Energy absorption of seismic isolator mounts
Energy absorption of seismic isolator mounts
(OP)
I am looking for information on how to calculate the energy abosorbed by a rubber or other elasitic seisimic isolator based on durometer hardness, mass of the elastic material applied loads etc.
Thanks in advance
DPA
Thanks in advance
DPA





RE: Energy absorption of seismic isolator mounts
As far as how to theroetically calculate this I have no Idea.
nick
RE: Energy absorption of seismic isolator mounts
DPA
RE: Energy absorption of seismic isolator mounts
RE: Energy absorption of seismic isolator mounts
Thanks for the response. No pun etc. I am working on the design of a dock float which is attached to one end of a 2500 pound steel ramp. The float is exposed to some fairly heavy wave action. A storm this winter tore the original float loose and put some dramatic bends into the connecting bolts. I would like to absorb as much energy as possible in order to protect the connections as well as any boat that might happen to be left there during a storm.
DPA
RE: Energy absorption of seismic isolator mounts
So you have a different design challenge than I'd thought, and the approach to it would require a lot more input than can be provided here. Maybe you should look at Gent's book on Engineering with Rubber (available from the Rubber Division of the American Chemical Society). Your other avenue is to find a competent consultant, preferably an engineer who really knows rubber or a rubber technologist who really knows engineering. (Neither group is very large!)
RJD
RE: Energy absorption of seismic isolator mounts
Thanks for the tips. I'll look around. I guess I could always go to steel springs as a last resort. Lots more people understand those than rubber including me. Weight is a problem though not to mention arrangement.
DPA
RE: Energy absorption of seismic isolator mounts
R J Del Vecchio
Technical Consulting Services
(consultant in Applied Rubber Technology)
RE: Energy absorption of seismic isolator mounts
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"
RE: Energy absorption of seismic isolator mounts
That is a very helpful tip.
Focht3,
This is just a private dock on a lake in Washington State but the guy's property just happens to be situated such that the wind and waves come crashing directly at him. There is a solid sandstone bottom that goes out 72 feet from his retaining wall where the water depth varies from about 6 feet at the deepest part down to almost zero (at the deepest part) depending on the time of year. The sandstone ends abruptly in an almost sheer cliff that appears to drop off to several hundred feet. I went down to 85 feet looking for a lost piece of lead ballast and it was still dropping off at about an almost vertical down angle. The float is out over the deep part. In addition the cliff does not stick out as far on the neighboring property so his part of the cliff area is fully exposed to wind and wave action. If we had had experience with the weather a that location we would not have taken on this job for any price although the guy is willing to pay whatever it costs.
DPA
RE: Energy absorption of seismic isolator mounts
Of course, you could install anchors at depth - but that isn't too practical because of the steep bottom slope.
You've got a tiger by the tail!
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"
RE: Energy absorption of seismic isolator mounts
DPA
RE: Energy absorption of seismic isolator mounts
Is this the owner's permanent residence - or a weekend retreat? How much warning does he have about drops in the water level (lake) or is this a tidal issue (Pacific Ocean)? What does he do with his boat(s)?
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"
RE: Energy absorption of seismic isolator mounts
DPA
RE: Energy absorption of seismic isolator mounts
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"
RE: Energy absorption of seismic isolator mounts
DPA
RE: Energy absorption of seismic isolator mounts
Basically, you will have to put the photos on a publically accessible web site and create links to them in your message. It isn't hard, but it can be tough getting the images the right size. Don't make the images any wider than about 600 pixels - for 1024 x 768 screens. You will have to play with it to get it right.
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora. See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"
RE: Energy absorption of seismic isolator mounts
Are you asking the ramp to locate and restrain the float?