Situation
A concrete beam with cross section in Figure CO4-2B is simply supported over a span of 4 m. The cracking moment of the beam is 75 kN·m.
1. Find the maximum uniform load that the beam can carry without causing the concrete to crack, in kN/m.
A. 35.2 |
C. 33.3 |
B. 37.5 |
D. 41.8 |
2. Find the modulus of rapture of the concrete used in the beam.
A. 4.12 MPa |
C. 3.77 MPa |
B. 3.25 MPa |
D. 3.54 MPa |
3. If the hallow portion is replaced with a square section of side 300 mm, what is the cracking moment of the new section in kN·m?
A. 71.51 |
C. 78.69 |
B. 76.58 |
D. 81.11 |