QUIZ 3

Question 1

Given the isosceles triangle with a ase b=10 and a height h=10 inches, determine the plastic modulus Z if Fy=100ksi

Answer 1

97.631

Question 2

A box section is 8 times stronger than a wide flange section because

Answer 2

all elements are stiffened

Question 3

A stiffened element is more critical than unstiffened element in terms of local buckling

Answer 3

false

Question 4

When an section behaves in the plastic mode, the neutral axis divides the section into two

Answer 4

equal areas

Question 5

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

Answer 5

element is capable of large strain prior to local buckling

Question 6

The moment of inertia (I) of an isosceles triangle with respect to the centroid is

Answer 6

bh^3/36

Question 7

The limit for the plastic moment Mp is

Answer 7

1.5My

Question 8

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

Answer 8

3.536

Question 9

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

Answer 9

20/3

Question 10

Main or primary flexural members are called

Answer 10

beams

Question 11

Lateral torsional buckling is primarily due to the lateral translation of the

Answer 11

Compression Flange

Question 12

Given the isosceles triangle with a ase b=10 and a height h=10 inches, determine the section modulus S if Fy=100ksi

Answer 12

83.333

Question 13

Uniformly compressed elements have no compact limits

Answer 13

false

Question 14

Shape factor is simply a ratio of

Answer 14

either of the two above

Question 15

Beams with continuous lateral support such as those which carry continuous slabs are said to be

Answer 15

laterally supported

Question 16

For a simply supported beam (pin ended) with no transverse loads and with equal end moments in single curvature, the value of Cb is

Answer 16

1.0

Question 17

The yield strength of a material is based on the

Answer 17

upper yield point

Question 18

The factor that takes into account the non-uniform bending moment distribution over an unbraced length Lb is

Answer 18

Cb

Question 19

Given the isosceles triangle with a ase b=10 and a height h=10 inches, determine the shape factor if Fy=100ksi

Answer 19

1.172

Question 20

The moment of inertia (I) of an isosceles triangle with respect to its base is

Answer 20

bh^3/12

Question 21

The value of Fr (residual stress) for welded built-up shapes in the old AISC code is

Answer 21

16.5

Question 22

Flexurally compressed elements have no compact limits

Answer 22

true

Question 23

For a simply supported beam (pin ended) with no transverse loads and with equal end moments in reverse curvature, the value of Cb is

Answer 23

1.32

Question 24

Beams with braced length Lb greater than that required are said to be

Answer 24

laterally unsupported

Question 25

The number of plastic hinge is determined by the degree of indeterminacy plus

Answer 25

1

Question 26

In the LRFD criteria for strength of flexural members, the main objective is to determine

Answer 26

moment capacity

Question 27

Perfectly plastic behavior means that the material will not rupture at a specified

Answer 27

strain

Question 28

A member subjected to some degree of bending and/or flexure is called a

Answer 28

beam

Question 29

A plastic moment is the largest moment which could be developed by a section

Answer 29

true