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Galloping load to gantry structure

Galloping load to gantry structure

Galloping load to gantry structure

(OP)
Hello,

Does anyone have experience in applying galloping load to cantilever gantry structure with horizontal arm that is carrying VMS?

According ASHTOO Code:
"Overhead cantilevered sign and traffic signal support structures shall be designed for galloping-induced cyclic loads by applying an equivalent static shear pressure vertically to the surface area, as viewed in normal elevation of all sign panels and/or traffic signal heads and backplates rigidly mounted to the cantilevered horizontal support. "

-Does that mean that load is calculated for horizontal wind direction and then that load is applied vertically?

Also in code there is statement:
"Galloping is typically not caused by wind applied to the support structure, but rather applied to the attachments to the horizontal cantilevered arm, such as signs and traffic signals."

-Does that mean that we only need to apply galloping load to attached elements, not main structure? This can significantly reduce load.

Thanks!
Milos

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