1

Question 1

structural elements subjected only to compressive forces

Answer 1

compression members

Question 2

T/F, bending is primary due to accidental eccentricity of load

Answer 2

F, secondary

Question 3

most common type of compression member

Answer 3

column

Question 4

if a column is subjected to bending, it is called ______________.

Answer 4

beam column

Question 5

smaller compression member not classified as column

Answer 5

strut

Question 7

T/F, the grade of steel need not to be known in the investigation for stability.

Answer 7

T

Question 7

If a member becomes unstable due to large axial load, the member is said to have __________ and the corresponding load is called _________________.

Answer 7

buckled, critical buckling load

Question 8

The load at which buckling occurs is a function of _____________________.

Answer 8

Slenderness

Question 8

For extremely stocky member, failure by ____________ will occur, not buckling.

Answer 8

compressive yielding

Question 8

T/F , For a stocky member, lesser load is needed for instability.

Answer 8

F, larger

Question 8

In Euler’s equation, the ratio ____ is the slenderness ratio and is the measure of a member’s slenderness, with _____values corresponding to slender members

Answer 8

L/r, larger

Question 9

T/F, For stocky members/ less slender members, the Euler’s equation does not give reliable result.

Answer 9

T

Question 10

For stocky members, buckling occurs beyond the ____________ limit.

Answer 10

proportional

Question 11

In 1889, Friedrich Engesser proposed the use of _________________________ for values of f between Fpl and Fy.

Answer 11

variable tangent modulus

Question 12

The _______________ completely describes the strength of a column of a given material.

Answer 12

column strength curve

Question 13

Value of effective length factor

both sides fixed

Answer 13

0.65

Question 14

Value of effective length factor

one side pinned, one side fixed

Answer 14

0.80

Question 15

Value of effective length factor

one side fixed, one side rotation fixed and translation free

Answer 15

1.2

Question 16

Value of effective length factor

one side fixed, one side rotation free and translation free

Answer 16

2.1

Question 17

Value of effective length factor

two sides pinned

Answer 17

1

Question 18

Value of effective length factor

one side pinned, one side rotation fixed and translation free

Answer 18

2

Question 19

sum of the factored loads

Answer 19

Pu

Question 20

Sum of the service loads

Answer 20

Pa

Question 21

resistance factor for compression

Answer 21

0.9

Question 22

safety factor for compression

Answer 22

1.67

Question 23

design compressive strength

Answer 23

OcPn

Question 24

allowable compressive strength

Answer 24

Pn/basta

Question 25

According to NSCP 505.3, the nominal compressive strength shall be determined based on the limit state of _____________ buckling

Answer 25

flexural

Question 26

What is the flexural buckling stress

Answer 26

Fcr

Question 27

At the boundary between _______and ______columns, the equations for Fcr gives the same value of Fcr

Answer 27

inelastic, elastic

Question 28

_______________ are efficient shapes for compression members because ry = rx and the strength is the same for both axes

Answer 28

square structural tubes

Question 29

the mode of failure considered so far is only ___________________ as the member is subjected to flexure or bending when it becomes unstable

Answer 29

flexural buckling

Question 30

for elements with thin cross section, ___________ occurs.

Answer 30

local buckling

Question 31

the measure of the susceptibility to local buckling is the _________________ of cross sectional element

Answer 31

width to thickness

Question 32

unsupported along one edge parallel to the direction of load

Answer 32

unstiffened elements

Question 33

supported along both edges

Answer 33

stiffened elements

Question 34

for compression members, shapes are classified as

Answer 34

slender and nonslender

Question 35

Its strength limit state is LOCAL BUCKLING and the corresponding reduced strength must be computed

Answer 35

slender elements

Question 36

for a section to qualify as ________, its flanges must be continuously connected to the web(s) and the width - thickness ratio of its compression elements must not exceed the limiting width - thickness, yp, ratio from table 502.4.1

Answer 36

compact

Question 37

If the width-thickness ratio of one or more compression elements exceeds yp, but does not exceed yr, the section is _____________

Answer 37

non compact

Question 38

if the width to thickness ratio of any element exceeds yr, the section is referred to as ______________________.

Answer 38

slender element section

Question 39

For I shapes, the projecting flange is considered to be an _____________ and its width can be taken as half of the full nominal width

Answer 39

unstiffened element

Question 40

limiting width to thickness ratio are either _________ or _________

Answer 40

compact, non compact

Question 40

It is permissible to use a cross sectional shape that does not satisfy the width to thickness ratio requirements, but it is not permitted to carry a large _____

Answer 40

load

Question 41

The value of Q for members with compact and non compact sections is

Answer 41

1

Question 42

many of the shapes commonly used as columns are not slender, thus, reduction is not needed, that includes most

Answer 42

W shapes

Question 43

a large number of ______________, double angles, and tees have slender elements

Answer 43

HSS

Question 44

for unstiffened element, for flanges of I shaped beams and tees, the width b is ____ of the full flange width bf

Answer 44

1/2

Question 45

for unstiffened element, for legs of angles and flanges of channels and zees, the with b is the _______ nominal dimension

Answer 45

full

Question 46

for unstiffened element, for plates, the width b is the distance from the _____ edge to the first row of fasteners or line of _______.

Answer 46

free, welds

Question 47

for unstiffened element, for stems of tees, d is taken as the ____ nominal depth of the section.

Answer 47

full

Question 48

Qs is what you calculate for slender _____________ elements

Answer 48

unstiffened

Question 49

Qa is what you calculate for slender ____________ elements

Answer 49

stiffened