Compression Members Flashcards
Aside from tables/charts and equations, k factors may be obtained using
NOMOGRAPHS
the limiting width to thickness ratio ƛr of a plate element subject to compression force is called
NON COMPACT LIMIT
The point of load application at which no torsional behavior is induced in the member is called
None of the above (Shear center)(not sure)
For local buckling failure on columns the elements subject to local loads must experience
Uniform Compression
ƛc is a dimensionless parameter representing the LRFD parameter for S
SLENDERNESS
Flame cutting of steel plates introduces compressive stresses at the points of cutting
T
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 AREA
Built up shapes are more stable than rolled shapes in terms of Local buckling
F
Flexural Torsional Buckling is more commonly known as _______in beams
LATERAL TORSIONAL BUCKLING
The more axis of symmetry for a section, the higher the risk of falling in torsion
TRUE
Flexural buckling limit states includes elastic,inelastic and
YIELDING
The following are factors affecting the effective length factor k except for
NOTA
The part of the web cut from I shaped sections to produced Tshaped is called
STEM
Slenderness ratio is measured by dividing ____over radius of gyration
EFFECTIVE LENGTH
Other name for braced column is ____________column
NON SWAY
Other name for a sway column is __________column
UNBRACED
The reason for a transition curve in between the elastic and plastic stage for a column behavior is mainly attributed to
RESIDUAL STRESS
How many stiffened section does an HSS rectangular section has
4
When the actual element width-thickness ratio exceeds the limit,the elements is tagged as a
SLENDER ELEMENT
Stiffened elements are those which has
SUPPORT AT BOTH ENDS
Weak axis buckling is critical for columns under
Axial compressive load only
Flexural torsional buckling is partly attributed to a phenomenon known as
SHEAR FLOW
For non sway frames the value of k ranges From
0 to 1 (not sure)
The point where a shear force acts without producing a twist known as the
SHEAR CENTER
Cc is a dimensionless parameter for slenderness in ASD
TRUE
A 2in x 2in x ¼ angle bar with a length of 24 inches has width-thickness ratio of
8
Residual stress are compressive where the rate of cooling is fast
TRUE
How many number of support does an unstiffened elements has which makes it less stable than a stiffened element
1
The value of the shape factor Q decreases as the width-thickness ratio
INCREASES
Residual stress are tensile at the joints but not at the free end
TRUE
Inelastic column buckling is common for long slender columns
FALSE
A pinned support resembles a beam with stiffness equivalent to
0
Projecting elements from FAP are unstiffened elements where Fap means
None of the above
(Flange, Angle, and Plates)
How many unstiffened elements does a wide flange section has
4
The effective area of a stiffened elements is computed by subtracting the eneffective area from the
GROSS AREA
The shape factor Qa represents the
Ratio of effective area to gross area
The shape factor Qs represent the
Ratio of effective stress to max stress
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
Shanley concept introduces the critical load at which buckling begins and this is less the critical load of Engesser
FALSE
Which of the shapes is more vulnerable to pure torsion
Cruciform
For sway frame the value of k ranges from 0 to infinity
FALSE
Unstiffened elements absorbs higher stresses at rigid ends
TRUE
Which of the shapes is more vulnerable to lateral torsional buckling?
Unequal angle
A fixed support resembles a beam with stiffness equivalent to
Infinity
The slender limit for stiffened elements local buckling is always greater than the slenderness limits for unstiffined local buckling
True
Shape factor Q for slender elements is less than 1 while shape factor Q for non slender elements is
Equal to 1
Given: Fy=100ksi
Determine the slenderness ratio kl/r when Fcr=(2/3)Fy at the end of pure elastic stage.
65.5
Given: See Figure Question 11. Fy=100ksi
Determine the slenderness ratio kl/r when all the fibers become plastic.
18.9
Given: See Figure Question 11. Fy=100ksi
What is the value of tangent modulus at the transition stage.
(1/8)E
Given: See Figure Question 11. Fy=100ksi
Determine the slenderness ratio kl/r if there where no residual stress.
53.5
elasto plastic stage
23.2
