Chapter 4-5 Flashcards
Trusses, Steel
How much does a W14 x 211 weigh per foot?
211 LBS / Ft.
As a rule of thumb, what is the formula to calculate the nominal truss depth, across a specific length?
d= L / 10
Steel is most economical in what spans?
25-40
What is the ideal rectilinear proportion for a steal framing bay?
1.25 to 1.0 - 1.5 to 1
What is the typical spacing between beam in a structural framing system.
6’-15’ with the most economical range being 8’-10’
What is the general rule for the sizing of structural members?
1” of Depth for every 2’ of span
How much does a W12x35 weigh?
35 pounds per linear foot
what is the formula for the max moment on a beam?
maxM= (W L^2) / 8
What is the percentage of maximum deflection that can be cambered out of a system?
75%-90% of Dead Load
What is the formula for allowable deflection for dead load and live load, and live load deflection?
DL+LL(Deflection)= L/240
LL(deflection)= L/360
What are some of the advantages of composite steel beams?
- Greater Strength and Economy
- Reduction of overall system depth
- Greater spans without increasing member sizes
What are some of the disadvantages of composite steel beams?
- The shear connectors are costly
- For short spans and light loads, it will not be economical to use composite action.
How do short and long columns fail?
Short columns fail by yielding of the material, while long columns fail by buckling.
What is the difference between an A325-N and a A325-X Bolt?
A325-N Threads are included in the shear plane. While in a 325-X threads are excluded.
A standard hole bolt connection has how much wiggle room?
1/16”
