A 50-kip vertical downward column load acts at the centroid of a 4-ft-square (4 ft by 4 ft) normal-weightconcrete footing. The footing concrete has a unit weight of 150 pcf. The bottom of this footing is 3 ftbelow the level ground surface and the top of the footing is flush with the ground surface. Thegroundwater table is at a depth of 15 ft below the ground surface. Compute the bearing pressure atthe base of the footing.Answer:Opsf OksfA vertical force of 57.2 kips acts on a 4.0 ft x 4.0 ft area. Compute the induced vertical stress, Aoz, ata point 4.0 ft (zf = 4 ft) below the center (xf = 0 ft) of this square area using the following Boussinesqchart.Width = BSquare Loaded Area1.0050.51.0 A vertical force of 57.2 kips acts on a 4.0 ft × 4.0 ft area. Compute the induced vertical stress, Aoz, ata point 4.0 ft (zZf = 4 ft) below the center (xf = 0 ft) of this square area using the following Boussinesqchart.Width = BSquare Loaded Area1.00.50.51.0H x/B0.90.80.70.50.60.50.41.00.30.21.52.0T'0="I

The given data is: Vertical load=50 kip Area=4*4=16 m2 Unit weight of concrete=150 pcf

A 50-kip vertical downward column load acts at the centroid of a 4-ft-square (4 ft by 4 ft) normal-weigh concrete footing. The footing concrete has a unit weight of 150 pcf. The bottom of this footing is 3 ft below the level ground surface and the top of the footing is flush with the ground surface. The groundwater table is at a depth of 15 ft below the ground surface. Compute the bearing pressure at the base of the footing.

A 50-kip vertical downward column load acts at the centroid of a 4-ft-square (4 ft by 4 ft) normal-weigh concrete footing. The footing concrete has a unit weight of 150 pcf. The bottom of this footing is 3 ft below the level ground surface and the top of the footing is flush with the ground surface. The groundwater table is at a depth of 15 ft below the ground surface. Compute the bearing pressure at the base of the footing.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.

Question

A 50-kip vertical downward column load acts at the centroid of a 4-ft-square (4 ft by 4 ft) normal-weight
concrete footing. The footing concrete has a unit weight of 150 pcf. The bottom of this footing is 3 ft
below the level ground surface and the top of the footing is flush with the ground surface. The
groundwater table is at a depth of 15 ft below the ground surface. Compute the bearing pressure at
the base of the footing.
Answer:
Opsf Oksf
A vertical force of 57.2 kips acts on a 4.0 ft x 4.0 ft area. Compute the induced vertical stress, Aoz, at
a point 4.0 ft (zf = 4 ft) below the center (xf = 0 ft) of this square area using the following Boussinesq
chart.
Width = B
Square Loaded Area
1.0
05
0.5
1.0

A vertical force of 57.2 kips acts on a 4.0 ft × 4.0 ft area. Compute the induced vertical stress, Aoz, at
a point 4.0 ft (zZf = 4 ft) below the center (xf = 0 ft) of this square area using the following Boussinesq
chart.
Width = B
Square Loaded Area
1.0
0.5
0.5
1.0
H x/B
0.9
0.8
0.7
0.5
0.6
0.5
0.4
1.0
0.3
0.2
1.5
2.0
T'0="I

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