Sir, this is a great video series for a student to learn abaqus from scratch. sir you have helped students with limited resources to gain such high level of conceptual clarity
The CDP material data used in this tutorial is available for download (see link in video description) Correction @41:27 --> Selected mesh element family should be Truss instead of Beam since rebar parts were modeled using truss sections.
Dear Dr. Ahmed, what should I do if there is warning appears "OP=NEW on *CONTACT is ignored when the general contact definition is specified as model data"?
Dear Sir! I highly acknowledge your efforts regarding this informative guide. I have few questions. Would you please answer? 1) Around 14:55 (in your tutorial), under 'Concrete Damage Plasticity ; a) Under 'Concrete Compression Damage', what values you've used for 'Yield Stress' and 'Inelastic Strain' for 'Compressive Behavior'? b) Under 'Concrete Tension Damage', what values you've used for 'Yield Stress' and 'Cracking Strain' for 'Tensile Behavior'? (Actually Sir I'm following your data while modelling (a typical beam) to have an accurate sample like you because I'm a beginner in ABAQUS). 2) Why do we use reinforcement as a 'Truss type element" instead of the beam? 3) What might happen if we draw the parts randomly instead of very correct according to the reference axis as you did for stirrups? Why can't we draw them randomly and later on put/draw their exact dimensions? (In fact, my supports and reinforcement locations aren't exactly the same (after assembling them) as yours, maybe it is due to not drawing them exactly as per axis (as you did). I am waiting for your very kind response. Thanking you in anticipation.
Please check the video tutorial on the CDP material model. The used CDP material data are available to download in the description. You can used either truss or beam elements for the rebars. You can draw the parts randomly. ofCourse, doinf this with reference axis make the assembly process easier.
@@AElkady Thank you very much Sir for your very kind response. Can I please contact you/ask questions next time in case I come across any difficulty/problem in ABAQUS? Thank You.
Hello dear sir, I have made a pool contruction with almost the same steps as you have done in the video, but under Edit job --> Precision , i can't change the Abaqus/explicit precision bar to Double - analysis + package. Abaqus won't let me change it. Is it something wrong with my license, or is it a system fault in my model?
Hello Dr. Ahmed , I have watched thousand of tutorial but this one is the best to be honest and very usefull thank you ! I am modeling a Shear behavior of reinforced concrete beams with web opening near supports strengthening by prestressed strand, so do you have any similar videos that can help ? Your help is much appreciated looking forward to hear you response than you.
Dear Dr. Ahmed Elkady, all of your videos are very informative, thank you so much for preparing them. I have one quick question. Should the element type of rebars be "Truss", which is T3D2? Thank you!
Yes correct. Note although I may have mistakenly selected a beam type element, ABAQUS ignored that when the job is submitted and T3D2 was used instead.
Thank you for this detailed explanation. This was very helpful. I have a question concerning the loads. If we want to apply pressure on the top surface of the steel support instead of displacement is it possible? If yes what are the boundary conditions we have to add? (This work will help me a lot in my thesis work)
Dear Dr. Ahmed, can you tell me why I get this error: Abaqus could not locate the package_dp executable. This may indicate that this component is not installed. Please contact your system Administrator for further assistance
Hello. Thank you for your videos, they are very helpful in learning Abaqus . Tell me how to take into account your own weight when calculating reinforced concrete beams .I understand that the load is set through the force of gravity ,but what is the amplitude to take ?
I'm using a compression analytical expression described in Eurocode 2 for cdp model, would you mind proving us with the tension expression so I can use it inelastic cdp model
Thank you for the complete guidance that you provided on the procedure on modeling in Abaqus. This is what I need for my thesis project. I replicated what you did and I submitted a job on abaqus. But I am unable to get result yet. Abaqus has been trying to process the job for 1 hour now. It shows on the status “running”. Is this normal? How long does it take to complete the analysis process on Abaqus?
Good day sir, can you do a progressive collapse analysis simulation for a short span bridge? incorporating landslide debri and extreme flooding loads? thank you
Am asking for your contact details I have serious problem in Abaqus, am modelling Bamboo Scrimber material using a four point bending test. Bamboo Scrimber is a new material and how can I configure damage plasticity.
Dr Ahmed, you mentioned at time 2.01 minute to be more efficient to make use of symmetry you model half of the beam, but if assign the symmetry boundary condition to either main or transverse reinforcements, a warning of the overconstrained condition on the reinforcing bars will be shown due to the embedded constraints and the applied symmetry conditions. Is there any way to resolve this problem noting that I'm using the implicit solver method? Thank you.
