y the method of sections to the analysis of the K-truss depicted in the figure below. stions: Establish whether the truss is statically determinate. Justify your answer mathematically. Determine the reactions at the supports A and K. Apply cuts 1 and 2 to determine the forces in members DE, QE, and OP and state whether these bers are in compression or tension. 1800 lb B A C 1000 lb D I E R O F N 1200 lb Six panels @ 4 ft G S M 2000 lb H T L K 3 ft 1+ O 3 ft oblem 2 ntenna on a testing range, together with its supporting structure, weighs 300lb with a mass center

The two vertical steel [E = 200 GPa] rods that support rigid bar ABCD are initially free of stress. Rod (1) has an area of A₁ = 350 mm² and a length of L₁ = 2.1 m. Rod (2) has an area of A₂ = 375 mm² and a length of L₂ = 1.5 m. Assume dimensions of a = 3.2 m, b = 1.1 m, and c = 1.4 m. After a load of P = 130 kN is applied to the rigid bar at D, determine: (a) the normal stresses in rods (1) and (2) (b) the magnitude of the downward deflection of the rigid bar at D. y,v (2) a L2 Rigid bar L₁ Answer: (a) σ₁ = i 02= i (b) VD= i (1) B MPa MPa mm -X,U b C ↓ С D P

Calculate the forces in members AC, AD, and DE for the loaded truss. Restraining link BC is horizontal. Forces are positive if in tension, negative if in compression. B Answer: AC = 3' AD = i i DE = i C 3' 600 lb D 3' E lb lb lb

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