- 74 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' Review Quiz…' - hayden-sellers

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

### Review Quiz…

### Structural Failure load.

### Stresses: load.

### Center of Gravity load.

On a clean sheet of loose leaf paper

2. Describe the difference between a dead load and live load.

3. The weight of an African Elephant is 55 000 N. What would the mass be?

4. An apple has a mass of 180 grams. What is the weight of the apple?

5. Describe the difference between mass and weight

What materials and structures do when they fail…

What materials and structures do when they fail load.

- Snap
- Twist
- Buckle
- Bend
- Shear
how do we get theses failures?

Bend or Buckle load.

- When you compress something, it can bend or buckle under the force (ex. Pop can)
- Compression forces cause material to bend on the inside of the curve, and pull and snap on the outside of a curve

Torsion / Twist load.

- Materials of structures often shear when twisted
- Sections of a structure slide past each other and the structure cracks or breaks in two.

Shear load.

- Solid materials are never perfectly uniform, there are microscopic cracks or weaknesses
- When a solid material is compressed, the crack can enlarge or break apart.

Common Shear Example load.

- Weight of a building may compress the soil causing the soil to shear or slip sideways.

Making use of stress load.

- BUCKLE: car bumpers, grass, cardboard box flaps
- Buckle in a crash so people are not injured

- SHEAR: gear shafts, propellers in boats
- Shear pin
- Gears slip past each other

- TWIST: twisting yarn as opposed to straight fibers
- controlled twisting turns hair into braids, string into ropes, and wires in to cables

Videos load.

- Tacoma Narrows
- Bonny Brook Bridge: http://www.cbc.ca/news/canada/calgary/cp-responds-to-calgary-mayor-s-anger-over-rail-bridge-failure-1.1302523
- Leaning Tower of Pisa

Table Group Brainstorm load.

- In your table groups you are going to put your heads together and come up with as many different ways you can think of to combat stress and failure
- WAYS TO ENSURE STRUCTURES ARE SAFE, STABLE, RELIABLE…. And SAFE
- AS MANY AS POSSIBLE

Center of Gravity or Center of Mass load.

- A structures most stable point
- Where the weight is evenly dispersed and all sides are in balance

Unbalanced Structures load.

- To determine whether a structure is balanced or is likely to fall, locate its center of gravity and draw a line directly down towards the earth.
- If the arrow points to a solid foundation, the structure is stable

Download Presentation

Connecting to Server..