Chapter 3 Problem ANSWERS (second edition)

1.When was the first AISC Specification published and what was its purpose?Answer: see Section 3.2

3.Sketch and label a typical stress-strain curve for steel subjected to a simple uniaxial tension test.Answer: see Section 3.3

5.What happens to a steel element when it is loaded beyond the elastic limit and then unloaded?Answer: see Section 3.3

7.Sketch and label 10 different structural shape cross sections whose properties are given in the AISC Specification.Answer: see Section 3.4

9.What are the nominal and actual depths of a W14 × 730 wide-flange member? Compare these to the nominal and actual depths of a W14 × 145. (Hint: Use your AISC Manual.)

From Manual Table 1-1, the nominal depth of theW14 x 730 is 14 inches while the actual depth is 22.4 in. From Manual Table 1-1, the nominal depth of the W14 x 145 is14 inches while the actual depth is 14.8 in.

11.What are the actual depth and flange width of an HP12 × 84? What are the thicknesses of the web and flange? (Hint: Use your AISC Manual.)

From Manual Table 1-4 the actual depth of the member is 12.3 in. and the flange width is also 12.3 in. The web thickness is 0.685 in. and the flange thickness is 0.685 in.

13. What is the weight per linear foot of an L5 × 3 × ½ member? (Hint: Use your AISC Manual.)

From Manual Table 1-7, the weight of this angle is 12.8 lbs per foot.

15. What is the outside diameter of a round HSS6.000 × 0.500? What are the nominal and design wall thicknesses? (Hint: Use your AISC Manual.)

All dimensions of round HSS may be found in Manual Table 1-13. The nominal thickness is given in the shape name, 0.5 in., and the actual thickens is given in the table, 0.465 in.

17. What are the outside diameter and wall thickness of a Pipe 4 xx-Strong? (Hint: Use your AISC Manual.)

From Manual Table 1-14, this member has a outside diameter of 4.5 in., a nominal thickness of 0.674 in. and a design thickness of 0.628 in.

19.What are the three preferred types of steel for shapes in the construction industry? (See Section 3.5)

Carbon steel, high-strength low-alloy steel, corrosion resistant high-strength low-alloy steel

21.Name three elements that improve the corrosion resistance of steel. (See Section 3.5)

Copper, Phosphorous, Chromium

23.What grade of steel is most commonly used today in the production of round HSS? Rectangular HSS?

Round HSS – A500 Gr B with Fy =42 ksi (Pipe A53 Gr B with Fy = 35 ksi)

Rectangular HSS – A500 Gr B with Fy = 46 ksi

25.What grade of steel is typically used for high-strength bolts in construction? (See Section 3.6.3)

A325 or A490

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