Thaddeus Seminar Notes

Question 1

What is the recommended maximum span for a 2x12, and a 2x8?

Answer 1

Remember* add four feet to the depth and that is the typical span for wood joists.
2x12 can span 16’
2x8 can span 12’

Question 2

What is the weight in pounds of a cubic foot of water?

Answer 2

62.4 Lbs

Question 3

What is the weight in pounds of a cubic foot of concrete?

Answer 3

150 lbs

Question 4

What is the weight in pounds of a cubic foot of steel?

Answer 4

490 lbs

Question 5

What is the weight in pounds of a cubic foot of wood?

Answer 5

35.5 lbs

Question 6

What is the weight in a sqft. pounds of a cubic foot of lightweight concrete?

Answer 6

100lbs

90lbs - 120lbs

Question 7

What is the equation for the area of a trapezoid?

Answer 7

average base x height

Question 8

What do density, plane, and linear correspond to units.

Answer 8

Density = #/ft^3
Plane = #/ft^2
Linear =#/ft

Question 9

How do you calculate the stabilizing moment?

Answer 9

Factor of safety x Overturning moment = stabilizing moment

Question 10

What is bridging?

Answer 10

Bridging is the bracing of spanning member perpendicular to joists/beams in order to prevent overturning (twisting)

Question 11

How much concrete can a concrete truck hold?

Answer 11

9 - 12 Cubic Yards

Question 12

What type of load is bad in a seismic?

Answer 12

Dead Load

Question 13

In what region of the United States would you typically specify lightweight concrete?

Answer 13

West Coast (California) because lightweight concrete reduces the dead load on the building making it more necessary in areas that are prone to earthquakes.

Question 14

On a roof that is 100 sqft. How much does 1” of rain weigh?

a. ) 520 lbs
b. ) 6,420 lbs
c. ) 5.2 lbs

Answer 14

a.) (62.4 lbs/ft^3) * (100sqft) / (12) = 520 lbs

Question 15

If wind velocity doubles then the pressure is ________?

Answer 15

Squared

Question 16

T/F Wherever moment is high shear is low.

Answer 16

True

Question 17

What is the carbon content in steel?

Answer 17

.2% to .4%

Question 18

What are the types of steel is used in hot rolled structural steel?

Answer 18

A-36 (Grade 36 = 36 kips per foot)

A-992 (Grade 50 = 50 kips per foot)

Question 19

What are the types of steel is used in bolts?

Answer 19

A-307 (Home depot bolts NOT A CONSTRUCTION BOLT)
A-325
A-490

Question 20

What are the types of steel is used in rebar?

Answer 20

Grade 40 smooth surface (40 kips per foot)

Grade 60 deformed surface (60 kips per foot)

Question 21

What type of re-bar is typically used as stirrups?

Answer 21

3 and #4

Question 22

What is the actual thickness of a #5 rebar?

Answer 22

5/8” - Rebar is sized in 1/8” increments and the number corresponds to the diameter in eights. Rebar comes in sizes #3 - #8, #10, #11, #14, #18

Question 23

What is the percentage of carbon in steel?

Answer 23

.2 - 2%

Question 24

What is Hookes Law?

Answer 24

Hooke’s Law defines the elastic limit of materials and graphically expresses the yield, plastic (strain hardening), ultimate, and rupture

Question 25

When designing a steel column that is long and susceptible to buckling what is the best way to prevent the column from buckling.

Answer 25

Increase the columns thickness or section modulus

Question 26

T/F, Un-reinforced Concrete is a ductile material with a long plastic behavior before it ultimates.

Answer 26

False, concrete is not ductile and ruptures (fails) abruptly

Question 27

What is the allowable stress design for steel?

Answer 27

The ASD of steel limits the amount of load that is allowed on any grade of steel. It is a factor of safety that limits loads to 60% for compression and tension, and 40% for shear

Question 28

How much should a handrail be able to resist in any direction as a concentrated load?

Answer 28

200#

Question 29

How much should a handrail be able to resist as a uniform load?

Answer 29

50# per linear foot

Question 30

What is a frame in which diagonal members are connected to a beam a short distance from the column joint.

Answer 30

Eccentrically braced frame

Question 31

What is a frame in which members are subjected primarily to axial forces?

Answer 31

Braced frame

Question 32

What is a frame in which members and joints are capable of resisting forces by flexure as well as along the axis of the member.

Answer 32

Moment Frame

Question 33

When calculating base shear in a moment frame structure with 2 bays or (three columns), what do you divide the sum of the base shear by?

Answer 33

2, base shear in a rigid or moment frame is always divided by the number of bays, not the number of columns. When calculating for the base shear at the middle column, and the base shear of both bays.

Question 34

What is the recommended deflection criteria due to wind loading on a brick veneer wall utilizing a metal stud back up?

Answer 34

1/600, it is not recommended that masonry deflect more than 1/2000