NEEDED 2010 FLORIDA BUILDING CODE FIXES – Structural: RULE 61G20 -1.001

TEXT

RATIONALE

Florida Building Code, Building

Chapter 16 - Structural Design

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FIGURE 1609A ULTIMATE DESIGN WIND SPEEDS, V_altult FOR RISK CATEGORY II BUILDINGS AND OTHER STRUCTURES

FIGURE 1609B ULTIMATE DESIGN WIND SPEEDS, V_altult FOR RISK CATEGORY III AND IV BUILDINGS AND OTHER STRUCTURES

FIGURE 1609C ULTIMATE DESIGN WIND SPEEDS, V_altult FOR RISK CATEGORY I BUILDINGS AND OTHER STRUCTURES

Editorial – change “alt” to “ult”

Criteria a. Conflicts within the updated code

TAC Comment – Glitch

Vote – unanimous approval.

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1609.7 Garage doors and rolling doors.
Pressures from Table 16049.7(1) for wind loading actions on garage doors and rolling doors for buildings designed as enclosed shall be permitted.

Editorial – correct reference section.

Conflicts within the updated code.

TAC Comment – Glitch

Vote – unanimous approval.

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Add Section 1612.4.1 as follows:

1612.4.1 Modification to ASCE 24-05. Table 6-1 and Section 6.2.1 in ASCE 24 shall be modified as follows:

1. The title of Table 6.1 shall be “Minimum Elevation of Floodproofing, Relative to Base Flood Elevation (BFE) or Design Flood Elevation (DFE), in Coastal A Zones and in Other Flood Hazard Areas that are Not – [RCQ1] [RCQ1]Outside of High Risk Flood Hazard Areas.”

Section 6.2.1 shall be modified to permit dry floodproofing in Coastal A Zones, as follows: “Dry floodproofing of nonresidential structures and nonresidential areas of mixed-use structures shall not be allowed unless such structures are located outside of High Risk Flood Hazard areas, and Coastal High Hazard Areas, and Coastal A Zones. Dry floodproofing shall be permitted in Coastal A Zones provided wave loads and the potential for erosion and local scour are accounted for in the design.”

[Remaining text unchanged]

The proposed code change is within glitch criteria permitted for inconsistencies with federal regulations.

Summary of modification:

Permit dry floodproofing of nonresidential buildings in flood hazard areas identified as Coastal A Zones if designed in accordance with ASCE 24 to account for wave loads and the potential for erosion and local scour.

Many beaches of Florida coast are designated as Zone V (Coastal High Hazard Area) on FEMA Flood Insurance Rate Maps. The landward limit of Zone V is where waves predicted to occur during the base flood fall below 3-ft in height. Inland of these areas are flood hazard areas where conditions during the base flood develop waves between 1.5 ft and 3 ft high; these areas are called Coastal A Zones for the purpose of designing and constructing buildings within the scope of the 2010 Florida Building Code, Building. Over the past 30-40 years many Florida communities have, as allowed under Federal regulations for the NFIP, permitted dry floodproofing measures to be used for nonresidential buildings located in these areas now called Coastal A Zones. Experience has shown these measures, if properly designed, protect against base flood conditions. The proposed code change authorizes the continued use of dry floodproofing measures in accordance with the standard referenced by Section 1612.4 (ASCE 24, Flood Resistant Design and Construction). This code change will allow small businesses to dry floodproof buildings in Coastal A Zones, which increases the options available for providing the required level of protection.

Submitted by Rebecca Quinn on behalf of Joy Duperault of DEM

For more details, see Attachment #1

TAC Comment – Not a Glitch

Vote – unanimous approval.

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1609.1.2.4 Modifications to ASTM E 1996. Section 6.2.2 of ASTM E 1996 shall be modified as follows:

6.2.2 Unless otherwise specified, select the wind zone based on the basic wind speed as follows:

6.2.2.1WindZone 1 - 130 mph ≤ basic wind speed < 140 mph, and Hawaii.

