Direction: A two span continuous beam having equal spans each of length L is subjected to a uniformly distributed load w per unit length. The beam has constant flexural rigidity.
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The bending moment at the middle support is
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- 4wL2
- 8wL2
- 12wL2
- 16wL2
Correct Option: B
RA + RB + RC = 2wL
Let RA = RB = R
2R = 2wL - RC
| = 2wL - | 4 |
| = | 4 |
| ∴ R = | 8 |
| BM at C = | × L - | |||
| 8 | 2 |
| = - | 2 |
