ARCH3355_2013_04_16_Foundation_Design

Strength steel strength dead load live load max soil

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Unformatted text preview: ollowing load: Concrete strength: Steel Strength: Dead Load: Live Load: Max Soil Pressure: effective depth “d” is the distance from top of the footing to the centroid of the reinforcing steel ld d Designing Wall Footings: Example upward soil pressure d 3” cover one-way shear line ld 3” cover FOUNDATION DESIGN | P. RAAB d d d 14” #5 bars [8in o.c.] ld ARCH3355 | Construction III | Spring 2013 d d 14” #5 bars [8in o.c.] ld 3” cover d 14” #5 bars [8in o.c.] ld FOUNDATION DESIGN | P. RAAB 2 4/25/13 compression in top of footing d d column load [P] b distance “d” from the face of the wall [critical section for shear] a d/2 e g face of wall [critical section for moment] f h d two-way or punching shear line 3” cover one-way shear line c tension reinforcing Designing Wall Footings: Example face of column: [critical section for moment] development length of reinforcing steel 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: f’c = 3000psi, 12” fy = 60,000psi, 14,000 lb/ft of wall length, 7,000 lb/ft of wall length, 3,500 lb/ft2 12” 36” 5’ below grade #8 bar [1in dia] d d d Step 05: Find the Steel Required: d ld a = Asfy / 0.85fcb [As is unknown à༎ Try a = 1inch] f’c = 3000psi, fy = 60,000psi, 14,000 lb/ft of wall length, 7,000 lb/ft of wall length, 3,500 lb/ft2 Step 05: Find the Steel Required [continued]: l See Reference Table for values / spacing of reinforcing bars: d 12” a = depth of the rectangular stress block, determined by: compression in top of footing Concrete strength: Steel Strength: Dead Load: Live Load: Max Soil Pressure: d 3” cover ld As = Mu / [Φfy(d – a/2)] column load [P] 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 d Designing Wall Footings: Example upward soil pres...
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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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