This section lets you apply the weight to a structure and see how good it really is. This is the tester, but we prefer to call by the imperative phrase, "BUST IT!". Our applet will show you how the force is distributed through the structure. This will show you which beams have to hold a lot, and which beams don't. Different designs will distribute the force differently. This is the heart of our site, the idea being that you can experiment, finally finding a design that fits your criteria and also works well.
For instructions, see the Quick Start.
Like with the The Builder/Construction Zone, this applet requires Java. It is your duty as a good net citizen to have the latest technlogy in web browsers. If you don't have one, please get one. Also check out the Full Walkthrough to learn the mathematical aspects of what makes a bridge stand and our applets tick.