-3! B! E! M! R%1! R-2! S-1! Height (ft)! A 65! Type of Construction! Type III! Type IV! Type V! B 55! HT 65! Stories (S)! Area (A)! A 50! B 40! S! 3! 2! 3! 2! 1! A! 14,000! 9,500! 15,000! 11,500! 6,000! S! 5! 3! 5! 3! 2! A! 28,500! 19,000! 36,000! 18,000! 9,000! S! 3! 2! 3! 1! 1! A! 23,500! 14,500! 25,500! 18,500! 9,500! S! 4! 2! 4! 3! 1! A! 18,500! 12,500! 20,500! 14,000! 9,000! S! 4! 4! 4! 3! 2! A! 24,000! 16,000! 20,500! 12,000! 7,000! S! 4! 4! 4! 3! 2! A! 24,000! 16,000! 20,000! 12,000! 7,000! S! 3! 2! 4! 3! 1! A! 26,000! 17,500! 25,500! 14,000! 9,000!

5 Table 503 Excerpt - Allowable H&A Group A-3! B! E! M! R-1! R-2! S-1! Height (ft) A 65 Type of Construction Type II Type III Type IV Type V B 55 A 65 Stories (S) Area (A) S! 3! 2! 3! 2! 3! 2! 1! A! 15,500! 8,500! 14,000! 9,500! 15,000! 11,500! 6,000! S! 5! 3! 5! 3! 5! 3! 2! A! 37,500! 23,000! 28,500! 19,000! 36,000! 18,000! 9,000! S! 3! 2! 3! 2! 3! 1! 1! A! 26,500! 14,500! 23,500! 14,500! 25,500! 18,500! 9,500! S! 4! 2! 4! 2! 4! 3! 1! A! 21,500! 12,500! 18,500! 12,500! 20,500! 14,000! 9,000! S! 4! 4! 4! 4! 4! 3! 2! A! 24,000! 16,000! 24,000! 16,000! 20,500! 12,000! 7,000! S! 4! 4! 4! 4! 4! 3! 2! A! 24,000! 16,000! 24,000! 16,000! 20,000! 12,000! 7,000! S! 3! 2! 3! 2! 4! 3! 1! A! 26,000! 17,500! 26,000! 17,500! 25,500! 14,000! 9,000! B 55 HT 65 A 50 B 40

6 Exception p. 12! Section permits increased building heights 20 feet 1 story above grade. NFPA 13

7 Height Increases for Sprinklers + 1 story and 20 ft. Table 503 limit

8 Area Increases p. 9 Section 506 Building Area Modification A a = A t + [A t x I f ] + [A t x I s ]! A a = Allowable area per story! A t = Tabular area per story! I f = Area increase factor due to frontage! I s = Area increase factor due to sprinkler protection

9 Code Conforming Wood Design Now using CCWD tables...

10 Group B NFPA 13 Sprinklered p.31

11 Group R - NFPA 13 Sprinklered p. 43

12 Mixed Use Galt Project Team: Owner: City of Galt and CFY Development Inc. General Contractor: CFY Development Inc. Architect: Michael F. Malinowski, AIA, Applied Architecture Inc. Structural Engineer: Mike Baker, SE, Baker Guptil Structural Designs, Inc. Framer: Becker General Contractors Construction Timeline: March 2011 to occupancy in June 2012

13 Mixed Use Galt

14 Mixed Use Galt Architectural Components Construction Type: VA Areas & Occupancies: Level 1: S-2 (24,633 sf) Enclosed, A2, M and B Retail/Restaurant/Office and Residential Administration (14,356 sf) Levels 2 and 3: R-2 88 Units (62,480 sf) Sprinklers: NFPA 13 sprinkler system R-2 R-2 S-2 Enclosed, A2, M & B Approx. 47

