These first two images are "mode shapes." In other words, this shows the way that the bridge would vibrate. The natural frequency of the bridge is about 0.5 hertz. Pedestrian bridges with a natural frequency less than 3 hertz can have problems with pedestrian induced vibrations (bridge can start to wobble, the people feel uncomfortable and freak out). This is bad news and means that our bridge needs to be made more stiff. However, we don't necessarily need to resolve this during the competition.
The next two pictures show how the bridge deals with temperature change. I thought that our bridge would be flexible enough to handle the temperature changes without joints. However, the thermal stresses are off the chart. This is bad news and we will need to put some joints in somewhere.
1 comment:
Awesome thanks Scott. Well the results arent so awesome but whatever. Looks like we've got some things to go over tomorrow.
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