Trivia Tuesday, April 14

Last week's answer

Question: Open steel grid decking (or "grating") is a common sight on movable spans and older trusses. While the humming sound it creates is famous, what is the primary structural reason engineers specify an open grid over a traditional reinforced concrete deck?

Answer: To reduce the "dead load" of the superstructure and eliminate the need for complex deck drainage systems.

An open grid deck is described as the lightest and most economical grid deck option. It is most suitable for bridges with low-traffic or rehabilitation projects where reducing dead load is necessary. The open design makes it optimal for drainage and natural snow-shedding, resulting in reduced maintenance needs and extending a bridge's service life in colder climates. 

Source: Mission Critical Solutions