Principles of Foundation Engineering
9th Edition
ISBN: 9780357684832
Author: Das
Publisher: Cengage Learning US
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Chapter 17, Problem 17.4P
To determine
Find the factor of safety of the retaining wall for overturning and sliding.
Find the soil pressure at the toe and the heel.
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A 300 mm thick, 2.0 m wide footing slab supports a 200 mm thick concrete wall carrying uniform service dead load of 215 kN/m and service live load of 145 kN/m. Using f’c = 21 MPa and fy = 420 MPa. use flexure bar = 16mm.
1. calculate the ultimate shear force per 1-m-strip of footing slab at critical section
2. calculate the design shear strength of 1-m strip concrete footing slab
3. calculate the maximum factored wall wall that can be sustained by the footing slab based on shear strength only
For the loaded area shown below, determine the increase in vertical stress (4p) at 5 ft below points B and C at the
depth of the pipe, which is z = 5 feet below the footing, and 3 feet a way from its edge. The footing has a UDL , q
= 1800 lb/ft2.
1,800
B.
A
5t
4ft
5t
2 B
10 t
3 ft
10 ft
3 ft
PLAN VIEW
SECTION
4.17. A rectangular beam made using concrete with f c ′ = 6000 psi and steel with
f y = 60,000 psi has a width b = 20 in., an effective depth of d = 17.5 in., and
a total depth of h = 20 in. The concrete modulus of rupture f r = 530 psi. The
elastic moduli of the concrete and steel are, respectively, E c = 4,030,000 psi
and E s = 29,000,000 psi. The tensile steel consists of four No. 11 (No. 36) bars.
( a ) Find the maximum service load moment that can be resisted without
stressing the concrete above 0 .45 f c′ or the steel above 0.40 f y .
( b ) Determine whether the beam will crack before reaching the service load.
( c ) Compute the nominal flexural strength of the beam.
( d ) Compute the ratio of the nominal flexural strength of the beam to the maximum
service load moment, and compare your findings to the ACI load
factors and strength reduction factor.
Chapter 17 Solutions
Principles of Foundation Engineering
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