Finite Element Analysis

[civil1979]

Hello; There are a few issues I wonder about Idecad Static; In Finite Element analysis, does the [K] [M] and [C] matrices convert to the "banded" state after this solution is created? As it is known, there are plenty of zeros in these matrices and these zeros are scattered in the matrix. By reordering these matrices, these clutter can be reduced and solution time can be reduced. Also, is the "substructing" method used for building-ground interactive solution in finite element solution? The reason for asking these questions is that I am solving a 12-storey pile-based building model and the analysis time takes 15 minutes. I am attaching the analysis status for those who are interested. If the issues I mentioned above are already implemented in the program, there is nothing that can be done anyway. Finally, while modeling the structure, if idecad creates system matrices in a static background, wouldn't this shorten the solution time? Considering the project I'm working on right now. After the initial analysis, the system generates the [K ] [M] and [C] matrices once and updates only the necessary elements of these matrices for further changes. Or, those who use the Substructuring method create the matrices of each floor during modeling without analysis. Substructuring method is a very common method used in finite element analysis. Thanks to this method, finite element analysis time can be reduced. If I explain this very briefly. For a 10-storey building, there are 500 degrees of freedom on each floor and there will be a total of 5000 degrees of freedom. So [K] [M] [C] matrices would be 5000x5000 matrices. But if substructuring is used, the matrices of the 10 layers will be formed in terms of 9-fold degrees of freedom. The matrices of the 9 layers will be formed in terms of 8-fold degrees of freedom. . . The matrices of 2 layers are formed in terms of 1 layer degrees of freedom. The matrices of the 1st floor are formed in terms of the degrees of freedom of the ground floor. As a result, the system to be solved is reduced from 5000x5000 to 500x500. As a result of the analysis, the solution is applied from the bottom up by applying the opposite of what I wrote above. Are these methods used for idecad finite element analysis? Best regards 0:00 Starting the analysis. It uses 2 core processors. 0:00 Generating geometry. 0:00 Rigid diaphragms are detected. 0:01 Calculating floor weights and centroids. 0:02 Defining cantilever beams. 0:02 Building system is being created. 2:06 Regulation checks are in progress. 2:07 Strong floor control in progress 2:12 Calculating floor loads on elements. Calculating "TOWER". Calculating "FLOOR 12". Calculating "11th FLOOR". Calculating "FLOOR 10". Calculating "FLOOR 9". Calculating "FLOOR 8". Calculating the "7th FLOOR". Calculating "FLOOR 6". Calculating "FLOOR 5". Calculating "FLOOR 4". Calculating the "3rd FLOOR". Calculating "FLOOR 2". Calculating "FLOOR 1". Calculating "GROUND FLOOR". 2:44 Loading build. 2:44 Calculating element loads. 4:12 Checking for B3 irregularity. 4:12 Analysis is in progress. 4:20 Performing a modal analysis: "Modal". Number of iterations: 2 Relative change of frequency: 8.18849e-005. 18 mods wanted, 18 mods found. Mode 0: f=0.83171 T=1.20234 Mode 1: f=0.88189 T=1.13393 Mode 2: f=1.12154 T=0.89163 Mode 3: f=2.90250 T=0.34453 Mode 4: f=3.06229 T=0.32655 Mode 5: f= 4.29451 T=0.23286 Mode 6: f=5.54472 T=0.18035 Mode 7: f=6.29989 T=0.15873 Mode 8: f=8.67009 T=0.11534 Mode 9: f=9.17459 T=0.10900 Mode 10: f=10.43673 T=0.09582 Mode 11: f=12.18565 T=0.08206 Mode 12: f=13.85144 T=0.07219 Mode 13: f=14.97253 T=0.06679 Mode 14: f=15.66746 T=0.06383 Mode 15: f=16.29644 T=0.06136 Mode 16: f=19.56570 T=0.05111 Mode 17: f=19.82317 T=0.05045 6:10 Floor loads are calculated. 6:10 Calculating TOWER forces. 6:10 12. Calculating FLOOR forces. 6:10 11. Calculating FLOOR forces. 6:10 10. Calculating FLOOR forces. 6:10 Calculating 9. FLOOR forces. 6:10 8. Calculating FLOOR forces. 