FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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Volume II DESIGNING THE FOUNDATION 10 EXAMPLE 10.5. PIER FOOTING UNDER UPLIFT AND LATERAL LOADS (concluded) EQUATION A where: (see Figure 10-20) e = eccentricity Pt = total vertical load for the load combination being analyzed M = applied moment Pl (H + x) (ft-lbs) where x and H are as defined previously P l is the lateral load applied at the top of the column. For equilibrium, R must be applied within the “kern” of the footing (for a square footing, the kern is a square with dimension of L/3 centered about the centroid of the footing). Mathematically, e cannot exceed L/6. Ensuring that the reaction R is applied within the kern of the footing prevents tensile stresses from forming on the edge of the footing. Calculating the minimum soils stress for various footing widths (using a recursive solution) shows that the footing would need to be 11 ft 4 in. wide to prevent overturning. Increasing the footing thickness to 2 feet would allow the footing size to be reduced to approximately 8 ft 9 in. Either design is not practical to construct. 10.9.2 Pier Foundation Summary These analyses indicate that piers with discrete footings are practical to construct when they are required to resist gravity loads only but are not practical when they must resist uplift forces or lateral loads. Although prescriptive designs for pier foundations are available in some codes and standards, users of the codes and standards should ensure that the designs take into account all of the loads the foundations must resist. Prescriptive designs should only be used to resist lateral and uplift loads after they have been confirmed to be adequate. Constructing piers on continuous footings makes pier foundations much more resistant to coastal hazards, but prescriptive designs for piers on continuous footings are not present in widely adopted codes such as the IRC and IBC. Until prescriptive designs using piers are developed, these styles of foundations should be engineered. Continuous footings are discussed in Section 11.1.5 of FEMA 549, Hurricane Katrina in the Gulf Coast (FEMA 2006), and continuous footing designs that can be used for the basis of engineered foundations are contained in FEMA P-550. COASTAL CONSTRUCTION MANUAL 10-45
10 DESIGNING THE FOUNDATION Volume II 10.10 References ACI (American Concrete Institute). 2008. Building Code Requirements for Structural Concrete and Commentary, ACI 318-08. ACI ASCE (American Society of Civil Engineer / TMS (The Masonry Society). 2008. Building Code Requirements and Specifications for Masonry Structures and Related Commentaries, ACI 530-08. AF&PA (American Forest & Paper Association). 2012. Wood Frame Construction Manual for One- and Two-Family Dwellings. Washington, D.C. ANSI (American National Standards Institute) / AF&PA. 2005. National Design Specification for Wood Construction. ASTM (American Society for Testing and Materials). 2005. Standard Specification for Round Timber Piles, ASTM D25-99. ASTM. 2007. Standard Specification for Hot-Formed Welded and Seamless Carbon Steel Structural Tubing. ASTM A501-07. ASTM. 2008. Standard Specification for Carbon Structural Steel. ASTM A36/A36M-08. ASTM. 2009. Standard Practice for Description and Identification of Soils (Visual-Manual Procedure). ASTM D2488-09a. ASTM. 2010a. Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System). ASTM D2487-10. ASTM. 2010b. Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes. ASTM A500-10. ASTM. 2010c. Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. ASTM A53/A53M-10. ASTM. 2010d. Standard Specification for Welded and Seamless Steel Pipe Piles. ASTM 252-10. ASCE (American Society of Civil Engineers). 2010 Minimum Design Loads for Buildings and Other Structures. ASCE Standard ASCE 7-10. AWPA (American Wood Protection Association). 2006. Standard for the Care of Preservative-Treated Wood Products, AWPA M4-06. Bowles, J.E. 1996. Foundation Analysis and Design, 5th Ed. New York: McGraw-Hill. Collin, J.G. 2002. Timber Pile Design and Construction Manual. The Timber Piling Council of the American Wood Preservers Institute. FEMA (Federal Emergency Management Agency). 2006. Recommended Residential Construction for the Gulf Coast. FEMA P-550. FEMA. 2008a. Flood Damage-Resistant Materials Requirements. Technical Bulletin 2. 10-46 COASTAL CONSTRUCTION MANUAL
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Coastal Construction Manual Princip
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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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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 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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