EXAM

Question 1

The actual rupture strength of a plastic material is greater than the ultimate tensile strength if we consider the reduced area due to

Answer 1

Necking

Question 2

Values for the factor of safety in ASD are based oN

Answer 2

all of the above

Question 3

Strain hardening is the result of dislocation or __________ of the metal crystals.

Answer 3

Movement

Question 4

LRFD is limited to inelastic behavior (T/F)

Answer 4

True

Question 5

Strength Limit State is to collapse prevention as Serviceability Limit State is to

Answer 5

Function

Question 6

Which of the following statement represents failure

Answer 6

none of the above

Question 7

7. ASD differs primarily with LRFD by providing

Answer 7

Safety Factors

Question 8

8. ASD is all about allowable stresses(T/F)

Answer 8

True

Question 9

9. What is the factor of safety for Tension Members in LRFD considering the combination U=1.4D

Answer 9

1.56

Question 10

10. For high-strength steel, the plastic strain increases because of the increase in ultimate strength (T/F)

Answer 10

False

Question 11

11. The limit state is the dividing line between failure and

Answer 11

Survival

Question 12

12. LRFD is all about allowable loads

Answer 12

False

Question 13

13. The reliability index is the number of times the measure of the variance is to the mean from the origin (t/f)

Answer 13

False

Question 14

14. By how many percent is LRFD cheaper for a Tension Member Design compared to ASD if L/D=1

Answer 14

6

Question 15

15. In ASD, the values of the coefficient on the Load Combinations are not based on probabilities. (T/F)

Answer 15

T

Question 16

1. Flexural Torsional Buckling is more commonly known as __________ in beams.

Answer 16

• lateral torsional buckling, lateral-torsional buckling

Question 17

2. Cc is a dimensionless parameter for slenderness in ASD (T/F)

Answer 17

• T

Question 18

3. Flexural buckling limit states include elastic, inelastic, and __________.

Answer 18

• Yielding

Question 19

4. When the actual width to thickness ratio is less than the limiting value set forth in the code, then the column will not experience ______________________.

Answer 19

• Local buckling

Question 20

5. Given: Fy=100ksi Determine the slenderness ratio kL/r when Fcr=(2/3)Fy at the end of the pure elastic stage.

Answer 20

• 65.5

Question 21

6. How many stiffened sections does an HSS rectangular section have?

Answer 21

• 4

Question 22

7. The slender limits for stiffened element local buckling are always greater than the slenderness limits for unstiffened local buckling. (T/F)

Answer 22

• T

Question 23

8. Which of the shapes is more vulnerable to lateral-torsional buckling?

Answer 23

• unequal angle

Question 24

9. The slenderness ratio is measured by dividing __________ over the radius of gyration.

Answer 24

• effective length

Question 25

10. Shanley’s concept introduces the critical load at which buckling begins, and this is less than the critical load of Engesser. (T/F)

Answer 25

• F

Question 26

11. The reason for a transition curve between the elastic and plastic stages for column behavior is mainly attributed to __________.

Answer 26

• Residual Stress

Question 27

12. Residual stresses are compressive where the rate of cooling is fast. (T/F)

Answer 27

• T

Question 28

13. Given: See Figure Question 11. Fy=100ksi Determine the slenderness ratio kL/r when all the fibers become plastic.

Answer 28

• 18.9

Question 29

14. The limiting width to thickness ratio \u03BBr of a plate element subject to compression force is called __________.

Answer 29

• non-compact limit

Question 30

15. How many unstiffened elements does a wide flange section have?

Answer 30

• 4

Question 31

16. Flame cutting of steel plates introduces compressive stresses at the points of cutting. (T/F)

Answer 31

• F

Question 32

17. Given: See Figure Question 11. Fy=100ksi What is the value of the tangent modulus at the transition stage?

Answer 32

• (1/8)E

Question 33

18. Shape factors Q for slender elements are less than 1, while shape factors Q for non-slender elements are __________.

Answer 33

• equal to 1

Question 34

19. Weak axis buckling is critical for columns under __________.

Answer 34

• axial compressive load only

Question 35

20. Given: See Figure Question 11. Fy=100ksi Determine the slenderness ratio kl/r if there were no residual stress

Answer 35

53.5

Question 36

21. How many number of supports does an unstiffened element have which makes it less stable than a stiffened element?

Answer 36

1

Question 37

22. Built up shapes are more stable than rolled shapes in terms of local buckling.(t/f)

Answer 37

False

Question 38

23. For local buckling failure on columns, the element subject to local loads must experience

Answer 38

uniform compression

Question 39

24. The local shape factor Qs is based on average stress developed in the plate element while the local shape factor Qa is based on ________________.

Answer 39

effective length

Question 40

25. βc is a dimensionless parameter representing the LRFD parameter

Answer 40

slenderness

Question 41

26. Given: See Figure Question 11. Fy=100ksi Determine the slenderness ratio kl/r when Fcr=(2/3)Fy at the elastoplastic stage.

Answer 41

23.2

Question 42

27. Residual stresses are tensile at the joints but not at the free end. (T/F)

Answer 42

T

Question 43

28. The point of load application at which no torsional behavior is induced in the member is called

Answer 43

none of the above

Question 44

29. Inelastic column buckling is common for long, slender columns. (T/F)

Answer 44

F

Question 45

30. Which of the shapes is more vulnerable to pure torsion?

Answer 45

Cruciform