Determine the wall loading that can be car- ried by a long footing 1 m wide and located 1.5 m below the ground surface. Strength tests indicate, that the soil has a cohesion of 58 kN/m? and an angle of internal friction of 20°. The total soil unit weight is 18 kN/m The soil above the footing is well compacted, and the depth factors will apply. The soil rigidity index is greater than the critical in- dex. The water table is expected to rise to the ground surface. Use a factor of safety equal to 3 with the extended general bearing ca- pacity equation. (eq. 13-6 in pdf note) attached in image
Determine the wall loading that can be car- ried by a long footing 1 m wide and located 1.5 m below the ground surface. Strength tests indicate, that the soil has a cohesion of 58 kN/m? and an angle of internal friction of 20°. The total soil unit weight is 18 kN/m The soil above the footing is well compacted, and the depth factors will apply. The soil rigidity index is greater than the critical in- dex. The water table is expected to rise to the ground surface. Use a factor of safety equal to 3 with the extended general bearing ca- pacity equation. (eq. 13-6 in pdf note) attached in image
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Determine the wall loading that can be car-
ried by a long footing 1 m wide and located
1.5 m below the ground surface. Strength
tests indicate, that the soil has a cohesion of
58 kN/m? and an angle of internal friction of
20°. The total soil unit weight is 18 kN/m
The soil above the footing is well compacted,
and the depth factors will apply. The soil
rigidity index is greater than the critical in-
dex. The water table is expected to rise to the
ground surface. Use a factor of safety equal
to 3 with the extended general bearing ca-
pacity equation. (eq. 13-6 in pdf note) attached in image
![9:05 4
File Details
2222-CE-4321-101-FOUNDATION...
Chapter 13: Foundations
tional practice to apply a factor of safety of 2.5 or 3 to the value of qnet (Equation 13-4) to
obtain qdesign:
Inet
Inet
Adesign
or
2.5
(13-5)
Application for Design-The Extended Bearing Capacity
Equation
Equations 13-la, 13-1b, and 13-4 apply for the condition of an infinitely long strip foun-
dation with the base horizontal, with a vertical load centrically applied, where the ground
surface surrounding the foundation is horizontal; also recall that the shearing strength of the
soil above the plane level with the foundation base was neglected. In practice, these condi-
tions are not always present: Foundations have finite dimensions (the commonly used
shapes include square, rectangular, and circular as well as the long strip); the soil above the
level of the footing may have significant shear ştrength; the loading on a horizontal foun-
dation may be inclined or eccentrically positioned; the foundation base may be inclined; or
the soil surface may be sloped.
The general bearing capacity equation developed for the infinite strip can be ex-
tended to consider variations from the basic assumptions by applying modification fac-
tors that account for the effect of each variation. The extended bearing capacity equation
[119] is written
Inet = cN_(rsdjb.) + B Y;N,(r,s,diÞ)
+ YD;(Nq - 1)(r,s,d¿P)
(13-6)
where r, ry, rq = reduction factors to compensate for a possible punching-local shear
condition
Se, Sy, Sq = shape factors for square, rectangular, and circular foundations
de, dy, de = depth factors
i, iy, ig
be, by, bą, = base tilt factors
%3D
load inclination factors
%3D
Suitable modification factors to use with Equation 13-6 are presented in the following sec-
tions. Where a modification factor does not apply for the foundation condition under study,
its value for Equation 13-6 is considered to be unity (that is, neglected; factors that do not
apply simply are disregarded in the equation).
In summary, Equation 13-6 should be utilized for all practical applications when
calculating the value of quet that is substituted into Equation 13-5 to obtain qderign.
The illustrations that follow demonstrate application of the theory that has been de-
veloped to this point for long strip footings supporting vertical load. Procedures to modify
the extended bearing capacity eauation. for use with other shaDes of footings and load con-
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Transcribed Image Text:9:05 4
File Details
2222-CE-4321-101-FOUNDATION...
Chapter 13: Foundations
tional practice to apply a factor of safety of 2.5 or 3 to the value of qnet (Equation 13-4) to
obtain qdesign:
Inet
Inet
Adesign
or
2.5
(13-5)
Application for Design-The Extended Bearing Capacity
Equation
Equations 13-la, 13-1b, and 13-4 apply for the condition of an infinitely long strip foun-
dation with the base horizontal, with a vertical load centrically applied, where the ground
surface surrounding the foundation is horizontal; also recall that the shearing strength of the
soil above the plane level with the foundation base was neglected. In practice, these condi-
tions are not always present: Foundations have finite dimensions (the commonly used
shapes include square, rectangular, and circular as well as the long strip); the soil above the
level of the footing may have significant shear ştrength; the loading on a horizontal foun-
dation may be inclined or eccentrically positioned; the foundation base may be inclined; or
the soil surface may be sloped.
The general bearing capacity equation developed for the infinite strip can be ex-
tended to consider variations from the basic assumptions by applying modification fac-
tors that account for the effect of each variation. The extended bearing capacity equation
[119] is written
Inet = cN_(rsdjb.) + B Y;N,(r,s,diÞ)
+ YD;(Nq - 1)(r,s,d¿P)
(13-6)
where r, ry, rq = reduction factors to compensate for a possible punching-local shear
condition
Se, Sy, Sq = shape factors for square, rectangular, and circular foundations
de, dy, de = depth factors
i, iy, ig
be, by, bą, = base tilt factors
%3D
load inclination factors
%3D
Suitable modification factors to use with Equation 13-6 are presented in the following sec-
tions. Where a modification factor does not apply for the foundation condition under study,
its value for Equation 13-6 is considered to be unity (that is, neglected; factors that do not
apply simply are disregarded in the equation).
In summary, Equation 13-6 should be utilized for all practical applications when
calculating the value of quet that is substituted into Equation 13-5 to obtain qderign.
The illustrations that follow demonstrate application of the theory that has been de-
veloped to this point for long strip footings supporting vertical load. Procedures to modify
the extended bearing capacity eauation. for use with other shaDes of footings and load con-
( Previous
Next
Dashboard
Calendar
To Do
Notifications
Inbox
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