Portlandjib.com
sample bridge lessons
 

      LESSON       # 1

Deck truss- load the bridge, measure the deflection, then remove load and tighten the turn-buckle (pre-stress)

and measure the difference in deflection

hangingtruss.jpg

     LESSON # 2

Through arch- clamp 1 end of the arch ribs, apply a live load and measure the movement of the other end

thruarchmodel.jpg

     LESSON  # 3

Cantilever bridge- use moment of force to find the counter weight required to prevent towers from tipping over

DSC00078.JPG

      LESSON # 4

Cable-stayed bridge-compute the Moment on the top of the tower, and then the Tension in the back stay

cablestayed.jpg