Structural Engineering

Question 1

READ CAREFULLY

Answer 1

Dumbass

Question 2

When given dead and live loads for beam fixed to wall

Answer 2

Use live only

Question 3

For lateral bucking coefficient use

Answer 3

Structural design loads for W

Question 4

Assume base and height by

Answer 4

Respectively
Ie

Base x height
10 in x 15 in

Base = 10
Height =15

Question 5

For mid span supported columns

Answer 5

L/2

Question 6

G

Answer 6

Sidesway

Question 7

For fixed condition

Answer 7

G = 1

Question 8

To find effective length factor, k

Answer 8

Use table that align with G

Question 9

Find G

Answer 9

G = τ(Σ(I_c/L-c)/Σ(I_g/L_c))

Question 10

r

Answer 10

Radius of gyration

Question 11

Lots of tables to look at

Answer 11

Critical stress

Question 12

r, radius of gyration

Answer 12

(I/A)^.5

Question 13

For pinned connected assume G =

Answer 13

10

Question 14

For complete trusses (ie no by section or anything. Looking at it as a whole)

Answer 14

Solve like normal with Σ of forces and moments and solve

Question 15

Vertical deflection

Answer 15

Find vertical loads
Multiply by given FLs
Sum FLs
Put in ΔL found under tress deflection

Question 16

Vertical loads

Answer 16

Given loads/ magnitude of point load

Question 17

When point load is vertical and finding horizontal deflection

Answer 17

Use equilibrium at each point
Adjust forces on beams with ratios of lengths
Multiply virtual forces by given member forces and sum
Put into Δ truss deflection Eq

Question 18

For plane frame consisting of two rigid bars

Answer 18

Find moment of both bars
NOTE: pinned portion gets a force and reaction moment
Non pinned portion gets only force moment

Question 19

To find deflection

Answer 19

Find moment equations with x as the length
Sum integrals where each bar has a moment integral

Question 20

Reaction forces

Answer 20

List just external REACTION forces from supports

Question 21

Single members have no

Answer 21

Internal forces

Question 22

For degree of indeterminate

Answer 22

Find all reaction forces
(Pins in the middle will count for only 2)

Question 23

Effective length

Answer 23

kL

Factor of length = k

Question 24

Determine k for a column

Answer 24

By table about translation/rotation free vs fixed

Question 25

For lower W shapes
W14 W12 or W10

Answer 25

Use just kL and cross check with table. r is minimal so unnecessary

Question 26

When no reduction in stiffness

Answer 26

τ =1

Question 27

When finding G multiply top bar by

Answer 27

2 even if it’s just one

Question 28

For available strength of top half of beam

Answer 28

Find radii of gyration in both directions of W beam in question

Effective length if W beam:
KL = (kL)_x/(r_x/r_y)

Find beam in table

Question 29

Effective area for a connection

Answer 29

A_n = shortest width of failure path * thickness of member

Flat bars (plate)

Question 30

Available strength T_n

Answer 30

φ_yF_yA_g

In book but doesn’t say to multiply

Question 31

For connection of members

Answer 31

Make sure to combine areas for number similar members
(Ie L shaped areas that are bolted to a plate, two L shapes means two areas)

Question 32

Weight can also be called

Answer 32

Dead load

Question 33

WATCH UNITS

Answer 33

Dumbass

Question 34

Use old combinations for w or U

Answer 34

1.2D + 1.5L

Question 35

Max shear in concrete V_u

Answer 35

.5U or .5w

Question 36

Ultimate moment

Answer 36

P_u*e

Question 37

ρg for cross-section area ratio

Answer 37

Graph found
REMEMBER TO INCLUDE φ
(Found above graph)

Question 38

For concrete with bars
Finding area of bars

Answer 38

A = ρgbh

A/n =area of each bar
n = number of bars

Question 39

If a simply supported reinforced concrete beam is subject to a uniformly distributed load, where is tensile reinforcing steel needed?

Answer 39

At the bottom of the beam section

Question 40

Converting lbs/ft^3 to kip/ft

Answer 40

Multiply by each dimensions divided by 12 (ie 20/12*30/12 for dimensions do 20x30)
Then divide by 1000

Question 41

Method of virtual work assumes

Answer 41

Conservation of energy

Question 42

Loop pipes

Answer 42

Literally looping pipes

Question 43

Pipe nodes

Answer 43

Corners

Question 44

Pipes

Answer 44

Parts of loops

Question 45

As rainfall increases

Answer 45

Uniformity decreases

Question 46

Watershed has nothing to do with

Answer 46

Uniformity

Question 47

For LRFD multiple V by

Answer 47

φ

Equals 1 for I shaped beams

Question 48

For tension members
Under yielding/rupture

Answer 48

Don’t multiply by φ

Question 49

Trick for controlling condition factors

Answer 49

Middle section (if one)
G top = G bottom

Question 50

Radius of gyration
Which is weak?

Answer 50

Smaller number is weaker

Question 51

A two-dimensional structure with four or more external reaction forces:

Answer 51

Cannot be analyzed using statics

Question 52

When asked about max loads look at

Answer 52

Design Eqs

Question 53

For yielding in beams do you use φ

Answer 53

Yes

Question 54

F in yielding moment can also be

Answer 54

Bending stress

Based on what’s given

Question 55

For bucking coefficient use

Answer 55

The moment RATIOS with the max

Question 56

Using tabulated values for the torsional buckling coefficient based on load and bracing conditions

Answer 56

Best way to find the coefficient?

Question 57

Slenderness ratio lower than 50 means

Answer 57

Short steel column

Question 58

Another way for moment with T and d

Answer 58

T is the force
d is the depth of the W shape

Question 59

A_n

Answer 59

Thickness*shortest fail path