yes, our buddy teddy is infamous at doing that, especially on joints and members where the steel is always has stress relief, you see, anyplace and anytime there is a steel joint, whether it is on an aplliace door, pedails mounted to a bicycle sprocket or the joints and mounting points of a 110 story office building, the worst case scenario is tested...repeatedkly tested and 10 times the maximum expected force, in this case I believe that the joints would be tested for 1 million hits of striking in duty cycles by a 727jet, all this done both in minus 50 degree chambers and 3800 degree ovens.
humidity testing, salt spray, vibration--not sure if you have ever seen shaker tables for example
dozens--hundreds of tests
the PSUSA - the Professional Shills Unlimited Society of America just lives in a state of denial, every conceivable possible scenario, scenarios far worse that a jet striking the wtc is tested for