Design of Steel Structures

291. The web crippling due to excessive bearing stress can be avoided by

  1. Increasing the web thickness
  2. Providing suitable stiffeners
  3. Increasing the length of the bearing plates
  4. None of the above

Correct answer: (C)
Increasing the length of the bearing plates

292. To keep the intensity of bearing pressure between the column base and concrete compressive and to vary from zero to 2P/BL, the ratio of the moment M to the axial load P should be

  1. L/2
  2. L/3
  3. L/4
  4. L/6

Correct answer: (D)
L/6

293. To keep the intensity of bearing pressure between the column base and concrete, compressive throughout the length of the column base, the ratio of the moment M to axial load P should be

  1. < L/3
  2. < L/6
  3. > L/3
  4. > L/6

Correct answer: (B)
< L/6

294. To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be

  1. 1
  2. 2
  3. 3
  4. 4

Correct answer: (B)
2

295. To the calculated area of cover plates of a built-up beam, an allowance for rivet holes to be added, is

  1. 10 %
  2. 13 %
  3. 15 %
  4. 18 %

Correct answer: (B)
13 %

296. Tongue plates are provided in a steel girder at

  1. The upper flange
  2. The lower flange
  3. The upper end of the web
  4. The upper and lower ends of the web

Correct answer: (D)
The upper and lower ends of the web

297. Under a concentrated load, bearing stress fb in a beam is given by (where b is the length of the bearing plate and h is the depth of the root of the fillet).

  1. fb = W/(b + h√tw
  2. fb = W/(b + 2h√tw
  3. fb = W/(b + 2h√tw
  4. fb = W/(b + h√tw

Correct answer: (B)
fb = W/(b + 2h√tw

298. Water pressure in a 80 cm water main is 10 kg/cm2. The minimum thickness of the metal required for the water main, not to be stressed more than 200 kg/cm2, is

  1. 1 cm
  2. 1.5 cm
  3. 2 cm
  4. 2.5 cm

Correct answer: (C)
2 cm

299. Web crippling generally occurs at the point where

  1. Bending moment is maximum
  2. Shearing force is minimum
  3. Concentrated loads act
  4. Deflection is maximum

Correct answer: (C)
Concentrated loads act

300. When a large value of radius of gyration is not required

  1. Channels are placed back to back
  2. Channel flanges are kept inward
  3. Channel flanges are kept outward
  4. None of these

Correct answer: (B)
Channel flanges are kept inward

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