COMPRESSION MEMBERS - Eds 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 or Shear Center?
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 ———–
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
TRUE OR FALSE
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 _______.
None of the above
The part of the web cut from I shaped sections to produced T-shaped is called ——–
Stem
Slenderness ratio is measured by dividing —– over radius of gyration
Effective Length
Other name for a 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 a HSS rectangular section has?
4
When the actual element width-thickness ratio exceeds the limit, the element is tagged as ———
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 – to –
0 to 1
The point where a shear force acts without producing a twist known as the ———-
Shear Center
TRUE OR FALSE
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
TRUE OR FALSE
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
TRUE OR FALSE
Residual stress are tensile at the joints but not at the free end
True
TRUE OR FALSE
Inelastic column buckling is common for long slender columns
False
A pinned support resembles a beam with stiffness equivalent to ___
Zero (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 ineffective 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
TRUE OR FALSE
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?
Pipe
TRUE OR FALSE
For sway frame the value of k ranges from 0 to infinity.
False
TRUE OR 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
TRUE OR FALSE
The slender limit for stiffened elements local buckling is always greater than the slenderness limits for unstiffened 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
