A four-span continuous beam of constant rectangular cross section is supported at A, B, C, D, and E. The factored moments resulting from analysis are as shown. Use Mb to determine the required concrete dimensions for this beam, assuming d = 1.75b, and determine the reinforcement requirement at support b. Use reinforcement ratio of 0.6pmax in your calculation and use fy = 60,000 psi and fr' = 6000 psi. At Supports, ft-kips M = 138 Mb = 220 M = 200 Md=220 M₂ = 138 At Midspan, ft-kips Mab = 158 Mbc = 138 Mcd=138 Mde = 158

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Chapter9: Composite Construction
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Problem 9.1.3P
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A four-span continuous beam of constant rectangular cross section is supported at A, B, C,
D, and E. The factored moments resulting from analysis are as shown. Use Mb to
determine the required concrete dimensions for this beam, assuming d = 1.75b, and
determine the reinforcement requirement at support b. Use reinforcement ratio of 0.6pmax
in your calculation and use fy = 60,000 psi and fr' = 6000 psi.
At Supports, ft-kips
M = 138
Mb = 220
M = 200
Md=220
M₂
= 138
At Midspan, ft-kips
Mab = 158
Mbc = 138
Mcd=138
Mde =
158
Transcribed Image Text:A four-span continuous beam of constant rectangular cross section is supported at A, B, C, D, and E. The factored moments resulting from analysis are as shown. Use Mb to determine the required concrete dimensions for this beam, assuming d = 1.75b, and determine the reinforcement requirement at support b. Use reinforcement ratio of 0.6pmax in your calculation and use fy = 60,000 psi and fr' = 6000 psi. At Supports, ft-kips M = 138 Mb = 220 M = 200 Md=220 M₂ = 138 At Midspan, ft-kips Mab = 158 Mbc = 138 Mcd=138 Mde = 158
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