EXAM Flashcards
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
Q
- Shanley’s concept introduces the critical load at which buckling begins, and this is less than the critical load of Engesser. (T/F)
A
- F
26
Q
- The reason for a transition curve between the elastic and plastic stages for column behavior is mainly attributed to __________.
A
- Residual Stress
27
Q
- Residual stresses are compressive where the rate of cooling is fast. (T/F)
A
- T
28
Q
- Given: See Figure Question 11. Fy=100ksi Determine the slenderness ratio kL/r when all the fibers become plastic.
A
- 18.9
29
Q
- The limiting width to thickness ratio \u03BBr of a plate element subject to compression force is called __________.
A
- non-compact limit
30
Q
- How many unstiffened elements does a wide flange section have?
A
- 4
31
Q
- Flame cutting of steel plates introduces compressive stresses at the points of cutting. (T/F)
A
- F
32
Q
- Given: See Figure Question 11. Fy=100ksi What is the value of the tangent modulus at the transition stage?
A
- (1/8)E
33
Q
- Shape factors Q for slender elements are less than 1, while shape factors Q for non-slender elements are __________.
A
- equal to 1
34
Q
- Weak axis buckling is critical for columns under __________.
A
- axial compressive load only
35
Q
- Given: See Figure Question 11. Fy=100ksi Determine the slenderness ratio kl/r if there were no residual stress
A
53.5
36
Q
- How many number of supports does an unstiffened element have which makes it less stable than a stiffened element?
A
1
37
Q
- Built up shapes are more stable than rolled shapes in terms of local buckling.(t/f)
A
False
38
Q
- For local buckling failure on columns, the element subject to local loads must experience
A
uniform compression
39
Q
- The local shape factor Qs is based on average stress developed in the plate element while the local shape factor Qa is based on ________________.
A
effective length
40
Q
- βc is a dimensionless parameter representing the LRFD parameter
A
slenderness
41
Q
- Given: See Figure Question 11. Fy=100ksi Determine the slenderness ratio kl/r when Fcr=(2/3)Fy at the elastoplastic stage.
A
23.2
42
Q
- Residual stresses are tensile at the joints but not at the free end. (T/F)
A
T
43
Q
- The point of load application at which no torsional behavior is induced in the member is called
A
none of the above
44
Q
- Inelastic column buckling is common for long, slender columns. (T/F)
A
F
45
Q
- Which of the shapes is more vulnerable to pure torsion?
A
Cruciform
