6.12

Examples:6.122, 6.143, 6.146, 6.153

HW: 6.123, 6.132, 6.147, 6.155

6.9-6.11

Examples:6.75,

HW:6.76, 6.87 b), 6.88 b)

6.7-6.8

Examples: 6.44, 6.53, 6.70

HW: 6.45, 6.54, 6.72

6.1-6.6

An undergraduate Statics student Story:

http://99percentinvisible.org/episode/structural-integrity/

Citicorp Center  (later renamed Citigroup Center, now called 601 Lexington) - New York City

How Manhattan escaped tragedy

https://www.youtube.com/watch?v=TZhgTewKhTQ#t=54

Examples: 6.1, 6.4, 6.9

 

 

HW: 6.3, 6.5, 6.10

 

 

 

 

 

 

 

Review:

Sketch the following bridges and indicated load, and determine what members are in compression and what are in tension. (Note - do not solve for the forces, just think through T or C)

 

Then, check your answers using:

http://pages.jh.edu/~virtlab/bridge/truss.htm

 

This would be a great test question - solve it before you check your answers!!

 

 

 

 

Load #1:

 

 

 

example:

 

 

Load #2:  Change direction of force

 

 

 

Load #3: Change position of force

 

 

 

 

Load #4: Change direction of force

 

 

 

 

 

 New Structure:

 

Add pin and roller supports:





 

 

 

 

 Load #5: Find if members are in tension or compression.

 

 Load #6: Find if members are in tension or compression.

 

 

 

 

  Load #7: What wall supports are needed for this load?  Apply appropriate wall supports, and then find if members are in tension or compression.

 

 

   Load #8: What wall supports are needed for this load?  Apply appropriate wall supports, and then find if members are in tension or compression.