47.5 MB - The Whole Building Design Guide

Table 3-3: Risk Reduction Design MethodsSite and General Design See Section 3.3.1ExposurePresence of trees or polesSite accessLocate in Exposure B if possible. Avoid escarpments andupper half of hills.Locate to avoid blow-down on facility.Minimum of two roads.General design issues See recommendations in Section 3.3.1.2.Wind loads on MWFRS, building envelope androoftop equipmentLoad resistanceDurabilityRain penetrationUse ASCE 7 or local building code, whichever procedureresults in highest loads.Determine via calculations and/or text data. Give loadresistance criteria in contract documents, and clearly indicateload path continuity.Give special attention to material selection and detailingto avoid problems of corrosion, wood decay, and termiteattack.Detail to minimize wind-driven rain penetration into thebuilding.Structural Systems (MWFRS) See Section 3.3.2Pre-engineered metal buildingsExterior load-bearing wallsRoof decksTake special steps to ensure structure is not vulnerable toprogressive collapse.Design as MWFRS and C&C. Reinforce CMU. Sufficientlyconnect precast concrete panels.Concrete, steel, or wood sheathing is recommended. Attachsteel decks with screws. Use special fasteners for woodsheathing. Anchor precast concrete to resist wind loads. IfFMG-rated assembly, deck must comply with FMG criteria.Walkways and canopies Use pressure coefficients from ASCE 7.Exterior Doors See Section 3.3.3.1Door, frame, and frame fastenersMust be able to resist positive and negative design load,verified by ASTM E 1233 testing. Specify type, size, andspacing of frame fasteners.Water infiltrationConsider vestibules, door swing, and weatherstripping. Referto ASTM E 2112 (2001) for design guidance.MAKING CRITICAL FACILITIES SAFE FROM High Wind3-95