Bridge of Sorrows - weekly column

Lawrence Hall, HSG
Mhall46184@aol.com

Bridge of Sorrows

Last week the Ponte Morandi, a modern bridge of interstate highway proportions, collapsed in Genoa, Italy. Thirty-nine deaths are known as of this scribbling

The Ponte Morandi was only 51 years old. Built according to the latest scientific principles and to a daring design by a civilization whose architecture, manufacturing, and design have earned the world’s admiration for centuries, the bridge failed and fell.

And yet in the area around Genoa, possibly in site of the wreckage, are bridges 2,000 years old. They don’t take big trucks because they weren’t meant to do so, but they still serve. The Ponte Morandi was meant to take big trucks, and did so for something less than 2,000 years.

Someone on the science / maths continuum looks at a bridge and considers the design according to the site and the various stress loads that will be made. Dr. Science then considers the quality of the materials and the professionalism of construction.

Someone else, that guy who thinks math is unscriptural because Jesus never told us to solve for X, looks at the same bridge and exclaims, “How pretty!”

But even the science-challenged among us can look at pictures of the Ponte Morandi and perceive that something was wrong in the design. The masses of concrete appeared to have been flung out too far between supports given that concrete is a glue of minerals and very heavy, with little tensile strength, and the spindly supports were inadequate for the load. Further, there seems – seems, and only from the pictures – to have been little provision for sway in any direction and from any cause. We all remember from Mr. Johnson’s sixth-grade science class that a triangular form will support more weight than a square because in a triangle the three sides each provide the anti-sway factor for each other, whereas the corners of a square are only hinges.

Engineering is the study of, among other things, bridge-building, real bridges, not metaphorical ones. The liberal arts, quite unfashionable these days, in their turn ask us if a bridge is needed in a given place so that people and trade can transit an obstacle and contribute to the common good, or if it is a political bridge to nowhere. The liberal arts – the fuzzy studies – also remind us that bridges have been built before, and if a bridge built 2,000 years ago still functions as a bridge we might want to apply our higher order thinking skills to learn how, and then apply the abstract principles to the specific needs of our own construction.

The two supports that converge on the apex of a triangle need each other in order to work; similarly, both hemispheres of our brains also need each other in order to work.

All that is something to think about while zipping along the long, concrete spans of our own flyover bridges whose footings are in swamps and bayous.

-30-