Adding wave accelerations

[Anonymous]

We have a module that is being shipped to a offshore plattform.
How do we correctely add the wave accelerations to it, should we use the tool "Body Weight"? 

The accelerations is:

Front: 0,5 g (+ 0,0014 g per meter)

Side: 0,32 g (+ 0,009 g per meter)

Heave: 0,2 (+ 0 per meter)

Thanks in advance. 

[Pawel.Pulak]

Yes, inertia forces resulting from accelerations can be modelled using "Body forces" (accelerations in translation) and "Centrifugal and angular accelerations forces" (accelerations in rotation).

What is not clear for me in your post is "g per meter". Is it some gradient of acceleration in some direction?? Or something else?

Regards,

[Anonymous]

The accelerations increases per meter in in z-direction on the module. So 10 meters up on the module the accelerations is:

0,5 + 0,014 * 10 = 0,64 g

Is it anyway to make the accelerations increase like that.

One thing more also under "Load Types" + "Nature: Live" how do one define the "Subnature: Categorie" ranging from A-H 

[Pawel.Pulak · Accepted solution]

"The accelerations increases per meter in in z-direction on the module. So 10 meters up on the module the accelerations is:

0,5 + 0,014 * 10 = 0,64 g

 Is it anyway to make the accelerations increase like that."

It seems like approximative way of considering centrifugal effects. In such case in Robot you can directly use centrifugal accelerations - it is only necessary to find the values of centrifugal velocity and position of the center of rotation to result in such values of acceleration and gradient of acceleration.

"One thing more also under "Load Types" + "Nature: Live" how do one define the "Subnature: Categorie" ranging from A-H"

Such subnatures already exist in Eurocode automatic combinations - see the attached screen capture.

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Regards,