FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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Volume II DESIGNING THE FOUNDATION 10 COASTAL CONSTRUCTION MANUAL Figure 10‑20. Pier foundation and spread footing exposed to uplift and lateral forces Several equations exist for designing discrete footings exposed to gravity loads only. Equation 10.5, which models the weight of the footing by reducing the allowable bearing capacity of the soils by the weight of the footing, is used for Example 10-3. Equation 10.5 considers the weight of the pier and footing, the gravity load imposed on the top of the pier, and the allowable soil bearing capacity of the soils to determine footing dimensions. The equation provides the length (L) of a square footing. The equation can be modified for rectangular footings of a given aspect ratio (ratio of width to length) and including in the denominator of the term to the right of the equals sign. Equation 10.5 assumes that the gravity load is equally distributed across the bottom surface of the footing and the soil stresses are constant. This condition is appropriate when the gravity loads are applied at the center of the pier (and the pier is centered on the footing) and when no lateral loads are applied. The foundation system must have sufficient weight to prevent failure when uplift loads are applied. ASCE 7-10 requires the designer to consider only 60 percent of the dead load when designing for uplift (ASD load combination #7). If the foundation is located in an SFHA, portions of it will be located below the stillwater elevation and will be submerged during a design event. The dead load of a material is less when submerged so the submerged weight must be considered (see Section 8.5.7). In Example 10.4, it is assumed that the stillwater depth at the site is 2 feet. 10-39
10 DESIGNING THE FOUNDATION Volume II EQUATION 10.5. DETERMINATION OF SQUARE FOOTING SIZE FOR GRAVITY LOADS EXAMPLE 10.3. PIER FOOTING UNDER GRAVITY LOAD Given: where: L = square footing dimension (ft) P a = gravity load on pier (lb) h col = height of pier above grade (ft) x = distance from grade to bottom of footing (ft) W col = column width (ft) t col = column thickness (ft) w c = unit weight of column and footing material (lb/ft 3 ) q = soil bearing pressure (psf) t foot = footing thickness (ft) • Figure 10-18 • Gravity load on pier (P a ) = 2,880 lb (includes roof live load, live load, and dead load) • Height of pier above grade (h col ) = 4 ft • Distance from grade to bottom of footing (x) = 2 ft • Column width (W col ) = 1.33 ft • Column thickness (t col ) = 1.33 ft • Unit weight of column and footing material (w c ) = 150 lb/ft 3 • Soil bearing pressure (q) = 2,000 psf • Footing thickness (t foot ) = 1 ft • Home is 24 ft x 30 ft consisting of a matrix of 30 16-in. square piers (see Illustration A) • Piers spaced 6 ft o.c. (see Illustration A) 10-40 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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Volume II PRE-DESIGN CONSIDERATIONS
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13 CONSTRUCTING THE BUILDING Volume
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14 MAINTAINING 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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