1
Web: WWW.BRBCODEEDUCATORS.COM
Joe Belcher, CBO, President [email protected] (352) 450-2631 (813) 925-4152 Fax
2
Contact Hours: 1 hour (1 CEH) Title: FBCB Building/Structural Summary Nos.: CILB 0609364 Instructor: Joe Belcher Date 2-11, 2012 Location: Port St. Lucie, FL
2010 Florida Building Code, Building With Supplements/Structural Summary
In General
5
Building/Structural Summary This Summary of the 2010 Florida Building Code,
Building, provides an overview of changes from the 2007 Florida Building Code. The changes reflect changes in the base code and Florida Specific Amendments : The 2009 International Building Code is the base code for
the Florida Building Code, Building. The 2009 International Residential Code is the base
code Florida Building Code, Residential.
2010 FBCB
6
Building/Structural Summary Chapter 1 of the Florida Building Code,
Building, is the administrative chapter for all volumes of the FBC.
Chapter 1 of the Residential, Mechanical, Plumbing, Existing Building, and Gas volumes of the FBC refer to Chapter 1, Administration, of the Florida Building Code, Building, to govern the administration and enforcement.
7
Building/Structural Summary Chapters 11 and 13 converted to
separate volumes of the Florida Building Code, Building,
Chapter 11 refers to the 2012 Florida Accessibility Code
Chapter 13 refers to the Florida Building Code, Energy Conservation
2010 FBCB
Chapter 1: Conflicts
FBCB 102.1 Mod 3456: AAF Opposed. Would have required application of most
stringent provisions between general versus specific requirements. Submitted as an effort to overturn the Dec Statement in which the Commission agreed with the AAF position that electrical receptacles are not required in unconditioned and non-habitable sunrooms (DCA09-DEC-351).
Chapter 1: Administration 102.8 Existing Mechanical
Equipment.
New provision prohibiting jurisdictions from requiring upgrade of the installation of roof mounted equipment until equipment is removed or replaced.
9
10
Chapter 1: Administration 107.3.5 Minimum plan review criteria
for buildings. Adds new items to list for commercial and
residential buildings.
Flood hazard areas.
Impact resistant coverings or systems.
2010 FBCB
Chapter 1: Administration 110.3 Required inspections.
Building 2. Framing Inspections Modified Item 9 eliminating application to required systems only.
Installation of all impact resistant coverings or systems require inspection and permits.
11 FBCB 2010
Fire Resistance R302.1 Exterior Walls – Exception 7 added
R302.1 Exterior walls. Construction, projections, openings and penetrations of exterior walls of dwellings and accessory buildings shall comply with Table R302.1.
Exceptions:
7. Screen enclosure walls of insect screening with a maximum of 25% solid flexible finishes.
Fire Resistance R302.3 Two-family dwellings - Exception 3 added.
R302.3 Two-family dwellings. Dwelling units in two-family dwellings shall be separated from each other by wall and/or floor assemblies having not less than a 1-hour fire-resistance rating when tested in accordance with ASTM E 119 or UL 263. Fire-resistance-rated floor-ceiling and wall assemblies shall extend to and be tight against the exterior wall, and wall assemblies shall extend from the foundation to the underside of the roof sheathing.
3. Screen enclosure walls of insect screening with a maximum of 25% solid flexible finishes.
14
CHAPTER 20: LIGHT METAL ALLOYS FBCB 2002 STRUCTURAL ALUMINUM
Reduces design load downward for purlins from 300 lb. to 200 lb.
Clarifies application of categories of sunrooms in AAMA 2100.
Modifies AMAA 2100 to delete reference to ASCE 7-98 and add reference to FBCB §1609.1.1 for determining wind loads for sunrooms.
Update Table 2002.4 to ASCE 7-2010.
FBCB 2010
Sunrooms 1202.1 Definition modified
Roof panels changed from structural to solid.
Glass, windows side-hinged and sliding and glass doors added to open areas.