6.2.2.2 Wind Zone 2 - 140 mph ≤ basic wind speed < 150 mph at greater than 1.6 km (one mile) from the coastline. The coastline shall be measured from the mean high water mark.

6.2.2.3 Wind Zone 3 - 150 mph (58 m/s?) ≤ basic wind speed < 160 mph (63 m/s?), or 140 mph (54 m/s?) ≤ basic wind speed ≤ 160 170 mph (63 m/s?) and within 1.6 km (one mile) of the coastline. The coastline shall be measured from the mean high water mark.

6.2.2.4 Wind Zone 4-basic wind speed > 160 170 mph (63 m/s?).

Unintended results from the integration of previously adopted Florida-specific amendments with the model code.

The intent of the change was to correlate the provisions of ASTM E 1996 and the ultimate wind speeds of ASCE 7-2010 within the code. There was no intention to expand Wind Zone 4 into new areas of the State. The correlating change does much more than correlate the code by expanding Wind Zone 4 provisions for impact resistive systems intended for Miami-Dade County into more areas of the State than intended by ASTM.

Submitted by Joe Belcher

For more details, see Attachment #2

TAC Comment – Glitch

Vote – unanimous approval.

Ensure metric conversions are correct.

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FBC, Residential

R301.2.1.2.1 Modifications to ASTM E 1996. Section 6.2.2 of ASTM E 1996 shall be modified as follows:

6.2.2 Unless otherwise specified, select the wind zone based on the basic wind speed as follows:

6.2.2.1WindZone 1 - 130 mph ≤ basic wind speed < 140 mph, and Hawaii.

6.2.2.2 Wind Zone 2 - 140 mph ≤ basic wind speed < 150 mph at greater than 1.6 km (one mile) from the coastline. The coastline shall be measured from the mean high water mark.

6.2.2.3 Wind Zone 3 - 150 mph (58 m/s) ≤ basic wind speed < 160 mph (63 m/s), or 140 mph (54 m/s) ≤ basic wind speed ≤ 160 170 mph (63 m/s) and within 1.6 km (one mile) of the coastline. The coastline shall be measured from the mean high water mark.

6.2.2.4 Wind Zone 4-basic wind speed > 160 170 mph (63 m/s).

Same as above.

Unintended results from the integration of previously adopted Florida-specific amendments with the model code.

For more details, see attachment #3

TAC Comment – Glitch

Vote – unanimous approval.

Ensure metric conversions are correct.

6

Revise Tables 2308.9.5, 2308.9.6, 2308.10.2(1), 2308.10.2(2), 2308.10.3(1), and 2308.10.3 (2).

Chapter 35

NDS-	05 National Design Specification (NDS) or Wood Construction with 2005 Supplement and March 2012 Addendum
Chapter	43 (FBC, Residential)
NDS-	05 National Design Specification (NDS) for Wood Construction with 20015 Supplement and March 2012 Addendum

Equivalency of standards

In response to recent grading agency requests and after evaluation of applicable testing programs and results, the American Lumber Standards Committee has certified new design values for Southern Pine 2x4s, No. 2 and lower grades, effective June 1, 2012 (2x4s only).  These modifications are needed to reflect these new design values. Comprehensive information about the need for and application of the new design values can be found at the websites of the Southern Pine Inspection Bureau and the Southern Forest Products Association (www.spib.org, and www.southernpine.com).

For more details, see attachment #4

Submitted by Paul Coats/American Wood Council.

TAC Comment – Glitch

Vote – unanimous approval.

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FBC, Residential – Chapter 43

Delete “ 1997 Guide to Wood Construction in High-Wind Areas”

Conflicts within the updated code

Editorial - This guide is no longer referenced in the Florida Building Code, and was replaced by the guide associated with the AF&PA Wood Frame Construction Manual, which is correctly referenced under AF&PA

For more details, see attachment #5

Submitted by Paul Coats/American Wood Council.

TAC Comment – Glitch

Vote – unanimous approval.

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[RCQ1]Mo – this is intended to be strike-thru of the dash that is in the current Table 6-1 title