Thaddeus Seminar Notes Flashcards
What is the recommended maximum span for a 2x12, and a 2x8?
Remember* add four feet to the depth and that is the typical span for wood joists.
2x12 can span 16’
2x8 can span 12’
What is the weight in pounds of a cubic foot of water?
62.4 Lbs
What is the weight in pounds of a cubic foot of concrete?
150 lbs
What is the weight in pounds of a cubic foot of steel?
490 lbs
What is the weight in pounds of a cubic foot of wood?
35.5 lbs
What is the weight in a sqft. pounds of a cubic foot of lightweight concrete?
100lbs
90lbs - 120lbs
What is the equation for the area of a trapezoid?
average base x height
What do density, plane, and linear correspond to units.
Density = #/ft^3
Plane = #/ft^2
Linear =#/ft
How do you calculate the stabilizing moment?
Factor of safety x Overturning moment = stabilizing moment
What is bridging?
Bridging is the bracing of spanning member perpendicular to joists/beams in order to prevent overturning (twisting)
How much concrete can a concrete truck hold?
9 - 12 Cubic Yards
What type of load is bad in a seismic?
Dead Load
In what region of the United States would you typically specify lightweight concrete?
West Coast (California) because lightweight concrete reduces the dead load on the building making it more necessary in areas that are prone to earthquakes.
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
a.) (62.4 lbs/ft^3) * (100sqft) / (12) = 520 lbs
If wind velocity doubles then the pressure is ________?
Squared
T/F Wherever moment is high shear is low.
True
What is the carbon content in steel?
.2% to .4%
What are the types of steel is used in hot rolled structural steel?
A-36 (Grade 36 = 36 kips per foot)
A-992 (Grade 50 = 50 kips per foot)
What are the types of steel is used in bolts?
A-307 (Home depot bolts NOT A CONSTRUCTION BOLT)
A-325
A-490
What are the types of steel is used in rebar?
Grade 40 smooth surface (40 kips per foot)
Grade 60 deformed surface (60 kips per foot)
What type of re-bar is typically used as stirrups?
3 and #4
What is the actual thickness of a #5 rebar?
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
What is the percentage of carbon in steel?
.2 - 2%
What is Hookes Law?
Hooke’s Law defines the elastic limit of materials and graphically expresses the yield, plastic (strain hardening), ultimate, and rupture
When designing a steel column that is long and susceptible to buckling what is the best way to prevent the column from buckling.
Increase the columns thickness or section modulus
T/F, Un-reinforced Concrete is a ductile material with a long plastic behavior before it ultimates.
False, concrete is not ductile and ruptures (fails) abruptly
What is the allowable stress design for steel?
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
How much should a handrail be able to resist in any direction as a concentrated load?
200#
How much should a handrail be able to resist as a uniform load?
50# per linear foot
What is a frame in which diagonal members are connected to a beam a short distance from the column joint.
Eccentrically braced frame
What is a frame in which members are subjected primarily to axial forces?
Braced frame
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.
Moment Frame
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?
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.
What is the recommended deflection criteria due to wind loading on a brick veneer wall utilizing a metal stud back up?
1/600, it is not recommended that masonry deflect more than 1/2000