Clarifies the Categories are for determination of applicable AAMA 2100 provisions
16
CHAPTER 12: Interior Environment
2. A one-story structure added to a dwelling with structural solid roof panels without sloped glazing. The sunroom walls may have any configuration, provided the open area areas with operable or fixed glass or windows or side hinged or sliding glass doors of the longer wall and one additional wall is equal to at least 65 percent of the area below 6 foot 8 inches of each wall, measured from the floor. For the purposes of this code the term sunroom as used herein shall include conservatories, sunspaces, solariums, and porch or patio covers or enclosures
FBCB 2010
17
CHAPTER 14: EXTERIOR WALLS
1404.9 Vinyl siding and soffit. (FSA)
Adds soffit to section.
1404.9.2 Adds requirement for labeling of manufactured soffit materials and systems.
1404.10 Adds base code language for fiber-cement siding correcting the type material to Type A.
2010 FBCB/ Base Code
Opening Protection Add language establishing the
enclosure of an exterior balcony or porch by screen or vinyl or acrylic windbreaks does not create a sunroom or trigger opening protection requirements for the screen, windbreak, or glazing separating balcony from interior.
AAF Guide/Windbreaks Updates the AAF Guide to the 2010
Edition.
Provide for the adoption of the AAF Guide in the HVHZ when designs sealed.
Added section for windbreaks to HVHZ portion.
WINDS OF CHANGE
ASCE 7-2010
Test Facilities
21
http://www.youtube.com/watch?v=cXF44jBBwxU&feature=player_detailpage
88 93 95
98
02
05
10
ASCE 7-10
Accepted IBC 2012 Accepted as Modified for
FBC 2010 FBC Implementation
March 15th, 2012 23
ASCE 7-10 Significant Changes
Complete reorganization of wind provisions
New wind speed maps
Changes building classification to Risk Category.
Does away with Importance Factors
Changes to wind-borne debris region
Re-introduction of Exposure D for water surfaces in hurricane-prone regions
Introduction of new simplified methods.
24
ASCE 7-10 Reorganization of Wind Provisions
ASCE 7-05: Chapter 6 contains all wind provisions
ASCE 7-10: 6 new Chapters (Ch. 26-31) each with flowcharts Intent is to clarify the applicability of the wind provisions Contains provisions for allowable stress design (Vasd ) and
strength design (LRFD) and Ultimate Strength or Load Factor Design (LFD)
Load factors provided for material-based design specifications that adopt a strength design
25
ASCE 7-10 Reorganization Wind Provisions
Chapter 26 – General Requirements Scoping Definitions Wind speed maps Exposure Gust factor Topographic factor
26
New Wind Data = New Maps Last Wind Speed Change – 1998 ASCE 7-98, 7-02, 7-05
More Data in the last 12 years Previous map used weather data from 208 points New map uses weather data from 2,851 points – 14X
previous data
Development
Interior US ASCE 7-05 wind speeds correspond to 50 year mean recurrence interval (MRI).
Applying 1.6 wind load factor results in wind pressures corresponding with 700 year MRI.
Critical facilities applying Imp Factor of 1.15 and wind load factor of 1.6 results in wind pressure of 1700 year MRI.
(Cont.)
Development Regions where design wind speed controlled by
hurricane events, wind speeds of ASCE 7-05 Figure 6-1 correspond to MRI that varies between 50 and 100 years.
Results in designs with inconsistent levels of reliability across the US.
(Cont.)
Development To provide similar level of reliability across US, a series
of maps used in ASCE 7-2010 showing various structure Risk Categories.
Three separate Basic Wind Speed maps are provided:
(Cont.)
Development 1. Figure 26.5-1A – 700 year MRI – Risk Category II
structures 2. Figure 26.5-1B – 1700 year MRI – Risk Category III and
IV structures 3. Figure 26.5-1C – 300 year MRI – Risk Category I
structures
Figure 26.5-1A Basic Wind Speeds for Occupancy Category II Buildings and Other Structures.
