Design the beam shown below according to the ACI 318 requirements. The beam is to have a uniform rectangular cross section along the entire length. It has to carry a service live load of 1.8 kip/ft., which can be over the entire length of the beam or over only a portion of the beam. Consider also the self-weight of the beam. The height (h) to width (b) ratio of the beam section should be around 1.8. Use Grade 60 steel and normal-weight concrete with a specified concrete compressive strength f =4,000 psi. Determine the cross-sectional dimensions of the beam based on the most demanding loading condition; and the number, size, and locations of the reinforcing bars required for the segment of the beam between the two supports and for the overhang segment, respectively. For each segment, determine the amount of reinforcement required using the most critical load combination for the segment. Qualitatively sketch where the top or bottom reinforcement can be terminated along the beam. The beam has No. 3 stirrups (transverse reinforcement). The design should meet the bar spacing and concrete cover requirements of ACI 318, with the minimum concrete cover be 1-1/2 in. Assume the maximum aggregate size is 4 in. Sketch the cross section of the beam in each segment, showing the location of the reinforcing bars and their distance from the compression face. 24' 8'
Design the beam shown below according to the ACI 318 requirements. The beam is to have a uniform rectangular cross section along the entire length. It has to carry a service live load of 1.8 kip/ft., which can be over the entire length of the beam or over only a portion of the beam. Consider also the self-weight of the beam. The height (h) to width (b) ratio of the beam section should be around 1.8. Use Grade 60 steel and normal-weight concrete with a specified concrete compressive strength f =4,000 psi. Determine the cross-sectional dimensions of the beam based on the most demanding loading condition; and the number, size, and locations of the reinforcing bars required for the segment of the beam between the two supports and for the overhang segment, respectively. For each segment, determine the amount of reinforcement required using the most critical load combination for the segment. Qualitatively sketch where the top or bottom reinforcement can be terminated along the beam. The beam has No. 3 stirrups (transverse reinforcement). The design should meet the bar spacing and concrete cover requirements of ACI 318, with the minimum concrete cover be 1-1/2 in. Assume the maximum aggregate size is 4 in. Sketch the cross section of the beam in each segment, showing the location of the reinforcing bars and their distance from the compression face. 24' 8'
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Design the beam shown below according to the ACI 318 requirements. The beam is to have a
uniform rectangular cross section along the entire length. It has to carry a service live load of 1.8
kip/ft., which can be over the entire length of the beam or over only a portion of the beam. Consider
also the self-weight of the beam. The height (h) to width (b) ratio of the beam section should be
around 1.8. Use Grade 60 steel and normal-weight concrete with a specified concrete compressive
strength f = 4,000 psi. Determine the cross-sectional dimensions of the beam based on the most
demanding loading condition; and the number, size, and locations of the reinforcing bars required
for the segment of the beam between the two supports and for the overhang segment, respectively.
For each segment, determine the amount of reinforcement required using the most critical load
combination for the segment. Qualitatively sketch where the top or bottom reinforcement can be
terminated along the beam. The beam has No. 3 stirrups (transverse reinforcement). The design
should meet the bar spacing and concrete cover requirements of ACI 318, with the minimum
concrete cover be 1-1/2 in. Assume the maximum aggregate size is 4 in. Sketch the cross section
of the beam in each segment, showing the location of the reinforcing bars and their distance from
the compression face.
24'
8'
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