15 Mixed Use

16 Oceano at Warner Center Project Team: Owner: TDI California Construction & Oceano Partners General Contractor: TDI California Construction Architect: RC Alley III, NCARB, Architects Orange Structural Engineer: Tom VanDorpe, SE, VanDorpe Chou Associates, Inc. (VCA) Framer: Brian Larrabure, Larrabure Framing Construction Timeline: January 2011 to occupancy in July 2012

17 Oceano at Warner Center

18 Oceano at Warner Center Architectural Components Construction Type: VA Occupancies: Below Grade: S-2 Enclosed semisubterranean parking below grade Levels 1-4: R-2 Building units (146,847 sf) and Building units (163,468 sf) Sprinklers: NFPA 13 sprinkler system R-2 R-2 R-2 R-2 S-2 Enclosed Approx. 55

19 Oceano at Warner Center

20 Building Code 2015 International Building Code

21 2015 IBC

22 2015 IBC ASTM E119 Fire Endurance Test 5-Ply CLT (~7 thick) 5/8 Type X GWB each side 3 hours 6 minutes IBC-Challenges/

23 2015 IBC ANSI/APA PRG Standard for Performance-Rated Cross-Laminated Timber

24 2015 NDS 2015 National Design Specification for Wood Construction CLT Provisions

25 2015 IBC Code modifications to Ch. 23 Wood Structural glued cross laminated timber. Crosslaminated timbers shall be manufactured and identified as required in ANSI/APA PRG CROSS-LAMINATED TIMBER. A prefabricated engineered wood product consisting of at least three layers of solid-sawn lumber or structural composite lumber where the adjacent layers are crossoriented and bonded with structural adhesive to form a solid wood element. Code modifications to Ch. 35 Wood ANSI or APA ANSI/APA PRG Standard for Performance-Rated Cross- Laminated Timber

26 2015 IBC Type IV Construction Type IV. Type IV construction (Heavy Timber, HT) is that type of construction in which the exterior walls are of noncombustible materials and the interior building elements are of solid or laminated wood without concealed spaces. The details of Type IV construction shall comply with the provisions of this section. Fire retardant treated wood framing complying with Section shall be permitted within exterior wall assemblies with a 2-hour rating or less. Exterior walls complying with Section or shall also be permitted. Minimum solid sawn nominal dimensions are required for structures built using Type IV construction (HT). For glued-laminated members the equivalent net finished width and depths corresponding to the minimum nominal width and depths of solid sawn lumber are required as specified in Table Cross laminated timber (CLT) dimensions used in this section are actual dimensions.

27 2015 IBC Type IV Construction Exterior Walls Fire-retardant-treated wood framing complying with Section shall be permitted within exterior wall assemblies with a 2-hour rating or less Cross-laminated timber complying with Section shall be permitted within exterior wall assemblies with a 2-hour rating or less provided: Exterior surface of the cross-laminated timber is protected fire retardant treated wood sheathing complying with and not less than 15/32 inch thick; OR gypsum board not less than ½ inch thick; OR a noncombustible material.

28 IBC " Type IV Construction Floors CLT. Cross laminated timber shall be not less than 4 inches (102 mm) in thickness. It shall be continuous from support to support and mechanically fastened to one another. Cross laminated timber shall be permitted to be connected to walls without a shrinkage gap providing swelling or shrinking is considered in the design. Corbelling of masonry walls under the floor shall be permitted to be used.

29 2015 IBC " Type IV Construction Roofs Roofs. Roofs shall be without concealed spaces and wood roof decks shall be sawn or glued laminated, splined or tongue-andgroove plank, not less than 2 inches (51 mm) nominal in thickness,; 11/8- inch-thick (32 mm) wood structural panel (exterior glue), or of; planks not less than 3 inches (76 mm) nominal in width, set on edge close together and laid as required for floors.; or of cross laminated timber. Other types of decking shall be permitted to be used if providing equivalent fire resistance and structural properties Cross laminated timber roofs shall be not less than 3 inch nominal in thickness and shall be continuous from support to support and mechanically fastened to one another.

