Structural Design Specifications MCQs

Show Answers

Correct options are highlighted when revealed.

2.Which of the following statements about web stiffeners is accurate?

d represents the spacing between flange angles or the clear gap between the flanges.Vertical stiffeners should be installed at intervals no more than 1.5 times d and no less than 0.33 times d.For horizontal stiffeners, d denotes the clear distance between the horizontal stiffener and the tension flange.All of the above statements are correct.

3.Which of the following statements is accurate regarding rivet spacing and pitch?

The smallest allowable pitch for rivets must be at least 2.5 times the diameter of the rivet hole.The spacing between centers of two adjacent rivets aligned with the stress direction should not be less than a certain limit.In compression members, the distance between centers of two rivets along the stress direction must not be greater than 12 times the thickness (t) or 203 mm, whichever is smaller.All of the above statements are correct.None of the above.

4.Which of the following statements about rivet dimensions is correct?

The nominal diameter of a rivet is measured before it is driven.The rivet hole diameter corresponds to the rivet's gross cross-sectional area.For rivets with nominal diameters under 25 mm, the hole diameter equals the rivet diameter plus 1.5 mm.All of the above statements are accurate.

5.What is the anchorage length of a standard U-shaped hook for a tensioned reinforcing bar with diameter d?

6.Which of the following statements is accurate regarding the mechanical properties of different types of steel?

Steel castings have a minimum tensile strength of 41 kg/mm² and a minimum yield strength of 20.5 kg/mm².High tensile steel possesses a minimum tensile strength of 58 kg/mm².Mild steel exhibits a minimum tensile strength of 44 kg/mm² along with a minimum elongation of 23% measured over a gauge length of 5.65√A.All of the above statements are correct.None of the above.

7.What is the maximum allowable bending stress (Pbet) for steel slab bases?

1500 kg/cm²1650 kg/cm²1800 kg/cm²1890 kg/cm²

8.What substances must be completely removed from reinforcement before use?

Coatings of paintUnattached rustDetached mill scaleAll of the above

9.When evaluating the spans of filler joists that support a slab, the spans can be treated as roughly equal provided the longest span is no more than what percentage greater than the shortest span?

5%10%15%25%

10.Under which conditions is the removal of props permitted?

For slabs with spans up to 4.5 meters, after 14 daysFor beams with spans up to 6 meters, after 14 daysFor slabs with spans up to 4.5 meters, after 7 daysAll of the above