For the truss design project we had to make 3 different trusses. Two were already designed and one we had to design on our own. We then tested them to see how much force they could handle.
Sketches of truss 1 and 2. failure is at glued corners
Efficiency of truss one is 9.333. 14N/1.5g
Efficiency of truss two is 5. 10F/2g
Efficiency of truss two is 5. 10F/2g
Logger pro graphs
Constraints for our own truss were we only had one full piece of wood to use. It also had to have a base of at least 3in.
Bellow is a video of truss one testing, then truss two testing, and then our custom truss testing.
Truss one is statically determinate, truss two is not.
Decision Matrix
strength material used total
choice 1 1 3 4
choice 2 2 3 5 higher number is better
choice 3 3 1 4
choice 1 1 3 4
choice 2 2 3 5 higher number is better
choice 3 3 1 4
It failed in the middle of each joint. They broke into pieces. I think it did this because the glued area was stronger then the actual wood.
If i redid this truss i would add two more joints to make an x on each side to take some force off of the two outside joints.
If i redid this truss i would add two more joints to make an x on each side to take some force off of the two outside joints.