FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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Volume II DESIGNING THE BUILDING 9 9.2 Other Load Path Considerations Several additional design considerations must be investigated in order for a design to be complete. The details of these investigations are left to the designer, but they are mentioned here to more thoroughly cover the subject of continuous load paths and to point out that many possible paths require investigation. Using the example of the building shown in Example 9.3, Illustration A, the following load paths should also be investigated: Load paths for shear transfer between shear walls and diaphragms including uplift due to shear wall overturning Gable wall support for lateral wind loads Uplift of the front porch roof Uplift of the main roof section that spans the width of the building Other factors that influence the building design and its performance are: Connection choices Building eccentricities Framing system Roof shape 9.2.1 Uplift Due to Shear Wall Overturning The shear wall that contains Link #6 includes connections designed to resist overturning forces from wind acting perpendicular to the ridge (see Example 9.7, Illustration A). Calculation of the overturning induced uplift and compressive forces are given in Example 9.7. EXAMPLE 9.7. UPLIFT AND COMPRESSION DUE TO SHEAR WALL OVERTURNING Given: • Refer to Illustration A • Wind speed = 150 mph, Exposure D • Mean roof height = 33 ft • Roof span perpendicular to ridge = 28 ft • Roof pitch = 7:12 • Wall height = 10 ft COASTAL CONSTRUCTION MANUAL 9-21
9 DESIGNING THE BUILDING Volume II EXAMPLE 9.7. UPLIFT AND COMPRESSION DUE TO SHEAR WALL OVERTURNING (continued) Illustration A. Loads on south shear wall Find: Uplift and compressive force due to shear wall overturning. Solution: The uplift and compressive force due to shear wall overturning can be determined as follows: • The total shear force due to wind acting perpendicular to the ridge is determined for the 28-ft roof span by interpolation from Table 8-7: Roof diaphragm load for 24-ft roof span = 256 plf Roof diaphragm load for 32-ft roof span = 299 plf Adjusting the roof diaphragm load to account for the building being located in Exposure Category D: 1.18(278 plf) = 328 plf To adjust w roof for a wall height of 10 ft because Table 8.7 assumes a wall height of 8 ft 9-22 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 12.5 Water and W
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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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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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