Open steel grid bridge flooring or “bridge grating“ has been used
since the early 1900’s on bridges where dead-load reduction was a
driving factor in the design. Movable bridges such as swing bridges,
lift bridges and bascule bridges are key examples of dead-load sensitive
structures. Over the decades of use, designers have noticed that these
“bridge gratings” have a multitude of uses in non-bridge applications.
Open steel grid bridge flooring is somewhat different from a
traditional catwalk type grating in that its components interlock as
part of the assembly process. Also, the bars that run perpendicular to
the main load carrying bars (the cross bars) are not only interlocked
but they are heavy and designed to distribute the load so that more
main bars are participating. Most light-duty grating and riveted
grating are not good at distributing load in the weak direction.
There are many useful applications where a light-weight decking
that is strong and designed for handling heavy rolling loads can be of