Thank you
In the Output Data dialog of AtenaWin, it is possible to output the internal forces for nodes only, not for IPs also?!!

Dear Mohammed, I don't know about a way to define monitor for INTERNAL forces in the ATENA-GiD user interface - how have you introduced it?

To output the internal forces for later integration in a spreadsheet, you do not need any monitors. Just output the values through the Output Data dialog of AtenaWin. In your case, it is very easy to filter the internal points you are interested in - I see 2 ways:
A. output the value for all integration points (IPs), output the reference nodel coordinates for all IPs, filter in spreadsheet based on the X (or Y or Z) reference coordinate identifying your cut plane of interest.
or
B. select the IPs in AtenaWin and export the internal forces only for the selected IPs.

Dear dobromil,

You told me:
If you need these quantities (---), you need to integrate the corresponding internal forces outside of ATENA, e.g., in a spreadsheet.

I have defined monitoring points at the relevant mesh nodes in order to get the values of the forces there to calculate the bending moments. But I have got only ''---'' instead of the values. Could you please help?

regards

Dear Dobromil,

thank you

I will send you the model per Email, Could you please have a look at it.

best regards
Mohammed

Dear Mohammed, withou seeing your model it is impossible to guess what is going on. Before anything else, I recommend to check if the meshes being compared look reasonable, above all, if the edge aspect ratio (i.e., length of the longest edge to the length of the shortest edge of an element) is under about 3:1 for volume elements.

Hello Dobromil,

I am now analysing a strip of the street layers under serviceability limit state in order to check the maximum crack width that results. The strip has dimensions of 50cm*900cm.
I have choosen different mesh sizes (25 cm, 12.5 cm, 5 cm and 1 cm).
It seems that the result depends on the mesh size in a nonsense manner.

for the 25 cm mesh size, the max. crack width is 0.16 mm
for the 15 cm mesh size, the max. crack width is 0.15 mm
for the 5 cm mesh size, the max. crack width is 0.07 mm
for the 1 cm mesh size, the max. crack width is 0.001 mm

Could you please help in identifying the problem?

best regards
Mohammed

Unusal tasks frequently require tedious work (automation is concentrated to the frequent ones). Formulas based on cracked state AND considering moments (except for the design ones simply ignoring all concrete in tension) are not common. Maybe if you post what exactly you plan to calculate, we can find some easier way, but I suspect you need the spreadsheet.

Dear Dobromil,

I have checked the formula used to calculate the crack width by hand. It is based on the analysis in the cracked state (i.e. nonlinear analysis).
It is actually not my choice. I have been asked to perform the hand calculation. I ''must'' do it this way.
I am sorry, but the method you have suggested earlier is a little bit tedious. Is there any simpler way to do that?

best regards
Mohammed

Please see the tab "Restart Calculation from Calculated Step" in teh Problem Data dialog.

Dear Dobromil,

I am analysing using the GiD software. The programs (GiD and ATENA Science) have crashed after running for two days, how can I continue the analysis from the last saved analysis step?

best regards
Mohammed

Dear Mohammed, the most common approach to ULS using nonlinear analysis is applying the design load (multiplied by a security factor) to the model (instead of checking the stresses, moments, etc. as usual for linear models). Frequently, one simply applies the nominal load level and then increases the load up to the peak and the ratio of the max. calculated load to the design nominal load is then compared to the required security factor.
If there are multiple load combinations suspected of being "the worst", the above has to be done for each of them and the worst of them decides.

Dear Dobromil,

thank you.
I bear in mind this issue. I want to have an approximate comparison.
I would like also to design the concrete layer at the ultimate limit state? Could you please help in this regards?

best regards
Mohammed

Dear Mohammed, please do not forget the formulas for hand calculations most likely (99%) have been developed for elastic models, and would not work correctly when applied to the forces and moments from the nonlinear analysis (cracked structure). Therefore, to get proper input for the formulas, I would recommend to run a separate elastic-only calculation with the same loading, or simply calculate the elastic deformations analytically, too.