EXAM Flashcards
(45 cards)
1
Q
The actual rupture strength of a plastic material is greater than the ultimate tensile strength if we consider the reduced area due to
A
Necking
2
Q
Values for the factor of safety in ASD are based oN
A
all of the above
3
Q
Strain hardening is the result of dislocation or __________ of the metal crystals.
A
Movement
4
Q
LRFD is limited to inelastic behavior (T/F)
A
True
5
Q
Strength Limit State is to collapse prevention as Serviceability Limit State is to
A
Function
6
Q
Which of the following statement represents failure
A
none of the above
7
Q
- ASD differs primarily with LRFD by providing
A
Safety Factors
8
Q
- ASD is all about allowable stresses(T/F)
A
True
9
Q
- What is the factor of safety for Tension Members in LRFD considering the combination U=1.4D
A
1.56
10
Q
- For high-strength steel, the plastic strain increases because of the increase in ultimate strength (T/F)
A
False
11
Q
- The limit state is the dividing line between failure and
A
Survival
12
Q
- LRFD is all about allowable loads
A
False
13
Q
- The reliability index is the number of times the measure of the variance is to the mean from the origin (t/f)
A
False
14
Q
- By how many percent is LRFD cheaper for a Tension Member Design compared to ASD if L/D=1
A
6
15
Q
- In ASD, the values of the coefficient on the Load Combinations are not based on probabilities. (T/F)
A
T
16
Q
- Flexural Torsional Buckling is more commonly known as __________ in beams.
A
- lateral torsional buckling, lateral-torsional buckling
17
Q
- Cc is a dimensionless parameter for slenderness in ASD (T/F)
A
- T
18
Q
- Flexural buckling limit states include elastic, inelastic, and __________.
A
- Yielding
19
Q
- When the actual width to thickness ratio is less than the limiting value set forth in the code, then the column will not experience ______________________.
A
- Local buckling
20
Q
- Given: Fy=100ksi Determine the slenderness ratio kL/r when Fcr=(2/3)Fy at the end of the pure elastic stage.
A
- 65.5
21
Q
- How many stiffened sections does an HSS rectangular section have?
A
- 4
22
Q
- The slender limits for stiffened element local buckling are always greater than the slenderness limits for unstiffened local buckling. (T/F)
A
- T
23
Q
- Which of the shapes is more vulnerable to lateral-torsional buckling?
A
- unequal angle
24
Q
- The slenderness ratio is measured by dividing __________ over the radius of gyration.
A
- effective length
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)
* F
26
11. The reason for a transition curve between the elastic and plastic stages for column behavior is mainly attributed to __________.
* Residual Stress
27
12. Residual stresses are compressive where the rate of cooling is fast. (T/F)
* T
28
13. Given: See Figure Question 11. Fy=100ksi Determine the slenderness ratio kL/r when all the fibers become plastic.
* 18.9
29
14. The limiting width to thickness ratio \u03BBr of a plate element subject to compression force is called __________.
* non-compact limit
30
15. How many unstiffened elements does a wide flange section have?
* 4
31
16. Flame cutting of steel plates introduces compressive stresses at the points of cutting. (T/F)
* F
32
17. Given: See Figure Question 11. Fy=100ksi What is the value of the tangent modulus at the transition stage?
* (1/8)E
33
18. Shape factors Q for slender elements are less than 1, while shape factors Q for non-slender elements are __________.
* equal to 1
34
19. Weak axis buckling is critical for columns under __________.
* axial compressive load only
35
20. Given: See Figure Question 11. Fy=100ksi Determine the slenderness ratio kl/r if there were no residual stress
53.5
36
21. How many number of supports does an unstiffened element have which makes it less stable than a stiffened element?
1
37
22. Built up shapes are more stable than rolled shapes in terms of local buckling.(t/f)
False
38
23. For local buckling failure on columns, the element subject to local loads must experience
uniform compression
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 ________________.
effective length
40
25. βc is a dimensionless parameter representing the LRFD parameter
slenderness
41
26. Given: See Figure Question 11. Fy=100ksi Determine the slenderness ratio kl/r when Fcr=(2/3)Fy at the elastoplastic stage.
23.2
42
27. Residual stresses are tensile at the joints but not at the free end. (T/F)
T
43
28. The point of load application at which no torsional behavior is induced in the member is called
none of the above
44
29. Inelastic column buckling is common for long, slender columns. (T/F)
F
45
30. Which of the shapes is more vulnerable to pure torsion?
Cruciform
