Statics

Question 1

What is the difference between statics and dynamics?

Answer 1

Statics: bodies at rest or forces in equilibrium; special case of mechanics where bodies are not moving

Dynamics: moving bodies, kinetics and kinematics

Question 2

What are the different support types for beams?

Answer 2

1. Free (free to move in x and y)
2. Roller (free to move in horizontal)
3. Pinned (fixed in x and y, can rotate)
4. Fixed (no movement)

Question 3

What are the types of design loads?

Answer 3

Dead Loads (DL)
- Building/roof structural weight
- Permanent gravity load

Live Loads (LL)
- occupancy and furniture
- Not permanent load

Environmental Loads
- Snow, rain, wind, seismic

Question 4

Illustrate design load paths in a structure

Answer 4

Look at slides for load path example and tributary area

Question 5

What are the three primary types of internal stresses?

Answer 5

Axial = crushing or stretching of the member

Shear = lateral “ripping” of the material

Flexural = bending of the cross section

Question 6

Identify strengths and weaknesses of construction materials

Question 7

What are the 3 types of loading conditions?

Answer 7

1. Concentrated loads (point loads) (kips)
2. Distributed Loads (kips/ft)
3. Area Distributed Load (kips/ft^2)

Question 8

What are strengths and weaknesses of concrete? (in terms of stresses)

Answer 8

• Great for compressive, bad for tensile
• Cheap but heavy
• Brittle failure

Question 9

What are strengths and weaknesses of masonry? (in terms of stresses)

Answer 9

• Good for shear, bad for flexural
• Cheap
• Lighter than concrete
• Brittle failure

Question 10

What are strengths and weaknesses of wood? (in terms of stresses)

Answer 10

• Good for all stress types
• Grain direction matters
• Brittle failure

Question 11

What are strengths and weaknesses of steel? (in terms of stresses)

Answer 11

• Great for all stresses
• Lightweight but expensive
• Ductile failure
  *rockstar for all structural materials
• can be used to reinforce concrete and masonry