ARCH3355_2013_04_16_Foundation_Design

C 12 36 d d d d 14 step 01 determine initial size

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Unformatted text preview: nitial Size Using 1ft Section [Unfactored]. d d 14” #4 bars [7in o.c.] d d 14” #8 bar [1in dia] d d d 3” cover ld ld 12” 12” #4 bars [7in o.c.] NOTE: Excludes the soil and footing weight as they do not d d contribute to producing moment or shear in the footing. d 14” 3” cover Design Soil Pressure:o.c.] #5 bars [8in #5 bars [8in o.c.] ld d 14” ld #5 bars [8in o.c.] ld qs = 31,500 lb/ft / 7ft = 4,500 lb/ft2 FOUNDATION DESIGN | P. RAAB ARCH3355 | Construction III | Spring 2013 b distance “d” from the face of the wall [critical section for shear] a d/2 3” cover d #5 bars [8in o.c.] compression in top of footing ld FOUNDATION DESIGN | P. RAAB d d column load [P] b distance “d” from the face of the wall [critical section for shear] a d/2 face of wall [critical section for moment] f d 14” d d e 36” d ld U = 1.4DL + 1.7LL 12” U = 1.4(14,000) + 1.7(7,000) U = 31,500 lb/ft 12” Determine Actual Width of Footing: b = Total Load + Footing Weight Allowance / Max Soil Pressure b = [14,000 + 7,000 + 1,050 + 2,400] / 3,500 b = 6.99 ft à༎ USE 7ft WIDE FOOTING 12” d d ld ld weight of footing: 150 lb/ft3 x 7ft x 1ft = 1050 lb/ft of wall length weight of soil: 100 lb/ft3 x 3ft x 4ft x 2 = 2400 lb/ft of wall length column load [P] development length of reinforcing steel Step 02: Determine Design Soil Pressure [Factored] ld #5 bars [8in o.c.] ld Estimate width of footing: #5 bars [8in o.c.] A = [14,000 + 7,000]2 / 3,5002 = 36 ft2; w = √36 = 6ft NOTE: This does not include soil or concrete weight. To determine footing and soil weight assume 7ft width and 12in deep: compression in top of footing 3” cover ld 3” cover ARCH3355 | Construction III | Spring 2013 face of development length of column: [critical reinforcing steel section for moment] Concrete strength: f’c = 3000psi, 12” 12” 12” Steel Strength: fy = 60,000psi, Dead Load: 14,000 lb/ft of wall length, Live Load: #8 bar [1in dia] 7,000 lb/ft of wall length, 2 Max Soil Pressure: 5’ below grade lb/ft d 3,500 12” 5’ below grade d d tension reinforcing Find the required depth, width, and reinforcement for the following load: 12” d effective depth “d” is the distance from top of the footing to the centroid of the reinforcing steel ld tension in bottom of footing Find the required depth, width, and reinforcement for the following load: Concrete strength: Steel Strength: Dead Load: Live Load: Max Soil Pressure: d 3” cover Designing Wall Footings: Example ld tens...
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This note was uploaded on 02/04/2014 for the course ARCH 3355 taught by Professor Staff during the Spring '08 term at Texas Tech.

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