A simple solution would be to create a small partition in the rebar lements near their edge. Use this partition to apply the symmetry BCs and excllude it from the embedment BCs.
thankyou professor for this amazing video tutorial 👍👍. you gave amplitude as 0-0 and 10-1 instead if we increase from 10-1 to 20-1 does the Analysis run faster
Dear Dr. Ahmed, How to solve this error "THE MATERIAL OPTIONS *CAP PLASTICITY, *CAST IRON PLASTICITY, *CLAY PLASTICITY, *CONCRETE, *CONCRETE DAMAGED PLASTICITY, *DRUCKER PRAGER, *FOAM, *CRUSHABLE FOAM, *MOHR COULOMB, *JOINTED MATERIAL, *PLASTIC AND *SOFT ROCK PLASTICITY ARE MUTUALLY EXCLUSIVE" in the ABAQUS.
@@AElkady No sir. I am using only "CONCRETE DAMAGED PLASTICITY" material model as you have done in your video. But I am getting the error "THE MATERIAL OPTIONS *CAP PLASTICITY, *CAST IRON PLASTICITY, *CLAY PLASTICITY, *CONCRETE, *CONCRETE DAMAGED PLASTICITY, *DRUCKER PRAGER, *FOAM, *CRUSHABLE FOAM, *MOHR COULOMB, *JOINTED MATERIAL, *PLASTIC AND *SOFT ROCK PLASTICITY ARE MUTUALLY EXCLUSIVE" in the ABAQUS".
Thank you sir, this video is very useful. However, is it possible to comsider the creep and shrinkage on concrete in Abaqus. If yes, could you please let us know how to do that? Thanks in advance.
Thank you again Dr. Ahmad..If we modeled half of the beam to be more efficient, what would be the constraint on the symmetrical face of the beam (mid-span)? Any suggestion?
applying symmetry in the transverse direction will be not be appropriate in that case since this pinned-roller beam is allowed to deform in the longitudinal direction (even at mid span)
Sir thank you for sharing the tutorials...Hope to see more.... Sir I have one question, Suppose I am simulating an air blast experimental test on reinforced concrete slab modelled using CDP model and Johnson cook model for steel, how can I understand the slab is failed or not. I tried to do the same but from deflection time history I understood that the maximum deflection have gone to the level of 20cm after which there is no change in deflection. But it is obvious that a slab cannot deflect that much. The time period given in step module is 0.01 and I am using explicit analysis using conwep airblast. Can you give me some suggestions?
Hello Dr. Ahmed , I have watched thousand of tutorial but this one is the best to be honest and very usefull thank you ! I am modeling a cantliver beam with prestressed tendon and reinforcement so I need to get results about long term deflection , creep and shrinkage effect , so do you have any similar videos that can help ? Your help is much appreciated looking forward to hear you response than you
Hello, would you please share your material library. In particular, I am interested in looking how you defined the combined hardening parameters for the other steel materials
42 nodes on an embedded element do not lie in any host element. Check coordinates, exterior tolerance and absolute exterior tolerance parameters, and the host element set definition. The nodes have been identified in node set ErrNodeEmbeddedNode. 994 elements have missing property definitions. The elements have been identified in element set ErrElemMissingSection. Analysis Input File Processor exited with an error.
Hello, Dr.. Ahmed Elkady. This is a great video. I learned a lot! But I have a situation in my work - I already done my modeling, steps, interaction, and all based on the sample on your video, and yet, I come up with no results in the Visualization. I only did what is told on your video.
If you are using explicit solver, make sure that the field variables are saved every time step that is smaller than the step time (Check the fied variable request).
@@AElkady Sorry for this comment. It just happen that I click the results in the UI and not in the job. Sorry Dr. for the inconvenience. So, when I click the results in the Job, that is where the results came in. Thank you for answering my querry, Dr.! You're such a lifesaver in Abaqus tutorial!!!
