47.5 MB - The Whole Building Design Guide

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Internal pressure (building pressurization/depressurization): Openingsthrough the building envelope, in combination with wind interactingwith a building, can cause either an increase in thepressure within the building (i.e., positive internal pressure),or it can cause a decrease in the pressure (i.e., negative internalpressure). Building envelope openings occur around doors andwindow frames, and by air infiltration through walls that are notabsolutely airtight. A door or window left open, or glazing that isbroken during a storm, can greatly influence the magnitude ofthe internal pressure.Wind striking an exterior wall exerts a positive pressure on thewall, which forces air through openings and into the interior ofthe building (this is analogous to blowing up a balloon). At thesame time that the windward wall is receiving positive pressure,the side and rear walls are experiencing negative (suction) pressurefrom winds going around the building. As this occurs, airwithin the building is pulled out at openings in these walls. Asa result, if the porosity of the windward wall is greater than thecombined porosity of the side and rear walls, the interior of thebuilding is pressurized. But if the porosity of the windward wall islower than the combined porosity of the side and rear walls, theinterior of the building is depressurized (this is analogous to lettingair out of a balloon).When a building is pressurized, the internal pressure pushes upon the roof. This push from below the roof is combined with suctionon the roof above, resulting in an increased upward windpressure on the roof. The internal pressure also pushes on theside and rear walls. This outward push is combined with the suctionon the exterior side of these walls (see Figure 3-6). When abuilding becomes fully pressurized (e.g., due to window breakageor soffit failure), the loads applied to the exterior walls and roofare significantly increased. The rapid build-up of internal pressurecan also blow down interior partitions and blow suspendedceiling boards out of their support grid. The breaching of a smallwindow can be sufficient to cause full pressurization of the facility’sinterior.MAKING CRITICAL FACILITIES SAFE FROM High Wind3-11
Figure 3-6:Schematic of internalpressure condition when thedominant opening is in thewindward wallWhen a building is depressurized, the internal pressure pulls theroof down, which reduces the amount of uplift exerted on theroof. The decreased internal pressure also pulls inward on thewindward wall, which increases the wind load on that wall (seeFigure 3-7).The ASCE 7 wind pressure design procedure accounts for the influenceof internal pressure on the wall and roof loads, and itprovides positive and negative internal pressure coefficients for3-12 MAKING CRITICAL FACILITIES SAFE FROM High Wind
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Risk Management SeriesDesign Guidef
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Any opinions, findings, conclusions
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ational during and after a major di
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TARGET AUDIENCEThis manual describe
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Appendix A contains a list of acron
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Forster, FEMA; David Godschalk, Uni
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Chapter 2- Making Critical faciliti
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2.4.6 Utility Installations .......
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4.4.8 Utility Plumbing Systems.....
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avoid them when feasible. In cases
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It then crossed Florida into the Gu
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Figure 1-2: Mississippi coast SLOSH
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isks for the facility at the propos
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m Appoint a building program manage
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-Figure 1-3: Process flow chart for
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hazards, usually refers to a buildi
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occurrence during a specified time
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ut is moderate overall. Some hazard
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words, the acceptable performance o
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prior to the onset of this level of
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1.4 REFERENCESAmerican Society of C
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MAKING CRITICAL FACILITIES SAFE FRO
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m Land subsidence, which increases
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valley or the presence of obstructi
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2.1.1.1 Probability of Occurrence o
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year, a very low probability flood
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m FIRMs and Flood Insurance Studies
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Figure 2-3: Riverine flood hazard z
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have been prepared by the U.S. Army
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ABFEs represent the best estimate o
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The following characteristics that
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Figure 2-7 shows the general relati
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2.1.2.5 Hydrodynamic LoadsWater flo
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stillwater depth) and that waves pr
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Debris velocity: The velocity of th
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The most convincing evidence of the
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2.1.3.2 Summary of the NFIP Minimum
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complished through a State permit,
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Developed through a consensus proce
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2.2 CRITICAL FACILITIES EXPOSED TOF
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listed includes health hazards, los
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overview on performance-based desig
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Figure 2-12:Katrina’s storm surge
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Buoyancy and uplift: If below-grade
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acceptable, depending on the type o
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Metal components: Metal structural
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Emergency power generators: Generat
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Office records and police files: Wh
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2.3 REQUIREMENTS AND BESTPRACTICES
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terior drainage (on the land side);
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Slab-on-grade foundation on structu
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and debris and ice impact loads. Fl
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Page 116 and 117: Figure 2-30:Flood hazard zones inco
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Page 122 and 123: 2.3.5.4 Storage Tank InstallationsA
Page 124 and 125: 2.4.2 SITE MODIFICATIONSA plan to m
Page 126 and 127: Mobilized floodwall: This category
Page 128 and 129: methods used to move other types of
Page 130 and 131: Even if a facility is unlikely to s
Page 132 and 133: Wastewater system components become
Page 134 and 135: Emergency barriers are measures of
Page 136 and 137: 2.5 CHECKLIST FOR BUILDINGVULNERABI
Page 138 and 139: Table 2-3: Checklist for Building V
Page 146 and 147: FEMA, Protecting Building Utilities
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Page 154 and 155: Figure 3-3: Design wind speeds for
Page 156 and 157: Exposure: The characteristics of th
Page 160 and 161: Figure 3-7:Schematic of internalpre
Page 162 and 163: Figure 3-8: Relative roof uplift pr
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Page 166 and 167: spread in both of those storms. Pri
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Page 170 and 171: 3.2 CRITICAL FACILITIES EXPOSED TOH
Page 172 and 173: Wall coverings, soffits, and large
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Page 176 and 177: 3.2.2 Evaluating Critical Facilitie
Page 178 and 179: Step 2: Perform a field investigati
Page 180 and 181: 3.3.1.1 SiteWhen selecting land for
