Quantcast Wind Design Policy

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1) Change in the building's function which results in a significant
increase in the building's level of use, importance, or occupancy.
2)  Significantly extends the building's useful life through
alterations or repairs which total more than 50% of the replacement value
of the facility.
3)  Building or part of the building has been damaged by fire, wind,
earthquake or other cause that structural degradation of the building's
vertical or lateral load carrying systems has occurred.
4)  Building is deemed to be an exceptionally high risk to occupants
or the public at large.
5)  Building is added to the Federal inventory through purchase or
donation for use by the Federal Government.
b.  Seismic Upgrade Guidance.  Interim guidance for rehabilitation,
repair, modernization and seismic safety of existing buildings is provided
by the Naval Facilities Engineering Command, Office of the Chief Engineer
letter HDN/96-115 dated 24 July 1996.  Seismic upgrade shall meet the
demand level of FEMA 185 and as modified in the referenced interim
guidance.
5.19.3  Wind Design Policy.  Wind design criteria shall be in accordance
with the American Society of Civil Engineers (ASCE) 7-95, Minimum Design
Loads for Buildings and Other Structures.  For areas where the basic wind
speed is not identified in ASCE 7-95, use locally available wind data
converted to  a 3-second gust speed at 33 ft above the ground in exposure
category C with an annual probability of 0.02 of being equaled or exceeded
(50-year mean recurrence interval).
5.19.4  Foundation Conditions:  Describe foundation conditions, type of
foundation to be used, method employed to determine bearing values and
maximum dead load and live load soil capacities.  Indicate level of ground
water.  Provide allowable passive and active soil pressures and
co-efficient of friction for retaining wall design.
5.19.5  Type of Construction:  Describe type of construction and framing
adopted, reasons therefor and an economic justification if a choice is
available.  Describe any special or unusual features.
5.19.6  Materials:  State type of material for each major structural unit
and structural system.
5.19.7  Special Features:  Describe special features to be included in the
structure which are not evident from a definitive drawing.
5.19.8  Structural Floor and Roof System:  Describe the structural floor
and roof systems proposed, with length and spacing of principal members
(for beam and girder, etc.), if other than standard drawings are proposed.
5.19.9  Live Loads:  Include a statement of live loading to be used.
Include floor and roof loads, wind and earthquake, and any special loads
with the source of the criteria and data to justify their use.  Include
mooring and deck live loads for waterfront structures.
5-18





 


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