Engineering Mechanics - Structural Analysis

Exercise :: Structural Analysis - General Questions

  • Structural Analysis - General Questions
6. 

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: Option D

Explanation:

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7. 

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: Option D

Explanation:

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8. 

The Warren truss is used to support a staircase. Determine the force in members CE, ED, and DF, and state whether the members are in tension or compression. Assume all joints are pinned.

A. ED = 3.60 kN T, DF = 1.70 kN C, CE = 6.22 kN C
B. ED = 2.00 kN C, DF = 2.26 kN C, CE = 2.26 kN T
C. ED = 0.800 kN C, DF = 1.131 kN T, CE = 2.83 kN C
D. ED = 0.400 kN C, DF = 2.26 kN T, CE = 4.53 kN C

Answer: Option D

Explanation:

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9. 

Determine the horizontal and vertical components of force at pins A and C of the two-member frame.

A. Ax = -212 N, Ay = 388 N, Cx = 212 N, Cy = 212 N
B. Ax = -300 N, Ay = 300 N, Cx = 300 N, Cy = 300 N
C. Ax = -849 N, Ay = 149 N, Cx = 849 N, Cy = 849 N
D. Ax = -1200 N, Ay = 1200 N, Cx = 1200 N, Cy = -600 N

Answer: Option B

Explanation:

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10. 

A tower used in an electrical substation supports a power line which exerts a horizontal tension of T = 500 lb on each side truss of the tower as shown. Determine the force in members BC, CM, and LM of a side truss and indicate whether the members are in tension or compression.

A. CM = 833 lb T, CB = 3330 lb C, LM = 2670 lb T
B. CM = 581 lb T, CB = 2050 lb C, LM = 2000 lb T
C. CM = 325 lb T, CB = 3040 lb C, LM = 2670 lb T
D. CM = 58 lb T, CB = 1646 lb C, LM = 1600 lb T

Answer: Option A

Explanation:

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