30 2015 IBC " Type IV Construction Interior Walls & Partitions Interior Walls and Partitions. Interior walls and partitions shall be of solid wood construction formed by not less than two layers of 1- inch (25 mm) matched boards or laminated construction 4 inches (102 mm) thick, or of 1-hour fire-resistance-rated construction Exterior walls. All exterior walls shall be of one of the following: 1. Noncombustible materials; or 2. Not less than 6 inches in thickness and constructed of one of the following: 2.1 Fire retardant treated wood in accordance with and complying with or 2.2. Cross laminated timber complying with

31 2015 IBC Type IV

32 IBC Table 503 Excerpt - Allowable H&A Group A-3! B! E! M! R-1! R-2! S-1! Height (ft) Type of Construction Type II Type IV A 65 B 55 HT 65 Stories (S) Area (A) S! 3! 2! 3! A! 15,500! 8,500! 15,000! S! 5! 3! 5! A! 37,500! 23,000! 36,000! S! 3! 2! 3! A! 26,500! 14,500! 25,500! S! 4! 2! 4! A! 21,500! 12,500! 20,500! S! 4! 4! 4! A! 24,000! 16,000! 20,500! S! 4! 4! 4! A! 24,000! 16,000! 20,000! S! 3! 2! 4! A! 26,000! 17,500! 25,500!

33 IBC 2012 HT w/ Sprinklers and Open Frontage Group A-3! B! E! M! R-1! R-2! S-1! Height (ft) A 65 Type of Construction Type II Type IV Type IV a,b,c B 55 Stories (S) Area (A) S! 3! 2! 3! 4! A! 15,500! 8,500! 15,000! 42,180! S! 5! 3! 5! 6! A! 37,500! 23,000! 36,000! 67,500! S! 3! 2! 3! 4! A! 26,500! 14,500! 25,500! 71,710! S! 4! 2! 43! 5! A! 21,500! 12,500! 20,500! 46,120! S! 4! 4! 4! 5! A! 24,000! 16,000! 20,500! 46,120! S! 4! 4! 4! 5! A! 24,000! 16,000! 20,000! 46,120! S! 3! 2! 4! 5! A! 26,000! 17,500! 25,500! 40,420! NFPA 13 sprinklers 30 open frontage all around HT 65 HT 85

34 IBC 2015 Type IV Fire-Resistance Requirements

35 IBC 2015 Type IV Fire-Resistance Requirements

36 Franklin Elementary School Source: LignaTerra Franklin, West Virginia 46,200 sq. ft. 8 week assembly

37 Franklin Elementary School Source: LignaTerra

38 Franklin Elementary School Scheduled completion: Winter 2015

39 2015 IBC Revise 510 levels above grade SECTION 510 SPECIAL PROVISIONS Horizontal building separation allowance. A building shall be considered as separate and distinct buildings for the purpose of determining area limitations, continuity of fire walls, limitation of number of stories and type of construction where all of the following conditions are met: 1. The buildings are separated with a horizontal assembly having a fireresistance rating of not less than 3 hours. 2. The building below the horizontal assembly is not greater than one story above grade plane.

40 Building Height Stacked Buildings Building Height in feet Upper building height (feet) is measured from grade plane Building Height stories Upper building height (stories) measured from top of lower building 6 stories 80 ft max Residential Occupancy floors 2 thru 6 Upper Building Height 4-5 stories Grade Plane Closed Parking Garage 1 st floor NFPA 13 Sprinklers

41 Building Height Stacked Buildings Building Height in feet Upper building height (feet) is measured from grade plane Building Height stories Upper building height (stories) measured from top of lower building 6 stories 80 ft max Grade Plane Residential Occupancy floors 2 thru 6 Parking Garage 1 st & 2 nd floor Upper Building Height 4-5 stories NFPA 13 Sprinklers

42 Code Conforming Wood Design Available free

43 Questions?