6:10 Calculating 7. FLOOR forces. 6:10 Calculating 6th FLOOR forces. 6:10 Calculating the 5th FLOOR forces. 6:10 Calculating 4th FLOOR forces. 6:10 Calculating 3rd FLOOR forces. 6:10 Calculating 2nd FLOOR forces. 6:10 Calculating 1st FLOOR forces. 6:10 Calculating FLOOR FLOOR forces. 6:10 Calculated loads are being applied to the system. 7:49 Doing linear static analysis. Installing "EX" is in progress. Installing "EY" is in progress. Installing "EX1" is in progress. Installing "EX2" is in progress. Installing "EY1" is in progress. Installing "EY2" is in progress. Installing "G" is in progress. Loading "Q" is in progress. 12:07 Calculating centers of mass and stiffness. 12:12 Reinforced concrete calculation is done. 12:16 Reinforced concrete is being made. 12:29 Structural irregularities are being examined. 12:29 TDY item 3.3.5 (strong colon control) is done. 12:30 TDY article 3.6.6 - The design effects of the curtains are calculated. 12:30 Design results are available. 12:30 TDY item 2.7.5 - Internal forces in the principal axis direction of the element are increased. 12:30 TDY item 3.3.6.2 - Internal forces are multiplied by 1/alpha. 12:30 TDY item 2.8.5 - The internal forces of the elements are increased. 12:30 TDY item 2.3.2.4 - With B3 irregularity, the internal forces of the element are increased. 12:30 TS500 6.3.8 - Redistribution clause is applied. 12:31 TS500 Item 6.3.10 (Minimum eccentric control) is done. 12:31 TS500 article 7.6.2.5 - Column sprain (slenderness) calculation is made. 12:31 System recalculation with augmented results. 12:45 TDY article 3.4.1.2 - Normal force control is performed on beams. 12:45 TDY article 3.4.3.1 (minimum a and b checks of beam reinforcements in columns) is done. 12:46 TS500 item 11.2 - Floor dimension checks are carried out. 12:48 TS500 item 13.2 - Deflection control is performed on the beams. 12:48 Static analysis is performed with constant loads for deflection control. 12:48 Fundamental analysis is being done. 13:13 Static analysis is performed with live loads for deflection control. 13:33 TS500 article 13.3.2 - Checking for cracks in beams is done. 13:33 Fundamental analysis finished. 13:33 Slab analysis. 13:33 "TOWER" flooring analysis is being done. 13:34 "FLOOR 6" flooring analysis is in progress. 13:34 TS500 item 13.2 (Floor deflection control) is being done: TOWER 13:35 "12th FLOOR" floor analysis is being done. 13:48 TS500 item 13.2 (Floor deflection control) is being done: 12th FLOOR 13:48 "11th FLOOR" floor analysis is being done. 13:49 TS500 item 13.2 (Floor deflection control) is being done: 6th FLOOR 13:49 "5th FLOOR" floor analysis is being done. 13:59 TS500 item 13.2 (Floor deflection control) is being done: 11. FLOOR 13:59 "10th FLOOR" flooring analysis is being done. 14:00 TS500 item 13.2 (Floor deflection control) is being done: 5th FLOOR 14:01 "4th FLOOR" floor analysis is being done. 14:09 TS500 item 13.2 (Floor deflection control) is being done: 10th FLOOR 14:09 "9th FLOOR" flooring analysis is being done. 14:13 TS500 item 13.2 (Floor deflection control) is being done: 4th FLOOR 14:13 "3rd FLOOR" floor analysis is being done. 14:23 TS500 item 13.2 (Floor deflection control) is being done: 3rd FLOOR 14:23 "2nd FLOOR" flooring analysis is being done. 14:24 TS500 item 13.2 (Floor deflection control) is being done: 9th FLOOR 14:24 "8th FLOOR" floor analysis is being done. 14:33 TS500 item 13.2 (Floor deflection control) is being done: 2nd FLOOR 14:33 "1st FLOOR" floor analysis is being done. 14:35 TS500 item 13.2 (Floor deflection control) is being done: 8th FLOOR 14:35 "7th FLOOR" floor analysis is being done. 14:49 TS500 item 13.2 (Floor deflection control) is being done: 1. FLOOR 14:49 "GROUND FLOOR" slab analysis is being done. 14:52 TS500 item 13.2 (Floor deflection control) is carried out: 7. FLOOR 14:59 TS500 item 13.2 (Floor deflection control) is carried out: GROUND FLOOR 14:59 TS500 item 8.3.1 - Stapling controls are carried out. 15:02 Analysis completed.

