For specific or detailed information you may need to talk to an ocean engineer. The base water level during a hurricane may rise (storm surge), assuming waterway is connected to the ocean. In open water, the wave height & period that is generated is a function of wind speed, wind direction & duration. Waves are modified (higher & closer together) as they approach shore and water depth decreases. You may be able to find this "design wave" information for your location, try the local officials, disaster or hazards documents.
Forces can then be estimated for a design wave height. Will depend on pile/pier diameter, primarily. The "Shore Protection manual" by the Corps of Engineers will cover all this.
M^2, I'd be interested in that Nafac publication if you find it ---- CarlB, I'll try to obtain the C of E publication on shore protection. Thanks for the tips.
Ron, I did back into the number and that's what jolted me.
This is a frame consisting of two 24" sqr prestressed piles connected at the top by a tie beam such that a full moment connection is developed there. I chose a point about ten feet below the sea bottom that would approximate the maximum moment developed in the pile and backed into the load that would be required near the top to simulate the force imparted to it by the wave action.
The result was a load that was less than 1/3 of the number that appeared on the original design drawing, leading me to question how that number was arrived at originally. In this case, "originally" means 1959.
Polecat...your original post led me to consider something besides concrete, since you indicated that it bent.
Your number might be closer than you think, since the wave action likely caused some scouring, thus fixity would be achieved at a lower depth than was perhaps considered in the original design.
Is the actual water depth the same now as when they were constructed? If so, is it possible that fixity was considered in the original design to be higher than we would currently.
Why thank you Ron. I needed a purple star for the Christmas tree!
Did you put up the palm tree this year?!
The way the weather is in the central midwest, the snow is only a figment of my imagination and so is the fact that I've walked uphill to and fro school. If I tell that story nowadays, I get strange looks and not for the obvious reason. It's all that hot-air from politicians causing midwest warming!
Regards,
Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
sent both you and carl one, earlier... well deserved and very good and timely articles... doing some work on cofferdams exposed to wave action and ice.
Sorry, but I could not find the specific Navfac publication. I do have a 100 page printout of the wave force section, but it's probably 30 years old or more.
Sounds like you have solved your problem though. Good luck.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
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