4.10. Determine the nominal moment capacity of the section in Fig. 4.1b using the reinforcement areas from Problem 4.2. f, = 60,000 psi.
4.10. Determine the nominal moment capacity of the section in Fig. 4.1b using the reinforcement areas from Problem 4.2. f, = 60,000 psi.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Can you help me with question 4.10?
Transcribed Image Text:4.1.
Compare the cracking moment based on the gross section properties and the
transformed section properties with four No. 11 (No. 36) bars in Figure P4.1a
based on a concrete tensile capacity of 7.5 Vf.
Compare the cracking moment based on the gross section properties and the
transformed section properties with two No. 10 (No. 32) bars in Figure P4.1b
based on a concrete tensile capacity of 7.5 Vf.
Compare the cracking moment based on the gross section properties and the
transformed section properties with four No. 9 (No. 29) bars in Figure P4.1c
based on a concrete tensile capacity of 7.5 Vf.
Compare the cracking moment based on the gross section properties and the
transformed section properties with two No. 11 (No. 36) bars in Figure P4.1d
based on a concrete tensile capacity of 7.5 Vf.
4.5.
4.2.
4.3.
4.4.
Determine the cracking moment based on the gross section properties in
Figure P4.1d if the section is prestressed such that there is a 300 psi compression
stress in the extreme tension zone and the concrete tensile capacity is 7.5 Vf..
4.6. Determine the service level moment capacity of the section in Figure P4.1a if
the allowable stress for concrete is 0.45 f and the allowable stress for the rein-
forcement is 30,000 psi. Use the areas of reinforcement from Problem 4.1.
-28"
36"
-12"-|
36"
2-½"
24"
typ
36"
36"
2-2"
typ
8"
(a) f = 4000 psi
(b)
= 5000 psi
(c) = 6000 psi
(d)
= 3000 psi
FIGURE P4.1
FLEXURAL ANALYSIS AND DESIGN OF BEAMS
127
Determine the service level moment capacity of the section in Figure P4.1b
if the allowable stress for concrete is 0.45 f' and the allowable stress for the
reinforcement is 30,000 psi. Use the areas of reinforcement from Problem 4.2.
4.7.
4.8.
Determine the service level moment capacity of the section in Figure P4.1c
if the allowable stress for concrete is 0.45 f, and the allowable stress for the
reinforcement is 30,000 psi. Use the areas of reinforcement from Problem 4.3.
Determine the nominal moment capacity of the section in Fig. 4.1a using the
reinforcement areas from Problem 4.1. f,
4.9.
= 60,000 psi.
4.10. Determine the nominal moment capacity of the section in Fig. 4.1b using the
reinforcement areas from Problem 4.2. f, = 60,000 psi.
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