For the beams shown in the following table, calculate bending moment capacity, Mu, using both analytical and approximate equations and determine the percentage of error because of using the approximate equation. a) Analytical equation: Mu Dimension and = b) Approximate equation: Mu = As-fy Ø.As. fy.d (1-0.59 455) fc.b.d 4Açd where = 0.9 limitations for this approximation: 1. cross-section: rectangular 2. steel yield: fy = 60ksi 3. units: As & d: inches, Mu: k-ft Flexural strength, Mu
For the beams shown in the following table, calculate bending moment capacity, Mu, using both analytical and approximate equations and determine the percentage of error because of using the approximate equation. a) Analytical equation: Mu Dimension and = b) Approximate equation: Mu = As-fy Ø.As. fy.d (1-0.59 455) fc.b.d 4Açd where = 0.9 limitations for this approximation: 1. cross-section: rectangular 2. steel yield: fy = 60ksi 3. units: As & d: inches, Mu: k-ft Flexural strength, Mu
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:3.1 For the beams shown in the following table, calculate bending moment capacity, Mu, using both analytical and
approximate equations and determine the percentage of error because of using the approximate equation.
a) Analytical equation: Mu
b) Approximate equation: Mu
Dimension and
material properties
b= 12"
d= 18"
As= 2.37 in²
f'c = 5 ksi
|fy=
= 60 ksi
b= 18"
d= 18"
A,= 3.16 in²
f'c = 4 ksi
|fy =
= 60 ksi
b= 24"
d=33"
As= 7.8 in²
f'c = 6 ksi
fy = 60 ksi
b= 22"
d=43"
As= 12.48 in²
f'c = 5 ksi
|fy = 60 ksi
b= 16"
d=24"
A,= 3.16 in²
f'c = 4 ksi
fy = 40 ksi
=
Ø.As. fy. d (1-0.59 455) where = 0.9
As.fy
fc.b.d
4A d
limitations for this approximation:
1. cross-section: rectangular
2. steel yield: fy = 60ksi
3. units: As & d: inches, Mu: k-ft
Flexural strength, Mu
Analytical Approximate
equation
equation
Percent
error
Shear
reinforcement
stirrups
Tension
reinforcement
As
Beam Section
a
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