At the time of construction, a horse and buggy was the heaviest live load that would be expected.
The Skywalk deck was designed for a 100-pound-per-square-foot live load along with code required seismic and wind forces.
Standard pipe battens are typically designed to support 15 to 30 pounds of live load per foot of length.
Truss battens are typically designed to support 25 to 50 pounds of live load per foot.
It is typical for an electric batten to support thousands of pounds of live load.
Blocks are sized based on anticipated live loads, operating speeds, line type and other factors.
Unfortunately, the live load due to occupancy is typically much greater than the design load for a roof.
As this is done the tension in the cables increases, as it does with the live load of traffic crossing the bridge.
"These old buildings," he said, "aren't designed to hold live load."
Three kinds of forces operate on any bridge: the dead load, the live load, and the dynamic load.