A truss, as shown in the figure, is carrying 180 kN load

Home » Steel Structures » Steel structures miscellaneous » Question

A truss, as shown in the figure, is carrying 180 kN load at node L₂. The force in the diagonal member M₂U₄ will be

1. 100 kN tension
2. 100 kN compression
3. 80 kN tension
4. 80 kN compression

Correct Option: A

Taking moment about L
V_L6 × 24 = 180 × 2 × 4
∴ VL6 = 60 kN
V_L0 = 120 kN
Force in member M₂ L₄ is zero.
Take section along u₃ u₄ – L₃ L₄

Σ v = 0
F_U4M2 cos θ = 60

∴ F_U4M2 =	60
	cos θ

=	60 × 5	= 100 kN
	3

The force is tension (pulling)