Structural Analysis

Determine the force in members GF, CF, CD of the symmetric roof truss and indicate whether the members are in tension or compression.

A:

CD = 1.783 kN C, CF = 0, GF = 1.427 kN T

B:

CD = 3.48 kN C, CF = 00904 kN T, GF = 1.783 kN T

C:

CD = 2.79 kN C, CF = 0.723 kN T, GF = 1.427 kN T

D:

CD = 2.23 kN C, CF = 0, GF = 1.783 kN T

Answer: D

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A crane is constructed from two side trusses. If a load of 4 kN is suspended from one of these trusses as shown, determine the force in members FG, GK, and <KJ. State whether the members are in tension or compression. Assume the joints are pin-connected.

A:

KG = 2.66 kN C, KJ = 4.00 kN C, FG = 5.96 kN T

B:

KG = 5.66 kN T, KJ = 4.00 kN C, FG = 17.89 kN T

C:

KG = 0, KJ = 4.00 kN C, FG = 8.94 kN T

D:

KG = 1.886 kN C, KJ = 4.00 kN C, FG = 5.96 kN T

Answer: D

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The floor beams AB and BC are stiffened using the two tie rods CD and AD. Determine the force along each rod. Assume the three contacting members at B are smooth and the joints at A, C, and D are pins.

A:

T = 480 lb

B:

T = 520 lb

C:

T = 1248 lb

D:

T = 1152 lb

Answer: C

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Determine the force in members FF, FB, and BC of the Fink truss and indicate whether the members are in tension or compression.

A:

BF = 693 lb T, FG = 1800 lb C, BC = 1212 lb T

B:

BF = 8660 lb C, FG = 3600 lb C, BC = 1212 lb T

C:

BF = 3810 lb T, FG = 3600 lb C, BC = 1212 lb T

D:

BF = 1732 lb T, FG = 2400 lb C, BC = 1212 lb T

Answer: A

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Determine the magnitude of the forces in pins B and D of the four-member frame.

A:

B = 503 lb, D = 225 lb

B:

B = 225 lb, D = 503 lb

C:

B = 56.3 lb, D = 125.8 lb

D:

B = 125.8 lb, D = 112.5 lb

Answer: C

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Questions for: Structural Analysis