Vibration Assessment of a Structure
Vibration Assessment of a Structure
(OP)
Hey all,
A client of mine is going to have sheet piles placed close to (200' to 300' away from) his commercial structure. He wants a vibration assessment done on the structure. I have a fairly recent (3 years old) geotechnical report of the site soil conditions. In your opinion, should anything else go into consideration besides age of structure, type of structure, and overall general condition. Also, how would those weigh into "factoring" the typical peak particle velocity in this area (typical peak particle velocities in this area are usually assumed to be 0.04 in/sec for blasting/short impact and 0.2 in/sec for vibratory/hydraulic hammer type operations)?
Thanks in advance.
A client of mine is going to have sheet piles placed close to (200' to 300' away from) his commercial structure. He wants a vibration assessment done on the structure. I have a fairly recent (3 years old) geotechnical report of the site soil conditions. In your opinion, should anything else go into consideration besides age of structure, type of structure, and overall general condition. Also, how would those weigh into "factoring" the typical peak particle velocity in this area (typical peak particle velocities in this area are usually assumed to be 0.04 in/sec for blasting/short impact and 0.2 in/sec for vibratory/hydraulic hammer type operations)?
Thanks in advance.






RE: Vibration Assessment of a Structure
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Vibration Assessment of a Structure
RE: Vibration Assessment of a Structure
Set triggers for the monitoring conservatively so that the structure does not feel critical vibrations. If the triggers are reached, stop the activities immediately.
Monitoring during the installation of sheet piling or other vibration inducement is necessary and should not be ignored. If your client elects to forego monitoring, either you back out of the job or you get a clear disclaimer of responsibility and a clear indemnification of damage.
RE: Vibration Assessment of a Structure
So would you say a continuous run over, say, a week during operations with the trigger set at 0.1 in/sec would be sufficient, or overkill?
RE: Vibration Assessment of a Structure
Make sure that when you monitor, you are at the closest point to the structure with the operations. Monitor both the ground and the structure.
If there are any existing cracks in the structure, be sure to set crack monitoring devices as well.
Do a very details pre-construction survey of the structure and record with video and still photos. Highlight existing cracks with a lumber pencil before photographing and clearly find the end of the crack and mark it so that progression can be measured.
Good luck.
RE: Vibration Assessment of a Structure
Sebastian