Factors Wind speeds in ASCE 7-05 in large parts
of US at 50 year MRI
Use of 1.6 factor results in 700 year MRI
Use of 1.15 Importance Factor results in 1700 year MRI
Result was inconsistency across US
Factors The wind load factor and importance
factor are now incorporated into the basic wind speed maps. For strength design load combinations maximizing wind effects, the wind load factor is now 1.0. For the corresponding ASD (Vasd) combinations, the wind load factor is 0.6.
Comparisons 7-05 and 7-10 Load factors “built- in” to 7-10 must
be removed
Wind pressures are proportional to wind speed squared
Requires dividing ASCE 7-10 wind speeds by the square root of the wind load factor of 1.6 (1.2649)
Comparisons 7-05 and 7-10 FBCB 2010 provides conversion table
and equation 1609.3.1 Wind speed conversion.
When required, ultimate design wind speeds of Figure 1609A, B and C shall be converted to nominal design wind speeds, Vasd using Table 1609.3.1 or Equation 16-32.
Comparisons 7-05 and 7-10
Comparisons 7-05 and 7-10 Vasd = Vult√0.6 (Equation 16-32) Where: Vasd = nominal design wind speed applicable to methods specified in Exceptions 1 through 5 of Section 1609.1.1 Vult = strength design wind speeds determined from Figures 1609a, 1609b, or 1609c.
ASCE 7-05 and 7-10 Comparison
ASCE 7-10 Wind Speeds (from new data points) Converted back to current ASD Method
ASCE 7-05 Wind Speeds Using current ASD Method
New Methods - for computing capacities
Allowable Stress Design (ASD)
Ultimate Strength or Load Factor Design (LFD)
Load and Resistance Factor Design (LRFD)
Allowable Stress Design (ASD)
50 lb child on swing OK
Swing breaks at 100 lb
divide by a safety factor of 2.0
100 lb / 2.0
= 50 lb is the “Allowable” load
=
Ultimate Load or Load Factor Design (LFD)
50 lb child multiply by a Load (safety) Factor 2.0
50 lb x 2.0 = 100 lb OK
Swing breaks at 100 lb
= 100 lb is the “Ultimate” load
=
Ultimate Load or Load Factor Design (LFD)
80 lb sack of potatoes multiply by a Load (safety) Factor 1.2
80 lb x 1.2 = 100 lb OK
Swing breaks at 100 lb
= 100 lb is the “Ultimate” load
=
ASCE 7-10 New Wind Speed Maps
Strength Design (wind load factor = 1.0) Category II buildings – 700 year return period wind
speed Category III and IV buildings – 1700 year return
period wind speeds Category I buildings – 300 year return period wind
speeds
Serviceability maps (10, 25, 50 and 100 year) to be added to commentary
49
Risk Category Three maps Map used to determine basic wind
speed depends on building Risk Category
Risk Category formerly known as Occupancy Category
Table 1604.5 of FBC-B or Table 1.5-1 of ASCE 7-2010
ASCE 7-10 New Wind Speed Maps
Implications Net wind loads are decreasing Windborne debris areas shift
53
54
55
56
57
58
Wind speeds at selected locations Location 6.1/700V
ASCE 7-05 Exposure C
Exposure C Exposure D Bar Harbor, Maine 97 95 103 Boston, MA 106 103 112 Hyannis, MA 117 112 122 New Port, RI 117 109 119 Southampton, NY 120 110 119 Atlantic City, NJ 114 102 111 Wrightsville Beach, NC 132 119 129 Folly Beach, SC 131 115 125 Miami Beach 145 136 148 Clearwater, FL 128 115 125 Panama City, FL 129 107 116 Biloxi, MS 138 129 140 Galveston, TX 131 119 129 Port Aransas, TX 134 117 127 Hawaii 105 103 112 Guam 170 155 168
FBC Wind Maps Figure 1609A
Figure 1609B
Figure 1609C
Figure R301.2(4)
63
HVHZ Basic Wind Speeds Miami-Dade County Risk Cat I Buildings and
Structures: 165 mph
Risk Cat II Buildings and Structures : 175 mph
Risk Cat III and IV Buildings and Structures : 186 mph 64
HVHZ Basic Wind Speeds Broward County Risk Category I Buildings and
Structures: 156 mph Risk Category II Buildings and
Structures: 170 mph Risk Category III and IV Buildings
and Structures: 180 mph
65
ASCE 7-10 Reintroduction of Exposure D
Older research and modeling suggested roughness of ocean approached Exposure C with increase in wind speed
Hence ASCE 7-98, -02, and -05 classified water surfaces in hurricane-prone regions as Exposure C
66
ASCE 7-10 Reintroduction of Exposure D
New research suggests otherwise
Roughness of ocean does not continue to increase with increasing wind speed.
