A reinforced concrete beam section is "b" wide and "h" deep. It is to be reinforced with 10 mmø stirrups with clear concrete covering of 40 mm. Consider f'c = 28 MPa and fy = 415 MPa. Value of B1 shall be 0.85 for f'c between 17 and 28 MPa. For fc > 28 MPa,B1 shall be reduced linearly at a rate of 0.05 for each 7 MPa in excess of 28 MPa. 1. f the beam is reinfarced with 4 - 25mmø tension steel only, calculate the tension steel strain et. 2.)f the beam is reinforced with 6- 28mmø tension steel (in two layers of 3 bars each with 25 mm clear distance between layers), calculate the tension steel strain et.
A reinforced concrete beam section is "b" wide and "h" deep. It is to be reinforced with 10 mmø stirrups with clear concrete covering of 40 mm. Consider f'c = 28 MPa and fy = 415 MPa. Value of B1 shall be 0.85 for f'c between 17 and 28 MPa. For fc > 28 MPa,B1 shall be reduced linearly at a rate of 0.05 for each 7 MPa in excess of 28 MPa. 1. f the beam is reinfarced with 4 - 25mmø tension steel only, calculate the tension steel strain et. 2.)f the beam is reinforced with 6- 28mmø tension steel (in two layers of 3 bars each with 25 mm clear distance between layers), calculate the tension steel strain et.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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b = 370 mm
h = 530 mm
Answer the first 3 items only.
Transcribed Image Text:Problem set 2
A reinforced concrete beam section is "b" wide and "h" deep. It is to be reinforced with 10 mmø stirrups with clear
cancrete covering of 40 mm. Consider f'c = 28 MPa and fy = 415 MPa. Value of ß1 shall be 0.85 for f'c between 17 and 28 MPa.
For f'c > 28 MPa,B1 shall be reduced linearly at a rate of 0.05 for each 7 MPa in excess of 28 MPa.
1.)if the beam is reinforced with 4 - 25mmø tension steel only, calculate the tension steel strain et.
2.)If the beam is reinforced with 6 - 28mmø tension stee (in two layers of 3 bars each with 25 mm clear distance between layers),
calculate the tension steel strain et.
3.). Calculate the flexural strength of the beam in question 2.
4.). Determine the total unfactored dead load and live load using the result in problem 3 that the beam can carry if dead load is
30% of the total live load. Use "L" as total beam length. Assumed that the beam is simply supported.
5). Determine the superimpose dead load that the beam can carry from the resut in problem 4 if concrete weighs 23.6kN/m3.
b
k....
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