Пікірлер

• 
  @Bistaolee4 күн бұрын

  Thank you for this vidéo i have à question which curve we can plot in this simulation exept force-displacement ????

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  @domingochangk99878 күн бұрын

  is there videos works of ultra-high performance concrete beams prestressed with external CFRP tendons please? I need it.

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  @vandangtran64547 күн бұрын

  Hi, the concrete i used in the model is a normal concrete.

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  @domingochangk99878 күн бұрын

  Thank

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  @israelcrawford8734Ай бұрын

  Hello Sir, Would this method work for a parabolic shaped tendon?

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  @structurelearninghub33402 ай бұрын

  Why didnt you use zero thickness interface element to simulate this

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  @vandangtran64542 ай бұрын

  Hello, this is the simplest

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  @structurelearninghub33402 ай бұрын

  How to connect rebar modelled as Beam element to solid concrete with tie constraint?

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  @vandangtran64542 ай бұрын

  Hello, in my model, I used the "truss" type element for the bars, since the bars are modeled with the "wire" type. after that, I imagine that you want to model the bar as a 3D element. It's more logical in the case where the mixed concrete beam has a steel section inside. Regards!

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  @bingbung96872 ай бұрын

  I’m trying to assign transversely isotopic material properties to a meniscus in an axisymmetric model. How could I do this?

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  @chinmayverma86922 ай бұрын

  Thank You Sir🙏

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  @chinmayverma86922 ай бұрын

  First of all thank you sir making this video, I'm a student of Civil Engineering in India. Sir can you make a video about how did you draw this Steel Barrier? that is the most crucial part and what should be the mesh size of the element?

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  @vandangtran64542 ай бұрын

  Hello, for this model, I just drew crossed lines in autocad and imported them into abaqus. I know that we can draw 3D wires with a more realistic configuration. You can try it. I don't remember what size I used for the mesh, but you can try with a 0.1 m. It all depends on the size of your model. Regards.

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  @chinmayverma86922 ай бұрын

  thank you sir

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  @structurelearninghub33403 ай бұрын

  If you are using cyclic loading then problem will be dynamic implicit, correct me if i am wrong?

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  @henrimonette53994 ай бұрын

  Thank you for this very informative video. I myself am modeling bolted connections in glulam elements. I am trying to use cohesive behavior to capture mode I and mode II cracking. I was wondering, how would you suggest calculating the Knn, Kss, and Ktt? My first thought was to use the elastic modulus of wood perpendicular to the grain and shear modulus in the corresponding direction, respectively. Would that be appropriate? If not, how do you suggest calculating these parameters? Thanks a lot for your time!

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  @vandangtran64542 ай бұрын

  Hello, What I did was to carry out mode I and mode II cracking tests, then simulated these tests in Abaqus, compare the results of the model with the experiment, vary the values of the traction-separation model (K, sigma, final displacement) until the comparison was consistent, and obtain these values.

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  @edsonrodrigues31475 ай бұрын

  Thanks for the videos! Could you share how you defined your steps?

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  @nguyenvanhieu90055 ай бұрын

  A cho em hỏi a dùng phần mềm gì để mô phỏng thế ạ

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  @vandangtran64542 ай бұрын

  Đây là phần mềm Abaqus em ah

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  @minhajulbariprince89776 ай бұрын

  3:17 Hello, Dr. Can I know why you use the concrete surface hole as the master and the rebar surface as the slave? Isn't the rebar surface more rigid than the concrete surface? In that case, isn't the rebar surface supposed to be the master? I might be wrong; can you please clear up my confusion?

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  @vandangtran64545 ай бұрын

  Hello, you're right. In some cases, you need to define a particular surface, like a slave surface or a master surface. Particularly, the calculations present a problem of divergence. But I don't think there's any difference in the results for my model, because the master and slave surfaces are the same type and the same size, and they only slide, not penetrate. You can test and tell me the results if you like. Thank you for your comment! BR.

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  @erfanroghani52736 ай бұрын

  it's very good that you mentioned the article in the video thanks.

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  @vandangtran64542 ай бұрын

  You're welcome

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  @domingochangk99876 ай бұрын

  Very interesting work and helpful. I have to need external CFRP tendons are anchored at the two end of the specimen and pitted with deviators at mid-span

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  @vandangtran64546 ай бұрын

  Hello, this video, has been on my list, in the link below may help you: kzread.info/dash/bejne/f39npZZsfJfJdrA.html

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  @brwasaeed64777 ай бұрын

  How did you apply prestressing to strand? I didn't see it

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  @vandangtran64542 ай бұрын

  Hello, I've shown first the case where the bar is not prestressed, and then the prestress, so you can see at 35:37

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  @costigohgpmvula96267 ай бұрын

  Hello Dr., is it possible to have a complete tutorial? I would like to model a pullout test to evaluate the bond strength using two different concrete strengths. How did you centrally embed the rebar?

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  @vandangtran64547 ай бұрын

  Hello, the abaqus model has been shared on my chanel (community). Best regards

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  @ZFR.098 ай бұрын

  Hello, I see that you haven't made a lateral contact (penalty + hard contact) between the element.

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  @jordankemguimatio51098 ай бұрын

  Hello sir, why don‘t you select anisotropie in the Material properties rather than engineering constant ?

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  @mehmetcizer9 ай бұрын

  hi, how the plastic properties of wood are described in abaqus, Can you help or guide me on this? I can't find data or an example, I can't test it, I need to analyze in abaqus.

