Hello,

I am trying to establish a user wind profile and I have a couple of questions.

1) When I got the same pressure for the whole model, then in the pressure vs elevation matrix I can put a “random” value in the elevation field?
2) For multiple pressure values, the elevation field defines the “from” or “up to” value?
3) When part of the model from a certain elevation is not subjected to wind pressure, then I have to define it on the user wind profile or just turn off the wind shape factor?

Thanks in advance

1. This profile (wind pressure vs elevation or wind velocity vs elevation) is made based on Site information. You can't put any random number. The pressure in the system has nothing to this wind pressure. Its actually a form of Pressure head in Wind profile.
2. Its the value of wind pressure/velocity at the elevation concerned.This helps to interpolate the values at other elevations in the piping model.
3.Simply turn Wind OFF!

Hope these helps.

Thank you for your answer, but I am afraid that i didn't myself clear.

1) I just want to verify that with just one pressure, no matter what elevation I put in the pressure vs elevation matrix, i get the same results.
2) lets say that for the first 5 meters above ground I have 0 KPa of pressure, for the next 5 meters 10Kpa and then for the last 5 meters 20Kpa
The correct input to the press vs ele should be


0 Kpa 0 m
10 Kpa 5 m
20 Kpa 10 m

or

0 Kpa 5 m
10 Kpa 10 m
20 Kpa 15 m

I want a clarification on this, as I could not find this information ion Caesar manuals

Thanks once again.

0 kPa - 5m (means upto 5 m, there is no wind pressure)

10 kPa - 10m (means b/w 5-10 m , the wind pressure is 10kPa)

20 kPa - 15m (means b/w 10-15 m , the wind pressure is 20kPa)

Hope its clear now.

Do remember to check the elevation in isos. Sometimes, the FGL/HPL is not Zero.So, modify your wind profile accordingly or you may be putting upto too excessive or too low wind in your analysis!!!

Thanks once again for your reply.

So in my case, I have a model starting at 10m and ending at 19.5m. I modified the global coordinates accordingly.

I should expect that when applying the following four sets I should get the same results.

1) 20KPa 20m

2) 0KPa 5m
20KPa 20m

3) 0KPa 9m
20KPa 20m

4) 0KPa 5m
20KPa 50m

In fact in all of these cases, I get different results. Most probably the first set is the correct one but why? Can somebody enlighten this for me?

So , anyone having a comment on that?

How can you get same results in all these different wind profiles!!!!

If I understood it correctly, then in one case you consider wind of 20kPa till 20 m whereas in last you considered it upto 50 m? The wind profile will be interpolated for the intermediate elevations based on these data.

I'm wondering what exactly you want to do?

Dear Sir

In CeasarII 2013 R1 version 6.10.00.0028, In the CAESAR II model , some times, elements got disabled. I am able to see and review the system and i am not able to click the element .But i am able click the restraint sysmbols.

It was working initially and suddenly it got disabed.

Can you any on share with me what could be the possiblity??

Sha...

In all the above mentioned sets, the area where my model is included (from 10m to 15m ) is subjected to 20Mpa of pressure.

I am using user wind profile in order to model blast load scenarios. In a simple model I may have several areas of different drag pressure. By running this simplified calculations that I mentioned above, what I really trying to do is to make sure that I understand how the user wind profile works and that I am getting the correct results.

I would like to mention that up to now I wasn't able to find something in Caesars manual, that s why I am posting this here.

So , back to my question. As long as my model in all 4 sets is in the "20Kpa area" why i dont get the same results?

Thank you in advance for your time

Can you post your model?Its difficult to interpret from what you say.

In the meanwhile, say for example you want to calculate wind pressure at an elevation of 14m.

Going by your wind profiles, for 14m the wind pressure (interpolated)for

- 1 profile --- can't be interpolated as there is only one set of values.

- 2 profile---- 12 kPa

- 3 profile----9.09 kPa

- 4 profile----4 kPa

Since, the wind pressures are different for the same elevation(14m) using your different wind profiles so will be the stresses & loads!!Which means that the profiles are different & not same !!!!!

But still if its not clear, then post your caesar file!!

Ok, you said the magic world. thanks for the help

KYR

Sometimes, we miss trivial things!!!



I do remember the childhood story of how Issac Newtom made a new small hole in his door so that the new born kitten can pass through it as well as the mother cat!!!