@@AElkady I have another concern about this tutorial, how to graph the Force vs Displacement (Midspan) for this 4-point bending test? I have watched your other tutorial here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-pymmvbp4Kz8.html where you have extracted the Force vs Disp graph from the Column Base (Reaction/Force) and the Displacement in the Beam end.
dear dr.Ahmed,thank u for ur tutorials they all very impressive and I learned about ABAQUS.my question is when ever I define concrete damage placiticity I recieve messege in job submission that `` cap placiticity,concrete damage placticity .......etc´´exclussive..why this happens? thanks, Avin
@@AElkady Thank u so much for ur reply, I solved the issue I was defining plastic and concrete damage plasticity. But now I am getting another error said "the independent variables must be arranged in ascending order. This error may have been caused by a possible empty line on the datacards in the property definition"...so I dont know where exactly I have to fix this
Thank you for sharing your video, sir. I have a question. May I know why you use dynamic explicit analysis instead of static analysis, because the 4-point loading test is a typical static test for static analysis, however, explicit analysis in ABAQUS is used for impact or other dynamic analysis related to time variables.
Thank you Dr. Ahmad, this was very helpful. at 37:10 you mentioned that having a reference point at the support and at the applied load is the recommended way and then you referred to another video. Could you please refer me to that video where you have explained this. THX
Hello sir, I tried to submit the job from your CAE file, but it was aborted and this error showed: Process terminated by external request (SIGTERM or SIGINT received). Knowing that I neither killed the job myself nor changed the power source(unplugged my PC). I googled the error, but a lot of possibilities were to consider like meshing size, increments, odb size, cutting off the internet connection, what Do you think would be the problem! Please, if you have any idea this let me know, I'm kinda in a hurry. And thank you for your precious content.👍👍
@@AElkady thank you for your reply sir, I managed to fixe that! Neverstheless, I encountered another issue, the job kept running for almost 5 days that I had to kill it myself, the output tab shows constantly frame 11 and the progress freezed at some increment number without showing any error. Is that normal sir? Taking this much of time to run a job like this one? Thank you
Dear Dr. Ahmed Elkady, Thanks a lot for your great presentation. I tried to do the same as per your instruction, However, end up with the error "994 elements have missing property definitions. The elements have been identified in element set ErrElemMissingSection. Analysis Input File Processor aborted due to these errors.difficult to find the error, as per me it is in order. please help me to find the reason for this error.
This means that some parts are missing a "section" property assignment. Make sure that you assign a section to each part. Also, make sure, that the mesh element category matches the assigned section property type.
@@AElkady Thanks a lot for your response sir. Still difficult to find the error, I checked the elements through query information, Total no of elements are as follows. The total no of elements for reinforcement including stirrups is 994. but properties have already been assigned. your kind support in this regard is highly appreciated. number of elements: 14323 11781 linear hexahedral elements of type C3D8I 994 linear line elements of type B31 1548 linear hexahedral elements of type C3D8R properties have been assigned for all elements. what is type B31 elements
@@premasirikarunarathne5893 you must sure the mesh element type matches the assigned section property type. For example, if you have assigned a truss section to the rebar, then make sure the assigned mesh element is also a truss element such as T3D2.
@@AElkady Thank you very much, sir. Abaqus automatically selects B31 type elements as the default for all reinforcement represented as truss elements in this case. B31 elements were manually adjusted as T3D2, and the error was eliminated. why Abaqus select B31 for truss by default and What's wrong with selecting B31 elements instead of T3D2.
Dr. Ahmed it is a great modeling..I would like to invite you to publish a paper together in this subject in an Elsevier journal. Dr.-Ing. Nazim Nariman
for loading step, you have many choices. For instance, you can design the displacement cyclic load protocol based on FEMA-461. Also, you can use the EC2, table 3.1 utilizing compressive stress and strain values. Meanwhile, you can subscribe to our youtube channel here to get the latest updates: ru-vid.com
Hola te saludo de Mexico estoy viendo tu video y me pareció agradable, mis comentarios; no muestras las propiedades del concreto en sus tablas de daño en compresión y tensión. Esta parte es fundamental para realizar el análisis. Es correcto que tomas los materiales de tu librería, pero para mostrar un buen video está parte faltaría en el material. Así como las propiedades del Acero en su totalidad.
abaqus needs parametric design library for structural elements. Modelling each element one by one is not practical for professional use because most of the time structural engineers have limited time for design/analysis process. I cannot imagine designing a building with abaqus.
Hello Dr Ahmed, I have questions on 4 Point bending but the beam are reinforced with CFRP bars for its tension bars. What properties shall be inserted for the CFRP material and where can i get the data? Hope you can help on this. Thank you Dr.
