STEEL - Materials for Civil and Construction Engineers - page 136

3.29 A Charpy V Notch test was conducted for an ASTM A572 Grade 50
bridge steel. The average values of the test results at four different
test temperatures were found to be
10 ft.lb at
15 ft.lb at 0

- 50°F

F
40 ft.lb at 40

°

F
60 ft.lb at 100

°

° F

The bridge will be located in a region where specifications require a
minimum of 25 ft.lb fracture toughness at 30 F for welded fracture-

critical members. If the bridge contains a welded flange in a
fracture-critical member, does the steel have adequate Charpy V
notch fracture toughness? Show your supporting calculations.
3.30 How can the flaws in steel and welds be detected? Discuss the con-
cept of a nondestructive test used for this purpose.
3.31 Determine the welding zone classification of A36 and A922 steel.
3.32 Briefly define steel corrosion. What are the four elements necessary
for corrosion to occur?
3.33 Discuss the main methods used to protect steel from corrosion.

°

3.11

References
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