Scioly.org

Has anyone used any good iPad/iPhone iOS apps that will (at a basic level) allow you to input a bridge design and then do some stress testing? It's ok if it costs some money.

Here's a link to a website that lets the user make different designs and apply loads. It's not a tablet app, but it gets the job done.

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

Model smart 3D is a very good program, but takes a while to master it.
They used to have a student price.

There are also these: https://bridgecontest.org/resources/pre ... -software/

Formerly called the West Point Bridge Designer, I've worked with some of the older versions. Not an app (download on Windows or Mac) but pretty cool to play around with.