67
ASCE 7-10 Reintroduction of Exposure D
Surface Roughness C: Open terrain with scattered obstructions having heights generally less than 30 ft (9.1 m). This category includes flat open country, and grasslands, and all water surfaces in hurricane prone regions.
68
ASCE 7-10 Reintroduction of Exposure D
Surface Roughness D: Flat, unobstructed areas and water surfaces. This category includes smooth mud flats, salt flats, and unbroken ice.
69
ASCE 7-10 Exposure D
Exposure D: Exposure D shall apply where the ground surface roughness, as defined by Surface Roughness D, prevails in the upwind direction for a distance greater than 5,000 ft (1,524 m) or 20 times the building height, whichever is greater. Exposure D shall also apply where the ground surface roughness immediately upwind of the site is B or C, and the site is within a distance of 600 ft (183 m) or 20 times thenbuilding height, whichever is greater, from an Exposure D condition as defined in the previous sentence. For a site located in the transition zone between exposure categories, the category resulting in the largest wind forces shall be used
70
Exposure D (ASCE 26.7; FBCB 1609.4.3 )
Exposure D if structure is adjacent to a Water Surface that is > 5000 ft wide Atlantic St. John’s River
All structures 600 feet from the Exposure D shoreline shall be designed for Exposure D
All other areas of HVHZ are Exposure C
600 feet from shoreline design for
B or C Terrain
D Terrain
Shoreline
Exposure D
Design for Exposure C
900 feet
Wind-Borne Debris Region Vult = 130 mph or greater Within one mile of mean high water
line. Vult > 140 mph All areas
ASCE 7-10 New Wind-Borne Debris Region
WIND-BORNE DEBRIS REGIONS: Areas within hurricane prone regions located:
1. Within 1 mile of the coastal mean high water line where the basic wind speed, for the building category under consideration, is equal to or greater than 130 110 mph and in Hawaii, or
2. In areas where the basic wind speed, for the building category under consideration, is equal to or greater than 140 120 mph.
74
ASCE 7-10 New Wind-Borne Debris Region
Wind speeds for designating WBDR determined by Risk Category Maps
Fig. 1609A - Category II & III buildings, Except Cat III healthcare
Fig, 1609B - Category IV & Category III healthcare
75
79
Proposed New Wind-borne Debris Region
80
Proposed New Wind-borne Debris Region
Courtesy Nanette Lockwood, Solutia Inc.
Actual Differences in Design: Window and Door Pressures
Stucco over Framed Walls
Truss Uplifts
Roof Sheathing
Shear Walls
Typical Window and Door Pressures in Exposure B:
Current DP 35 psf
New DP 24 psf - 30% Decrease
Current DP 25 psf
New DP 17 psf
- 30% Decrease
3060
16070
Stucco over Framed Walls 2x4 SPF #2 @16” o.c. Exp B
9’ PL Current Code 120 mph Exp B 10’ PL New Code 130 mph
Stucco over Framed Walls 2x4 SPF #2 @16” o.c. Exp C
8’ PL Current Code 120 mph Exp C 9’ PL New Code 130 mph
Stucco over Framed Walls 2x6 SPF #2 @16” o.c. Exp B
14’ PL Current Code 120 mph Exp B 16’ PL New Code 130 mph
Stucco over Framed Walls 2x6 SPF #2 @16” o.c. Exp C
12’ PL Current Code 120 mph Exp C 14’ PL New Code 130 mph
Truss Uplift Exposure B Truss Spaced @ 24” o.c.
