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Hi guys. According to ASCE rules the soil should be represented as non linear springs in FEA of buried pipelines. My understanding is that uplift stiffnes includes the soil weight since it depends on how deep the pipe is installed. However, recently a geotechnical professional told me that in...

I believe /post1 works well for what you want. You should try a Do loop combined with SET and *GET commands, all of them in RSYZ,local. good luck

You have to use TIME command between load steps. Take a look on it help command since there is some limitations regarding transient analysis. Take a look also in SET command in order to garantee that you are post processing the right load step. Regards

What do you mean with "kind of linearization"? Which stress to linearize?

Hi, While specifying your modal analysis options by MODOPT command you must enter Nrmkey equal ON. MODOPT, Method, NMODE, FREQB, FREQE, PRMODE, Nrmkey, , Cekey I hoe it helps you.

Hello all! Does anybody know if it would be OK to use ASCE rules to establish spring stiffness for submerged pipelines in order to analyse VIV according to DNV F105? Thanks a lot.

Did you unselect the lines (ALLSEL command) after applying tbe force and before solve the model?

Unfortunately it is not possible.

Dear all I need to check an API 6A flange, so while verifying the bolt stress I am not sure about which area I should use. Normally ASME uses the bolt root area but I heard that by using API I should use another. Any idea? Thanks in advance.

Hello everybody! I have a parametric apdl model and the idea is to run many analysis for differents situation. The objective is to get only the maximum displacement and stresss of the system. So to optmize the analysis I need the print DMX and SMX and further I will use workbench to run many...

Hello! If you are working in millimiters you must specify the density in ton/mm^3. If you are working in meters you must specify the density in kg/m^3. I had also this problem in the past. Prepare a simple model of a beam and compare it with the analytical results and you will see that they...

Thanks denlow60. I had already have the document. What I´m looking for is an article or another kind of documentation which I can use to understand the development of the equations provided in B16.5 Nonmandatory Appendix A - METHOD USED FOR ESTABLISHING PRESSURE–TEMPERATURE RATINGS. Thank you...

Does anybody know or have any article explaining the development of B16.5 Appendix A?? Thanks.

Hello Take a look below and check if it helps you. It´s an analysis where a displacement was applied in order to represent a pretension in bolt of a flanged connection. Then a internal pressure was applied in the flange. sload,1,pl01,tiny,disp,2.5,1,1 !preload equivalent displacement...

Thanks very much marty007! A friend of mine said the same. The strange aspect about this issue is that despite ASME VIII gives requirements to determine a working pressure, and normally it´s lower than b16.5 pressure-rating, the code allows us to project a pressure vessel with b16.5 flanges...

Hello all I needed to check the possibility to increase the working pressure of a flange above the pressure-rating given by asme b16.5. The pressure rating is 15.8 bar. The demand is to work up to 18.6 bar. In order to verify the possibility I used the ASME VIII code procedures and...