QUIZ 3 Flashcards
Given the isosceles triangle with a ase b=10 and a height h=10 inches, determine the plastic modulus Z if Fy=100ksi
97.631
A box section is 8 times stronger than a wide flange section because
all elements are stiffened
A stiffened element is more critical than unstiffened element in terms of local buckling
false
When an 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-thickness ratio of a plate element shall not exceed the limit width to thickness ratio to ensure that
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 heigh 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 heigh 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 ase b=10 and a height h=10 inches, determine the section modulus S if Fy=100ksi
83.333
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 slabs are said to be
laterally supported
For a simply supported beam (pin ended) with no transverse loads and with equal end moments in single curvature, the value of Cb is
1.0
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 ase b=10 and a height h=10 inches, determine the shape factor if Fy=100ksi
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
Flexurally compressed elements have no compact limits
true
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
Beams with 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
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
A plastic moment is the largest moment which could be developed by a section
true
