Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Steel Design > Compression > Flashcards

Compression Flashcards

1
Q

Pcr

A

The load that is just large enough to maintain the defelcted shape when the load is removed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Critical Buckling load equation for elastic member

A

Pcr = (π2)EI / L2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Types of Failure for axially loaded columns

A
  1. Flexural Buckling
  2. Local Buckling
  3. Torsion Buckling
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

A columns tendency to buckle is measured by its __________

A

Slenderness ratio = L/rmin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Elastic Critical buckling stress equation.

A

FCR = PCR / A = π2*E / (L/r)2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Critical Buckling load equation for inelastic buckling

A

Pcr = (π2)EtI / L2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Fcr

A

Critical Compressive or bending stress used to determine nominal strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Nominal Compressive strength based on the limit state of buckling AISC Equation E3-1

A

Pn = Fcr*Ag

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Pu <= Φc*Pn

A

Nominal Compressive strength LRFD AISC Equation E3-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Pu means

A

Sum of factored loads LRFD

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Φc means

A

LRFD Resistance factor for compression = .90

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Define Φc *Pn

A

Design compressive strength LRFD

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Pa <= Pn/ Ωc

A

Allowable Compressive strength ASD AISC Equation E3-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Pa means

A

applied axial service load= required strength ASD

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Ωc means

A

ASD Safety factor for compression = 1.67

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Pn/ Ωc

A

Allowable compressive strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Fe <= Pe/ A = π2*E/ (Lc/r)2

A

Euler buckling stress AISC EQUATION E3-4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Lc & KL means

A

Effective Length of compression member

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Fcr=.877*Fe

A

Critical stress for elastic columns

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Fcr=(.658(Fy/Fe))*Fy is the equation for

A

Critical stress for elastic columns

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Fa means

A

Allowable axial compressive stress

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

When Lc/r is less than or equal to 4.71sqrt(E/Fy)

A

Use AISC equation 3-2,

Fcr=(.658(Fy/Fe))*Fy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

When Lc/r is greater than 4.71sqrt(E/Fy)

A

Use AISC equation E3-3, Fcr=.877*Fe

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

The critical buckling load is a function of…

A

the modulus of elasticity, and not the yield stress or ultimate tensile strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Values of K can be determined with

A

Table C-A-7.1 in the commentary to AISC spec appendix 7

26
Q

K is defined as___

A

Effective length factor

27
Q

The effective length factor for FIXED-PINNED compression member is ____

28
Q

The effective length factor for FIXED-FIXED compression member is ____

29
Q

The use of the effective length KL in place of the actual length_________

A

in no way alters the relationship in the equations.

30
Q

Steps to compute design compressive strength of a column

A
  1. calculate effective length
  2. Calculate maximum slenderness ration L/r compare to limit of 200 if over choose another shape
    3.Compare L/r
31
Q

The upper limit for the slenderness ratio L/r is _______ becasue members that are any more slender will have little strength and not be economical.

32
Q

Fy for A36 steel.

33
Q

Fy for A572 steel.

34
Q

Fy for A992 steel.

35
Q

Fu for A36 steel.

A

58 to 80 ksi

36
Q

Fu for A572 steel.

37
Q

Fu for A992 steel.

38
Q

Fa =.6* Fcr

A

Allowable stress ASD

39
Q

Fa*Ag

A

Allowable strength ASD

40
Q

Square structural tubes HSS are efficiant shapes for compression members becasue________

41
Q

Limiting values of width to thickness ratios are given in______

42
Q

For compression members shapes are classified as_____

A

1.Slender
2. Non slender

43
Q

If a shape is slender, its strength limit state is_______

A

Local Buckling

44
Q

The width to tickness ratio of a beam flange in relation ot its web is defined as _____

A

= λ=b/t = bf/2* tf

45
Q

If λ is less than or equal to λr then the shape is_______

A

non slender

46
Q

For beams a shape can be______

A
  1. compact
  2. non compact
  3. slender
47
Q

Steps to check for local stability

A
  1. calculate width to thickness bf/2* tf
  2. Calculate upper compression limit λr from AISC B4.1
  3. Calculate height to thickness
  4. if the height and width to thickness is less than or equal to the upper limit its OK
48
Q

In the steel manual, shapes that are slender for compression are indicated with a _______

A

Footnote C

49
Q

Define be

A

Reduced effective width of the element

50
Q

Define t

A

t is the design thickness of the element

51
Q

When h/t is bigger than the upper limit (#*sqrt(E/Fy) i.e. λ >λr then….

A

the larger dimension element is slender and the local buckling strength must be computed

52
Q

When λ< λr*sqrt(Fy / Fcr) then what is true about be?

A

It is equal to b

53
Q

When λ> λr*sqrt(Fy / Fcr) then what is true about be?

A

It must be computed using be= b(1 - c1(sqrt(Fel / Fcr))sqrt(Fel / Fcr)

54
Q

Define c1

A

effective width imperfection adjustment factor from AISC Table E7.1

55
Q

Define Fel

A

Elastic local buckling stress = (c2(λr/λ))2Fy

56
Q

(c2(λr/λ))2Fy

A

Elastic buckling stress equation AISC equation E7-5

57
Q

AISC Table 4-1A shows_____

A

Width to thickness ratios for compression members

58
Q

AISC table 6-2 shows…

A

Available axial compression and bending strengths of all shapes that have a Fy of 50ksi

59
Q

Design steps to select shape for compression using tables

A
  1. Find the sum of the factored loads Pu
  2. enter the table 6-2 with the Length
60
Q

If the capacity with respect to x-axis buckling is desired enter the table with_______equation

A

Lc = Lcx/(rx/ry)

61
Q

Define Pn

A

nominal strength in tension or compression

Steel Design (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions