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For the 2D truss with the applied loads shown below, the strain energy in the member XY is _______ kN-m. For member XY, assume AE=30kN, where A is cross section area and E is the modulus of elasticity.
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- 5
- 33
- 23
- 234
Correct Option: A
RA × 3 + 10 × 9 = 0
⇒ RA = –30 kN
RB = 35 kN
Taking joint A
Taking joint B
Taking joint x
Fx = 10 kN
| U = | 2AE |
| = | = 5 kNm | 2 × 3 |
