How to fix billboards that only bear force on both ends?

⑴Can advertising signs of more than ten square meters be hung on the stress-bearing frame or steel support at the construction site? Are there any regulations that stipulate this?
If the function of hanging billboards is not considered in the original frame or base support and support timing, then this is a change of use function, and the billboards are mainly subject to wind load, and need to be corrected. The design of the frame or support can be reviewed and carried out only if it meets the requirements.

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