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Page 184 and 185: As part of the detailed design effo
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Page 188 and 189: a window submittal should show that
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Page 192 and 193: Figure 3-23:View looking down at th
Page 194 and 195: m For buildings that have mechanica
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Page 198 and 199: Figure 3-31:Door sill pan flashing
Page 200 and 201: Adjustable jamb/head weatherstrippi
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Page 204 and 205: Soffits: Depending on the wind dire
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Figure 3-47:These four ties werenev
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m Install ties as the brick is laid
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At the hospital shown in Figure 3-5
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etween the hospital and the medical
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metal panels were attached with con
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avoid blow-off. Stainless steel or
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If the roof system is fully adhered
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Figure 3-60:View of the underside o
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ities. For FMG-insured facilities,
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Figure 3-65:The original modifiedbi
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Figure 3-66:If mechanically attache
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Loads and Attachment Methods 9Infor
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Fan cowling attachment: Fans are fr
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Condenser attachment: In lieu of pl
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Boiler and exhaust stack attachment
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Figure 3-78:Collapsed hospital ligh
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Figure 3-80:The antenna tower atthi
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Table 3-3: Risk Reduction Design Me
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Table 3-3: Risk Reduction Design Me
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Chapter 4 for information on the pe
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Figure 3-83:Open walkways donot pro
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ASTM E 1996 specifies five missile
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ASCE 7 refers to ASTM E 1996 for mi
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For interior non-load-bearing mason
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m For structural metal roofs, it is
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Mechanically attached and air-press
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Figure 3-92:To avoid walkway padblo
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3.4.4.2 Mechanical PenthousesBy pla
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To enhance the wind performance of
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Mechanically attached single-ply me
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to power generation stations and by
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occupants can have bottled water pr
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Table 3-4: Recommendations for Desi
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Strong and violent tornadoes can ge
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For critical facilities located in
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Retrofitting a shelter space inside
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funds are not available for strengt
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Figure 3-106:The school’s built-u
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3.6.2 Building EnvelopeThe followin
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Shutters are typically a more econo
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semblies with laminated glass assem
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Figure 3-116:The edge nailer on top
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Figure 3-118:The antenna at thishos
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3.7 Checklist for BuildingVulnerabi
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Table 3-8: Checklist for Building V
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Table 3-8: Checklist for Building V
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3.8 References and Sources ofAdditi
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American Society for Testing and Ma
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FEMA, Attachment of Brick Veneer in
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accompanied with suggestions on pos
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Hurricane Katrina emphasized the fa
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The water supply was interrupted an
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Hancock Medical Center in Bay St. L
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Figure 4-4:Penthouse at the WestJef
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Figure 4-6:Repair of EIFS wallcover
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The primary cause of window breakag
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West Jefferson Medical Center lost
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4.2.8 Mechanical and ElectricalSyst
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covering the fill cap and all vent
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emergency communications frequently
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mary and West Jefferson Medical Cen
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4.3 EDUCATIONAL FACILITIES4.3.1 Bac
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4.3.2 Effects of FloodingThe most d
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Figure 4-17:Broken windows atD’Ib
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St. Stanislaus High School in Bay S
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4.3.6 Structural SystemsMost of the
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The St. Stanislaus High School camp
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Figure 4-27:Metal roof covering pee
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ment, especially HVAC systems, was
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Figure 4-30:Interior damage at Char
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m Doors should be designed to meet
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different, most of them require and
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4.4.3 Effects of High WindsThe high
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Figure 4-33:Jackson County EOCFigur
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them experienced significant proble
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Figure 4-37:Back Bay Fire Company#3
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Figure 4-39:Gulfport Fire Station #
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Third District Fire Station in New
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Figure 4-44:Roof damage at HancockC
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underground tank for toilets and wa
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Figure 4-47:Generator mounted atgra
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Figure 4-49:Broken communicationsma
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erate without adequate emergency po
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FISFMAFMGFMRHMGPIBCICCICULPSMEPSMOB
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Building, enclosed. A building that
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Floodway. The channel and that port
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OOpenings. Apertures or holes in th
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FEMA Mitigation ProgramscFederal fu
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Table 1: Side-by-Side of FEMA Progr
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todial care facilities (including t
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aged windows with impact-resistant
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tions, and wastewater treatment pla
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47.5 MB - The Whole Building Design Guide

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