MOORING DOLPHIN
MOORING DOLPHIN
(OP)
Dear Colleges:
In order to evaluate an admissible lateral load, according to your experience, what could be an allowable lateral displacement for the pile head of a mooring dolphin?. In my case I have 20 m depth of water.
Thanks for your comments.
In order to evaluate an admissible lateral load, according to your experience, what could be an allowable lateral displacement for the pile head of a mooring dolphin?. In my case I have 20 m depth of water.
Thanks for your comments.





RE: MOORING DOLPHIN
RE: MOORING DOLPHIN
The design of your dolphin depends on the size of the ship , soil resistance profile and water depth. 20 m of water depth is quite high and will influence a lot on the design
RE: MOORING DOLPHIN
Well, this is really a big lateral displacement. I was expecting a shorter value. Let me tell you, I am using the AllPile program and evaluating the behavior of 56 and 60” Ø steel open pipes for a mooring dolphin.
I read this from R. L. Mokwa and I quote “…Pile Displacement: Group efficiency is independent of pile displacement; however, it appears that Ge first decreases as displacement increases, and then becomes constant at deflections in excess of 0.05D (5 % of the pile diameter). The small variations in Ge at deflections greater than 0.05D fall within the typical range of experimental data scatter, and are insignificant with respect to practical design considerations.”
According to this I suppose that maybe to limit the lateral displacement of no more than 5% of the pile diameter could be a good value. What do you think?
RE: MOORING DOLPHIN
RE: MOORING DOLPHIN
We have two types of dolphins : mooring and accosting. For accosting dolphins you need a lot of flexibility to absorb the shock of the ship. For commercial ships you have generally movements of 70 cm when the ship is accosting with dolphins which are 1.4 m diameter and 30 mm WT at the top. You need this flexibility if you don't want to damage the boat. Part of the total displacement is taken by the rubber defense and part by the pile itself.
For mooring dolphins all the displacement is taken by the pile.
5% of pile diameter seems very little to me unless you are talking about leisure boats of small size.
RE: MOORING DOLPHIN
Save the dolphins...
RE: MOORING DOLPHIN
RE: MOORING DOLPHIN
designed to withstand the impact of berthing. In my case, the mooring platform is designed to behave in a rigid manner, where the structure consists of a concrete deck (cap) supported by vertical steel piles. In this structure is where I want to estimate an admissible horizontal displacement of the pile fixed head.
And yes csd72, save de dolphins!.