MTE Flashcards
The actual rupture strength of a plastic material is greater than the ultimate tensile strength if we consider the reduce area due to
Necking
Values for factor of safety in ASD is based on
All of the Above
Strain hardening is the result of dislocation or ____________ of the metal crystals.
Movement
LRFD is limited to inelastic behaviour
True
Strength Limit State is to collapse prevention as Serviceability Limit State is to
Function
Which of the following statement represents failure
NOTA
ASD differ primarily with LRFD in providing
Safety Factors
ASD is all about allowable stresses
True
What is the factor of safety for Tension Members in LRFD considering the combination U=1.4D
1.56
For high strength steel the plastic strain increases because of the increase on the ultimate strength
False
The limit state is the dividing between failure and
Survival
LRFD is all about allowable loads
False
Reliability index is the number of times the measure of the variance is to the mean from the origin
False
By how many percent is LRFD cheaper for a Tension Member Design compared to ASD if L/D=1
6%
In ASD the values of the coefficient on the Load Combinations are not based on probabilities.
True
Flexural Torsional Buckling is more commonly known as ___________ in beams
lateral torsional buckling, lateral-torsional buckling
Cc is a dimensionless parameter for slenderness in ASD (T/F)
T
Flexural buckling limit states includes elastic, inelastic and
Yielding
When the actual width to thickness ratio is less than the limiting value set forth on the code,
then the column will not experience ___________________________
Local Buckling
Given: Fy=100ksi
Determine the slenderness ratio kl/r when Fcr=(2/3)Fy at the end of pure elastic stage
65.5
How many stiffened section does a HSS rectangular section has?
4
The slender limits for stiffened element local buckling is always greater than the slenderness limits for unstiffened local buckling. (T/F)
T
Which of the shapes is more vulnerable to lateral-torsional buckling?
unequal angle
Slenderness ratio is measured by dividing ______________ over radius of gyration
effective length
Shanley concept introduces the critical load at which buckling begins and this is less the critical load of Engesser. (T/F)
F
The reason for a transition curve in between the elastic and plastic stage for a column behavior is mainly attributed to
Residual Stress
Residual stress are compressive where the rate of cooling is fast. (T/F)
T
Given: See Figure Question 11. Fy=100ksi
Determine the slenderness ratio kl/r when all the fibers become plastic.
18.9
The limiting width to thickness ratio λr of a plate element subject to compression force is called
non-compact limit
How many unstiffened element does a wide flange section has?
4
Flame cutting of steel plates introduces compressive stresses at the points of cutting. (T/F)
F
Given: See Figure Question 11. Fy=100ksi
What is the value of tangent modulus at the transition stage
(1/8)E
Shape factors Q for slender elements is less than 1 while shape factors Q for non-slender elements is ___________
equal to 1
Weak axis buckling is critical for columns under
axial compressive only
Given: See Figure Question 11. Fy=100ksi
Determine the slenderness ratio kl/r if there where no residual stress.
53.5
How many number of support does an unstiffened element has which makes it less stable than a stiffened element.
1
Built up shapes are more stable than rolled shapes in terms of local buckling.
False
For local buckling failure on columns, the element subject to local loads must experience
uniform compression
The local shape factor Qs for is based on average stress developed in the plate element while the local shape factor Qa is based on ___________________
effective area
λc is a dimensionless parameter representing the LRFD parameter for
slenderness
Given: See Figure Question 11. Fy=100ksi
Determine the slenderness ratio kl/r when Fcr=(2/3)Fy at the elasto plastic stage.
23.2
Residual stresses are tensile at the joints but not at the free end. (T/F)
T
The point of load application at which no torsional behavior is induced in the member is called
NOTA
Inelastic column buckling is common for long, slender columns. (T/F)
F
Which of the shapes is more vulnerable to pure torsion?
Cruciform
