47.5 MB - The Whole Building Design Guide

oof panels were applied over metal purlins. The panels with 3-inch-high trapezoidal ribs at 24 inches on center detached fromtheir concealed clips. A massive quantity of water entered thebuilding and buckled the wood floor.Figure 3-17:A massive quantity ofwater entered the buildingafter the roof blew off.Typhoon Paka (Guam,1997)Wind-borne debris such as roof aggregate, gutters, rooftopequipment, and siding blown from buildings can damage vehiclesand other buildings in the vicinity. Debris can travel wellover 300 feet in high-wind events.Portable classrooms on school campuses are often particularlyvulnerable to significant damage because they are seldom designedto the same wind pressures as permanent buildings.Portable classrooms are frequently blown over during high-windevents, because the anchoring techniques typically used are inadequateto secure the units to the ground. Wind-borne debrisfrom portable classrooms, or an entire portable classroom, maystrike the permanent school building and cause serious damage.Ancillary buildings (such as storage buildings) adjacent to criticalfacilities are also vulnerable to damage. Although loss ofthese buildings may not be detrimental to the operation of thecritical facility, debris from ancillary buildings may strike anddamage the critical facility. The damaged building shown inMAKING CRITICAL FACILITIES SAFE FROM High Wind3-27