Current through Vol. 42, No. 1, September 16, 2024
Chapter 16 of the Oklahoma adopted IBC[®] 2018 is adopted
with the following modifications:
(1)
Section 1604.10 Loads on storm shelters. This section has been modified to add
a reference to Section 423.5.3 to point to a change made to that section
related to roof live loads and storm shelters. This section has been modified
to read: 1604.10 Loads on storm shelters. Loads and load combinations on storm
shelters shall be determined in accordance with Section 423.5.3 and ICC
500®.
(2) Figure 1609.3(1)
Basic Wind Speeds, V, for Risk Category II Buildings and Other Structures. The
footnotes to this figure have been modified to correct errata published by the
ICC. The errata corrects the URL reference in footnote number 6 from "www.atcouncil.org/windspeed" to
"www.hazards.atcouncil.org." The
footnotes for this figure have been modified to read: Notes:
(A) Footnote 1. Values are nominal design
3-second gust wind speeds in miles per hour (m divided by s) at 33 feet (10
meters) above the ground for Exposure C category.
(B) Footnote 2. Linear interpolation is
permitted between contours. Point values are provided to aid with
interpolation.
(C) Footnote 3.
Islands, coastal areas, and land boundaries outside the last contour shall use
the last wind speed contour.
(D)
Footnote 4. Mountainous terrain, gorges, ocean promontories, and special wind
regions shall be examined for unusual wind conditions.
(E) Footnote 5. Wind speeds correspond to
approximately a 7 percent probability of exceedance in 50 years (Annual
Exceedance Probability equals 0.00143, MRI equals 700 Years).
(F) Footnote 6. Location-specific basic wind
speeds shall be permitted to be determined using
www.hazards.atcouncil.org.
(3) Figure 1609.3(2)
Basic Wind Speeds, V, for Risk Category III Buildings and Other Structures. The
footnotes to this figure have been modified to correct errata published by the
ICC. The errata corrects the footnotes to include the "N" in the word "Notes"
above the footnotes and to include the footnote numbers cut off in the
printing. Footnote 6 has been modified to change the URL reference from "www.atcouncil.org/windspeed" to
"www.hazards.atcouncil.org." The
footnotes for this figure have been modified to read: Notes:
(A) Footnote 1. Values are nominal design
3-second gust wind speeds in miles per hour (m divided by s) at 33 feet (10
meters) above the ground for Exposure C category.
(B) Footnote 2. Linear interpolation is
permitted between contours. Point values are provided to aid with
interpolation.
(C) Footnote 3.
Islands, coastal areas, and land boundaries outside the last contour shall use
the last wind speed contour.
(D)
Footnote 4. Mountainous terrain, gorges, ocean promontories, and special wind
regions shall be examined for unusual wind conditions.
(E) Footnote 5. Wind speeds correspond to
approximately a 3 percent probability of exceedance in 50 years (Annual
Exceedance Probability equals 0.000588, MRI equals 1700 Years).
(F) Footnote 6. Location-specific basic wind
speeds shall be permitted to be determined using
www.hazards.atcouncil.org.
(4) Figure 1609.3(3)
Basic Wind Speeds, V, for Risk Category IV Buildings and Other Structures. The
footnotes to this figure have been modified to correct errata published by the
ICC. The errata corrects the URL reference in footnote number 6 from "www.atcouncil.org/windspeed" to
"www.hazards.atcouncil.org." The
footnotes for this figure have been modified to read: Notes:
(A) Footnote 1. Values are nominal design
3-second gust wind speeds in miles per hour (m divided by s) at 33 feet (10
meters) above the ground for Exposure C category.
(B) Footnote 2. Linear interpolation is
permitted between contours. Point values are provided to aid with
interpolation.
(C) Footnote 3.
Islands, coastal areas, and land boundaries outside the last contour shall use
the last wind speed contour.
(D)
Footnote 4. Mountainous terrain, gorges, ocean promontories, and special wind
regions shall be examined for unusual wind conditions.
(E) Footnote 5. Wind speeds correspond to
approximately a 1.6 percent probability of exceedance in 50 years (Annual
Exceedance Probability equals 0.00033, MRI equals 3000 Years).
(F) Footnote 6. Location-specific basic wind
speeds shall be permitted to be determined using
www.hazards.atcouncil.org.
(5) Figure 1609.3(1)
Basic Wind Speeds, V, for Risk Category I Buildings and Other Structures. The
footnotes to this figure have been modified to correct errata published by the
ICC. The errata corrects the URL reference in footnote number 6 from "www.atcouncil.org/windspeed" to
"www.hazards.atcouncil.org." The
footnotes for this figure have been modified to read: Notes:
(A) Footnote 1. Values are nominal design
3-second gust wind speeds in miles per hour (m divided by s) at 33 feet (10
meters) above the ground for Exposure C category.
(B) Footnote 2. Linear interpolation is
permitted between contours. Point values are provided to aid with
interpolation.
(C) Footnote 3.
Islands, coastal areas, and land boundaries outside the last contour shall use
the last wind speed contour.
(D)
Footnote 4. Mountainous terrain, gorges, ocean promontories, and special wind
regions shall be examined for unusual wind conditions.
(E) Footnote 5. Wind speeds correspond to
approximately a 15 percent probability of exceedance in 50 years (Annual
Exceedance Probability equals 0.00333, MRI equals 300 Years).
(F) Footnote 6. Location-specific basic wind
speeds shall be permitted to be determined using
www.hazards.atcouncil.org.
(6) Section 1611.1
Design rain loads. This section has been modified to increase secondary drain
size for short duration intensities the equation at the end of the section is
still applicable. This section has been modified to read: 1611.1 Design rain
loads. Each portion of a roof shall be designed to sustain the load of
rainwater that will accumulate on it if the primary drainage system for that
portion is blocked plus the uniform load caused by water that rises above the
inlet of the secondary drainage system at its design flow. The design rainfall
shall be based on a rainfall rate of 10.2 inches per hour.
(A) Equation 16-35
(B) R equals 5.2 (d with a subscript "s" plus
d with a subscript "h")
(C) For
SI: R equals 0.0098 (d with a subscript "s" plus d with a subscript "h") where:
(i) d with a subscript "h" equals Additional
depth of water on the undeflected roof above the inlet of secondary drainage
system at its design flow (in other words, the hydraulic head) in inches (mm).
(ii) D with a subscript "s" equals
Depth of water on the undeflected roof up to the inlet of secondary drainage
system when the primary drainage system is blocked (in other words, the static
head) in inches (mm).
(iii) R
equals Rain load on the undeflected roof, in psf (kN divided by square meters).
Where the phrase "undeflected roof" is used, deflections from loads (including
dead loads) shall not be considered when determining the amount of rain on the
roof.
