FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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Volume II DETERMINING SITE-SPECIFIC LOADS 8 EXAMPLE 8.5. ROOF UPLIFT CONNECTOR LOADS (continued) • For ASD, multiply by the ASD wind load factor of 0.6, which comes from Load Combination 7 (See Section 8.10) 0.6D + 0.6W: The largest uplift forces occur for a roof slope of 20 degrees where wind is perpendicular to the ridge. The addition of an overhang also increases the roof-to-wall uplift connection load. For the windward overhang, a pressure coefficient of 0.68 is used based on the gust factor of 0.85 and pressure coefficient of 0.80 from ASCE 7-10. Otherwise, pressure coefficients for other elements of the roof are based on GC pi = 0.18 and GC pf from the edge zone coefficients shown in Figure 28.4-1 of ASCE 7-10. Pressures and moments given below contain subscripts for their location: • W = windward • L = leeward • O = overhang • R = roof The design wind pressure is determined from Equation 8.14 as follows: • The roof/ceiling dead load is adjusted for the load case where dead load is used to resist uplift forces as follows: Dead load where 0.6 is the ASD load factor for dead load in the applicable load combination • Wind loads on the roof have both a horizontal and vertical component. The uplift connector force, located at the windward wall, can be determined by summing moments about the leeward roof-to-wall connection and solving for the connector force that will maintain moment equilibrium. Clockwise moments are considered positive. Moment (M) created by windward overhang pressures is solved as follows: Vertical component, windward overhang (VWO): COASTAL CONSTRUCTION MANUAL 8-55
8 DETERMINING SITE-SPECIFIC LOADS Volume II EXAMPLE 8.5. ROOF UPLIFT CONNECTOR LOADS (continued) Horizontal component, windward overhang (HWO): Moment (M) created by windward roof pressures is solved as follows: Vertical component, windward roof (VWR): Horizontal component, windward roof (HWR): Moment (M) created by leeward roof pressures is solved as follows: Vertical component, leeward roof (VLR): Horizontal component, leeward roof (HLR): Moment(M) created by leeward overhang pressures is solved as follows: Vertical component, leeward overhang (VLO): Horizontal component, leeward overhang (HLO): The total overturning moment per ft of roof width = 10,174.3 ft-lb 8-56 COASTAL CONSTRUCTION MANUAL
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Coastal Construction Manual Princip
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All illustrations in this document
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PREFACE Volume II Chapter 8 - Site-
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1 CHAPTER TITLE Contents COASTAL CO
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Volume II CONTENTS Chapter 9. Desig
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Volume II CONTENTS Chapter 11. Desi
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Volume II CONTENTS 12.5 Water and W
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Volume II CONTENTS 15.4.1 Evaluatin
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Volume II CONTENTS Figure 9-10. Roo
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Volume II CONTENTS Figure 11-3. Hou
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Volume II CONTENTS Figure 11-47. Da
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Volume II CONTENTS Chapter 15 Figur
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Volume II CONTENTS Table 10-9. Adva
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Volume II CONTENTS Example 8.4. Flo
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1 CHAPTER TITLE COASTAL CONSTRUCTIO
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Volume II PRE-DESIGN CONSIDERATIONS
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12 INSTALLING MECHANICAL EQUIPMENT
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13 CONSTRUCTING THE BUILDING Volume
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14 MAINTAINING THE BUILDING Volume
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Volume II RETROFITTING BUILDINGS FO
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1 CHAPTER TITLE Acronyms COASTAL CO
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Volume II ACRONYMS H HMA Hazard Mit
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Volume II ACRONYMS T TMS The Masonr
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GLOSSARY Volume II Basement - Under
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GLOSSARY Volume II Conditions Great
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GLOSSARY Volume II F Federal Emerge
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GLOSSARY Volume II G Gabion - Rock-
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GLOSSARY Volume II Location - The l
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GLOSSARY Volume II O Open foundatio
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GLOSSARY Volume II Risk tolerance -
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GLOSSARY Volume II safe living cond
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GLOSSARY Volume II Z Zone A - Under
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INDEX Volume II Building envelope,
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INDEX Volume II stillwater flood de
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INDEX Volume II Floodborne debris d
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INDEX Volume II I IBHS (see Insuran
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INDEX Volume II date of constructio
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INDEX Volume II Seawall, 7-7, 7-17,
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INDEX Volume II velocity pressure,
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FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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