Design a rectangular section for the beam, loads, and ρ values shown in the following figures. Assume concrete weighs 150lb/ft3 , fy = 60,000 psi, and f’c = 4000 psi. You will need to estimate and include self-weight in your calculation of Mu. a) Satisfy φMn≥Mu. i. You MUST show moment diagrams for all load combinations, regardless of whether or not they control. ii. You MUST satisfy this equation. There are many answers. Select bar sizes that are reasonable. (Hint: Your beam will have more than one piece of rebar.) b) Show sketches of the cross sections, including bar sizes, arrangement, and spacing.
Design a rectangular section for the beam, loads, and ρ values shown in the following figures. Assume concrete weighs 150lb/ft3 , fy = 60,000 psi, and f’c = 4000 psi. You will need to estimate and include self-weight in your calculation of Mu. a) Satisfy φMn≥Mu. i. You MUST show moment diagrams for all load combinations, regardless of whether or not they control. ii. You MUST satisfy this equation. There are many answers. Select bar sizes that are reasonable. (Hint: Your beam will have more than one piece of rebar.) b) Show sketches of the cross sections, including bar sizes, arrangement, and spacing.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Design a rectangular section for the beam, loads, and ρ values shown in the
following figures. Assume concrete weighs 150lb/ft3
, fy = 60,000 psi, and f’c = 4000 psi. You will
need to estimate and include self-weight in your calculation of Mu.
a) Satisfy φMn≥Mu.
i. You MUST show moment diagrams for all load combinations, regardless of
whether or not they control.
ii. You MUST satisfy this equation. There are many answers. Select bar sizes that
are reasonable. (Hint: Your beam will have more than one piece of rebar.)
b) Show sketches of the cross sections, including bar sizes, arrangement, and spacing.
Transcribed Image Text:10ft
11 ft
PL=30k
PLL =24k
12 ft
*
(1)
(2)
WDL =3K/ft, WLL =1K/ft
W₁ =1.5k/ft and wp=1.5k/ft
10ft
11ft
PLL =24k
★
WDL=2k/ft
Use p =
Use p = ½ Pb
Pb = steel in balanced section
10ft
0.18fic
fy
Use p
=
0.18fic
fy
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