 

[admin]

Mr civil1979 is used for a total of 4.5 minutes of system solution within the total analysis time you mentioned. (2 min modal analysis, 2.5 min static analysis). The remaining time is spent for the calculation of slab loads, the finite element solution of each slab and calculation of reactions, earthquake code checks, slab analysis, foundation analysis and other secondary calculations. Therefore, even if we reduce the system analysis time to zero with a miraculous method, your analysis, which takes 15 minutes as it stands, will decrease to 10 minutes at the most. As a solution, you can do the slab analysis not every time you design the system, but do it last. As for the answer to your questions, matrices are used as band matrices. The substructuring method you mentioned is not used.

 

[2m proje]

Hello there; Dear civil1979, we also use the other two programs you mentioned, but there are a few points you missed when comparing the analysis times, as follows: - While one of these programs says that the structure provides a basic interactive solution (piles are not included in this interactive solution), the other does not even make such a claim. - These programs still do slab analysis using the break lines method. - In one of these programs, it takes only 10-15 minutes to create and analyze the plate raft model, and it will take 3-5 minutes depending on your performance in punching verification. - Both of these programs do not do the analysis in one go, but in parts (from slab continuities to ductile structure controls), so when you say analysis+reinforced concrete, as in idestatics, they do not do everything. - Again, one of these programs does not even make the selection of reinforcement in the elements... It is possible to extend these items further, I think that they should be taken into account when making comparisons. I also know that ide officials will definitely take your suggestions and criticisms into consideration. Best regards.

 

[saridurmus]

Friends, I analyzed a total of 18-storey project in the form of 3 blocks with two dilatations on the basement and the ground floor, and two towers on the other 16 normal floors. only 13 min. it took. The forum would be helpful if we were to make constructive criticism to the program, not as if we were behind other programs, but to add the following. thanks.

 

[civil1979]

Mr. Saridurmus; If you re-read the message I wrote, I did not mention anything like we are behind other programs or we are ahead. Also, if I were to make a destructive criticism, I wouldn't stop and explain the method I suggested to be added to the program. If you look at the messages I have sent before in the forum search section, you will see that I have no such intention. But unfortunately, I was perceived as making destructive criticism by everyone. If I have created such an impression without realizing it, I apologize to you. Thanks;

 

[saridurmus]

Mr. Civil 1979, your statement is a bit harsh. When you look from the outside, it seems like you are using another program rather than the idecad user, making comparisons with ide. Otherwise, your suggestions are good, but it seems to me that you have a belief that the friends in the forum will have every request, I apologize if I misunderstood.

 

[admin]

Every message written by our users on the ideCAD support forum is read by both the programming team and the ideYAPI management, requests are evaluated and added to the program in a certain planning according to priority and importance. The primary purpose of bringing the Forum to life is to follow your requests and needs closely and to guide the development of the program. Please continue to share your constructive criticism.

 

[mhanifiata]

Mr. Sarıdurmuş: If you re-read the message I wrote, I did not mention that we are behind or ahead of other programs. Also, if I were to make a destructive criticism, I would not stop and explain the method I suggested to be added to the program. If you look at it, you will see that I had no such intention. But unfortunately I was perceived as making a destructive criticism by everyone. I apologize to you if I created such an impression without realizing it. Thank you;

I would like you to provide some more detailed information. As far as I know, ideYAPI also uses a solution abbreviation method in this regard. In other words, there is an elimination method that removes the zero elements from the solution. Maybe authorized friends will write something here. Technical infrastructure is not a subject that we, who are end users, actually touch on. our ability to design what with the program in the final analysis we are looking at it. it's natural. because our purpose of purchasing the program is clear. therefore, requests/suggestions/criticisms are more result-oriented. however, people like us who saw the first versions of the idea are really excited at the point reached. thanks.