Centenarian Bridges
The requirements for the bridge being designed by the Senior Design team I am mentoring include a design life of one hundred years. My initial reaction was that it is unrealistic to design a bridge today to last one hundred years. After all, how many bridges built before 1920 are still in existence? With a little reflection, I answered my own question — quite a few! One website, “Bridgehunter.com”, lists at least eighty-seven in Allegheny County, including three reported to be even older than the Smithfield Street Bridge, which was built in 1883. Let’s begin our search for centenarians…