QUIZ 4 STEEL (PART 1) Flashcards
The value of Fr (residual stress) for welded built-up shapes in the old AISC code is
0.7Fy / 16.5
For a simply supported beam (pin ended) with no transverse loads and with equal end moments in single curvature, the value of Cb is
1
For a simply supported beam (pin ended) with no transverse loads and with equal end moments in reverse curvature, the value of Cb is
1.32
The number of plastic hinge is determined by the degree of indeterminacy plus
1
A stiffened element is more critical that an unstiffened elements in terms of local buckling
False
A compact section satisfies the condition that the width-thickness ratio of a plate elements shall not exceed the limit for width to thickness ratio to ensure that
both
The limit for the plastic moment is
1.5My
Flexurally compressed elements have no non-compact limits
False
A moment-resisting frame or a beam-column frame is said to be braced if there is no
sidesways or lateral translation
A column is a part of MRF. Determine the moment magnification factor B2 if the column is not braced against sidesway.
NOTE: the column is pinned at both ends and the end moments produces reverse curvature.
2.22
When a section behaves in the plastic mode, the neutral axis divides the section into two
Equal areas
The interaction equation below is
(Pq/Pr + Mq/Mr) < 1.0
Linear
Perfectly plastic behavior means that the material will not rupture at a specified
Strain
In a beam-column, a secondary moment is caused by the
Primary deflection
The AISC value for Cm shown below is a modification which must always be
Less than or equal to one
A column is a part of MRF. Determine the moment magnification factor B1 if the column is not braced against sidesway.
NOTE: the column is pinned at both ends and the end moments produces reverse curvature.
0.89
What is the relative stiffness of a fixed joint
0
The factor that takes into account the non-uniform bending moment distribution over an unbraced length Lb is
Cb
In a beam-column, a primary moment is caused by the
Primary loads
Moment magnification may not be required if second order analysis is used
True
A member of a structure is safe if the ratio of the P load with the resistance R is less than or equal to
one
The yield strength of a material is based on the
Upper yield point
The range of values of the effective length factor k for sway frame is
1 < k <20
Shape factor is simply a ratio of
either
A member subjected to some degree of bending and/or flexure is called
beam
What is the relative stiffness or a roller joint (roller free to move laterally)
infinity
Cm=1 is a conservative value for braced and unbraced frame
False
A plastic moment is the largest moment which could be developed by the section
True
What is the effective length factor k of a column fixed at one end and roller (free to move laterally) at the other end
2.0
In the LRFD criteria for strength of flexural members, the main objective is to determine
moment capacity
