FLEXURAL MEMBERS - Eds Flashcards
Given the isosceles triangle with a base b=10 and a height h=10 inches determine the plastic modulus Z if Fy= 100 ksi
97.631
A box section is 8 times stronger than a wide flange section because ____
All elements are stiffened
TRUE OR FALSE
A stiffened element is more critical than an stiffened element in terms of local buckling
False
When a section behaves in the plastic mode, the neutral axis divides the section into two _____
equal areas
A compact section satisfies the condition that the width to thickness ratio of a plate element shall not exceed the limit for width to thickness ratio to ensure that ______
the element is capable of large strain prior to local buckling
The moment of inertia (I) of an isosceles triangle with respect to the centroid is _____
bh^3/36
The limit for the plastic moment Mp is ____
1.5My
Given the isosceles triangle with a base b=10 and a height h=10 inches determine the location of its plastic centroid from the top
3.536
Given the isosceles triangle with a base b=10 and a height h=10 inches determine the location of its geometric centroid from the top
20/3
Main or primary flexural members are called _____
beams
Lateral torsional buckling is primarily due to the lateral translation of _________
the compression flange
Given the isosceles triangle with a base b=10 and a height h=10 inches determine the section modulus S if Fy= 100 ksi
83.333
TRUE OR FALSE
Uniformly compressed elements have no compact limits
False
Shape factor is simply a ratio of ____
either of the two above
Beams with continuous lateral support such as those which carry continuous slab are said to be ________
Laterally supported
For a simply supported beam (pin ended ) with no transvere loads and with eqaual end moments in single curvature, the value of Cb is ____
1.0
The yield strength of a material is based on the _____
upper yield point
The factor that takes into account the non-uniform bending moment distribution over an unbraced length Lb is _____
Cb
Given the isosceles triangle with a base b=10 and a height h=10 inches determine the shape factor if Fy= 100 ksi
1.172
The moment of inertia I of an isosceles triangle with respect to its base is ________
bh^3/12
The value of Fr (residual stress) for welded built-up shapes in the old AISC code is _____
16.5
TRUE OR FALSE
Flexurally compressed elements have no non-compact limits
True
For a simply supported beam (pin ended ) with no transverse loads and with eqaual end moments in reverse curvature, the value of Cb is ____
1.32
Beams w/ braced length Lb greater than that required are said to be ____
Laterally unsupported
The number of plastic hinge is determined by the degree of indeterminacy plus ___
1
In the LRFD criteria for strength of flexural members, the main objective is to determine its _____
Moment Capacity
Perfectly plastic behavior means that the material will not rupture at a specified ____
Strain
A member subjected to some degree of bending and/or flexure is called a
Beam
TRUE OR FALSE
A plastic moment is the largest moment which could be developed by the section.
TRUE
