Determine the service level moment capacity. The allowable stress for concrete is 0.45f, and the allowable stress for steel is 30000 psi. The cross section is reinforced with four No. 11 (in-lb) bars. The concrete tensile strength can be estimated by 7.5√f. The concrete modulus of Elasticity can be estimated by 57000√ √f. Use the transformed section. Given Properties E. = 29000000-psi f, := 60000-psi f=4000-psi f, :=60000-psi b:= 36 in h:=24 in 2-½ typ f=4000-psi b= 36 in E. = 29000000-psi E=57000-√√f-psi = 3604997 psi 24° in be Jse Tips: Service level moment implies that none of the compressive or tensile zone is failed even though the cross section can have cracks. That is the reason why the allowable stress has been used, not the ultimate/yield stress. The RC section will be cracked, but the maximum compressive stress in concrete will be smaller than the allowable stress, and the maximum tensile stress in steel will also be smaller than the respective allowable stress.
Determine the service level moment capacity. The allowable stress for concrete is 0.45f, and the allowable stress for steel is 30000 psi. The cross section is reinforced with four No. 11 (in-lb) bars. The concrete tensile strength can be estimated by 7.5√f. The concrete modulus of Elasticity can be estimated by 57000√ √f. Use the transformed section. Given Properties E. = 29000000-psi f, := 60000-psi f=4000-psi f, :=60000-psi b:= 36 in h:=24 in 2-½ typ f=4000-psi b= 36 in E. = 29000000-psi E=57000-√√f-psi = 3604997 psi 24° in be Jse Tips: Service level moment implies that none of the compressive or tensile zone is failed even though the cross section can have cracks. That is the reason why the allowable stress has been used, not the ultimate/yield stress. The RC section will be cracked, but the maximum compressive stress in concrete will be smaller than the allowable stress, and the maximum tensile stress in steel will also be smaller than the respective allowable stress.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Determine the service level moment capacity. The allowable stress for concrete is , and the allowable stress for steel is 30000 psi.
Transcribed Image Text:Determine the service level moment capacity. The allowable stress for concrete is 0.45f, and
the allowable stress for steel is 30000 psi.
The cross section is reinforced with four No. 11 (in-lb) bars. The concrete tensile strength can be
estimated by 7.5√ √f. The concrete modulus of Elasticity can be estimated by 57000 √f. Use
the transformed section.
Given Properties
E = 29000000-psi
f₁ = 60000-psi
f = 4000-psi
f₁ := 60000-psi
b:= 36 in
h:= 24 in
2-½
typ
T
f = 4000-psi
b== 36 in
E = 29000000-psi
E = 57000-√√f-psi = 3604997 psi
24"
in be
Jse
Tips: Service level moment implies that none of the compressive or tensile zone is failed even
though the cross section can have cracks. That is the reason why the allowable stress has been
used, not the ultimate/yield stress.
The RC section will be cracked, but the maximum compressive stress in concrete will be smaller
than the allowable stress, and the maximum tensile stress in steel will also be smaller than the
respective allowable stress.
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