Hi all, I have these warning messages after performing the Spectral Fatigue Post Processing. I don't really understand why these warnings occur. Can anyone provide any advice on how to solve these warnings? Thanks
Note, I am using SACS version …
Hi,
I would like to perform time history fatigue analysis. Is there any sample or procedure on how to perform the analysis in SACS? in case yes, please feel free to send it to my email. ( ali_aidibi_94@hotmail.com )
Many thanks in advance.
Best…
Hi
I am working on fatigue analysis of jacket structures. As per the SACS doement as below
"3.5.4 Using Stresses at the Chord Face By default, member hot spot stresses at the modeled end of the brace are used for fatigue calculations. For members…
Hello
I am doing pile fatigue check based on pil.csf file (obtained from PSI analysis).
Pile is defined as concentric tubular section so that grout is done in between the tubular.
in FTOPT line grouted memeber option is selected and in FTOPT2 ,colum…
I have scatter diagram with total number of occurrences 175320 waves. It is indicated a note that these records are " Hourly event number of occurrence - reference period: 20
years". My question, what does this note mean? should we multiply the scatter…
Hi Users,
I am getting the following error when I run the spectral fatigue analysis file:
SEASTATE FILE 1 HAS 60 LOAD CASES WHERE POSTFILE 1 HAS 1440 LOAD CASES
Can anyone explain this error and what must have gone wrong?
Hi everyone,
I would like to inquire what is the significance of mesh intensity in joint meshing. In the Utilities manual, section 3.2.3, the following highlighted statements are made (see screenshot below):
Which lead to these questions:
What…
hi all ,
while generating the seastates (dynamic transfer function) on a cantilever inside the water it was noticed that there is bulb at the early frequency. any ideas why this happens
and thanks
Hi there.
I need to perform Fatigue analysis for sea transportation in order to understand this calculation I started studying this guide "Tow Fatigue with SACS".
I ran into a problem, if I understood correctly this formulas => have to calculate these…
Hi,
When we run RAO spectral fatigue we have warning message like below. What is the cause and consequence of this warning?
We didn't have this warning before when we had 16 headings (22.5 deg increment) in RAO and 16 wave scatters in ftginp.
Scatters…
Dear all
I'm working on a spectral analysis for a leg member.
An I extract the nominal stress range and cycle counting for a member, say, by using St-cyl-command ?
the reason is that, the member has weld detail joints which can't be checked within…
Hello everyone,
Could you please clarify the significance of the resulting RMS value when we run the spectral fatigue analysis?
RMS value = Sqrt(m0) or RMS = 2 Sqrt(m0) ???
Thanks!
Hai,
I have run the analysis for Spectral wind fatigue. But there are error occur during analysis.
This is my dynamic response input file
Can someone help me on this.
Dear all,
I am trying to use Center of Damage Utility for calculate COD wave height and time period.
In the fatigue input file, I could only input 11 wave heights in SCWAV card.
Can anyone explain how to input more than 11 wave heights in wave scatter…
I'm Mr.Gong who works at Zentech Engineering in Seoul, South Korea.
We would like to do Fatigue and Strength Check using the SACS Wind turbine module from GH-Bladed results.
While browsing the example, I found an example of the following link:
https…
Dear Sir,
I am curious about SCF calculation for tubular connection with ring stiffeners.
It is mentioned that Smedley and Fisher (1991) formula is applied.
The R-factor calculated by using the formula mentioned above looks ok.
However, the final…
Dear Sir,
I'm running a spectral fatigue analysis for a platform with grouted legs. These are my section input for my joint cans at leg
SECT LEGCAN TUB 111.765.08091.4403.810
SECT LEGCAN1 TUB 111.765.50091.4403.810
SECT LEGCAN2 TUB 111.766.00091…
Hi,
I try to conduct fatigue analysis by using SACS.
With very useful answer in the communities, fatigue analysis was successful. However, I also want to conduct a fatigue experiment for some members based on results from fatigue analysis by SACS…
Anupam,
Let's first look at the input requirements for a tow fatigue analysis:
Fatigue Input File (ftginp)
Common Solution File (saccsf)
Seastate Input File or Tow Input File (towinp)
The fatigue input file defines the fatigue cases which…
C.karthikeyan,
You can specify SCF overrides in a variety of ways in your fatigue input file, the most common being the SCF line and the CONSWF for plate girders. The SCF line can be used to override SCF's for all plate girder connections whereas the…
Stephen,
You need to do a Tow Fatigue analysis. Tow Fatigue will analyze fatigue damage of a structure by generating transfer functions using motion RAO's (Velocity, Motion or Acceleration RAO's) and combining those transfer functions with the wave…
Sanjay,
That is not how the wave spreading works in SACS. When you select the wave spreading option, SACS will take the load cases from +- 90 degrees from the fatigue load case direction and factor those load cases using cos^n(theta) so that total equivalent…
Kasiphon,
The nonlinear drag component in spectral wave fatigue analyses is addressed by using constant steepness waves when generating transfer functions. See Section 16.7.2.3 of ISO 19902.
Regards,
Geoff