400 lb Uplift Current Code 120 mph Exp B
200 lb Uplift New Code 130 mph Exp B
40 ft
Girder Truss Uplift Exposure B 7’ Offset Girder Truss
910 lb Uplift Current Code 120 mph Exp B
450 lb Uplift New Code 130 mph Exp B
40 ft
Truss Uplift Exposure C Truss Spaced @ 24” o.c.
750 lb Uplift Current Code 120 mph Exp C
445 lb Uplift New Code 130 mph Exp C
600 lb Uplift New Code 130 mph Exp D
40 ft
Roof Sheathing Requirements
15/32” OSB or 19/32” Plywood for Current Code 120 mph Exp C
7/16” OSB ok for New Code 130 mph Exp C and D
Wind Pressure on a 6:12 Pitch Roof
IRC 2012 R301.2.1Wind limitations. Buildings and portions
thereof shall be limited by wind speed, as defined in TableR301.2(1) and construction methods in accordance with this code. Basic wind speeds shall be determined from Figure R301.2(4)A. The structural provisions of this code for wind loads are not permitted where wind design is required as specified in Section R301.2.1.1 …
IRC 2010 Fig 301.2(4)A
IRC 2012 R301.2.1.1 Wind design required Design criteria. In
regions where wind design is required in accordance with the basic wind speeds from Figure R301.2(4)B equal or exceed 100 miles per hour (45 m/s) in hurricane-prone regions, or 110 miles per hour (49 m/s) elsewhere, the design of buildings for wind loads shall be in accordance with one of the following methods. The elements of design not addressed by those documents in Items 1 through 4 shall be in accordance with this code.
IRC 2012
R301.2.1.2 Protection of openings. Glazing Windows in buildings located in windborne debris regions shall be have glazed openings protected from windborne debris. Glazed opening protection for windborne debris shall meet the requirements of the Large Missile Test of ASTM E 1996 and ASTM E 1886 referenced therein. The applicable wind zones for establishing missile types in ASTM E 1996 are shown on Figure R301.2(4)C. Garage door glazed opening protection for windborne debris shall meet the requirements of an approved impact resisting standard or ANSI/DASMA 115.
IRC 2012 Exp D R301.2.1.4 Exposure category. For each wind direction
considered, an exposure category… (no change)
1.&2. (no change)
3. Exposure C. Open terrain with scattered obstructions, including surface undulations or other irregularities, having heights generally less than 30 feet (9144 mm) extending more than 1500 feet (457 m) from the building site in any quadrant. This exposure shall also apply to any building located within Exposure B type terrain where the building is directly adjacent to open areas of Exposure C type terrain in any quadrant for a distance of more than 600 feet (183 m). This category includes flat open country, and grasslands and shorelines in hurricane prone regions.
IRC 2012 Exp D R301.2.1.4 Exposure category. For each wind direction
considered, an exposure category… (no change)
4. Exposure D. Flat, unobstructed areas exposed to wind flowing over open water (excluding shorelines in hurricane prone regions) for a distance of at least 1 mile (1.61 km). Shorelines in Exposure D include inland waterways, the Great Lakes, and coastal areas of California, Oregon, Washington and Alaska. This exposure shall apply only to those buildings and other structures exposed to the wind coming from over the water. Exposure D extends inland from the shoreline a distance of 1500 feet (457 m) or 10 times the height of the building or structure, whichever is greater.
Test Facilities
102
http://www.youtube.com/watch?v=cXF44jBBwxU&feature=player_detailpage
103
2010 Florida Building Code, Building
Building/Structural Summary
Please complete course evaluations