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  @vandangtran64549 ай бұрын

  Hi, there is no specific model for wood in Abaqus. However, it is possible to use a metal module that I have often used for wood. For more details, you can refer to the Abaqus documentation (130.149.89.49:2080/v6.14/books/usb/default.htm) under the section 'Materials/Metal plasticity/Inelastic Mechanical Properties/Anisotropic yield/creep'. In my simulation, the Hill criterion has been used for the plastic properties of wood. En ce qui concerne l'élasticité du bois, the type: ENGINEERING CONSTANTS should be used

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  @mehmetcizer9 ай бұрын

  dear @@vandangtran6454 the link gives an error. and I couldn't understand the definition of plastic properties in abaqus. Also, how will I obtain hill criterion values ​​(potential data)? Is it possible for me to receive your e-mail address and benefit from your information? thanks for your return. Regards

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  @vandangtran64549 ай бұрын

  hi, you can contact me by [email protected] @@mehmetcizer

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  @mehmetcizer9 ай бұрын

  hi, how the plastic properties of wood are described in abaqus, Can you help or guide me on this? I can't find data or an example, I can't test it, I need to analyze in abaqus.

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  @mehmetcizer10 ай бұрын

  Dear Tran, thank you very much for your return. Are there any resources you can refer to in the literature for damage, plastic and potential data? Which type of wood does the data in this example apply to? Can I use this data in my work? Is it possible for me to get source information to cite the literature?

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  @mehmetcizer10 ай бұрын

  how to define solid wood beam material of abaqus? do you help me Dear Tran? I couldn't find how to define plastic properties

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  @vandangtran645410 ай бұрын

  Hello, there is no module for wood in Abaqus, but we can use Hill's criterion existing in Abaqus to define the plasticity of solid wood. For the document, you can consult the abaqus document: 130.149.89.49:2080/v6.14/books/usb/default.htm ( Materials/Inelastic Mechanical Properties/Anisotropic yield/creep) ; to know how to set the application on abaqus, you can watch this video: kzread.info/dash/bejne/gmmH1baGf9i9krw.html (from 0:36). Good luck!

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  @user-sx6dx7vx2y10 ай бұрын

  Hi Van, thank you for sharing the video. How can apply cyclic loading for damage model?

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  @engrsherkhan823010 ай бұрын

  Dear Van Dang Tran, I hope you are fine. I have watched hundreds of tutorials to solve my problem. unfortunately, I did not reach a solution. after watching your tutorials, I got near to the solution. I want to model the pull-out test such that I want the cohesive behavior to be inserted between the concrete and rebar which you have done in this tutorial. however, only the thing I am stuck on now is creating the surfaces of embedded rebar and of the region of concrete where the rebar interacts with it. you are doing the same work I want to do. would you please do the work you did in this video from start to end in detail such that the bond between the rebar and concrete is represented by cohesive behavior as is done in this tutorial? But only the problem is to create the surfaces so that they are assigned cohesive behavior. Notice that I am not talking about creating cohesive elements (inserting zero-thickness elements and then assigning them a cohesive behavior). However, it would be a blessing if you make videos for both methods.

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  @mehmetcizer10 ай бұрын

  hi how to define cedar solid woods of abaqus,

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  @maingocphuonguyen705010 ай бұрын

  Chào thầy ạ, thầy cho con hỏi là làm sao xác định được các giá trị của Knn, Kss, Ktt của cohesive behavior, và các giá trị của damage (normal, shear,....). Con cảm ơn thầy

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  @vandangtran64547 ай бұрын

  Chào em, các giá trị này là các giá trị giả định của mô hình traction-separation model; để xác định được thì có thể làm các thí nghiệm phá hoại theo mode I; II hoặc III. Sau đó mô phỏng lại trong Abaqus, có sử dụng traction-separation model. Bước tiếp theo là tìm các giá trị K, damage của mô hình mà cho kết quả gần đúng nhất với kết quả thí nghiệm, bằng cách thay đổi các giá trị này, chạy mô hình với mỗi lần thay đổi. Best regards!

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  @user-uq5pv3vz5d4 ай бұрын

  in ENGLISH please the value of kss,ktt and knn whatrepresentst and units ?@@vandangtran6454

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  @nafissasakhri756811 ай бұрын

  Hello Sir, please how to do the partition of an embedded steel rebar according to its host dowel concrete?

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  @logainalhelwani193711 ай бұрын

  Hello sir, is there a reference or code for the cfrp characteristics that you entered in the program? because I want to put a reference at the end of my master's thesis for the cfrp inputs that I relied on from this video😢

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  @vandangtran64547 күн бұрын

  Hi, sorry i did not save the reference. Just an example !

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  @brnsndr200011 ай бұрын

  28:00 fb0/fc0 should be equal to = 1.16 k = 0.667 I think you mixed them up

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  @siphephelozulu2159 Жыл бұрын

  Hi sir, how did you calculate your potential under plastic (Hills anisotropy-Anisotropic yield I assume). I've looked into the Abaqus documentation. I'd really appreciate it if you could explain how you get your inputs, for example where stress sigma one-one comes from relating to R11, etc. are found in order to formulate the potential. Thanks in advance.

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  @vandangtran6454 Жыл бұрын

  Hello, Some characteristic parameters of the wood are recovered from experimental tests. For example, the R1 is based on a pure tensile test of a wood specimen in the fiber direction. I believe that R1 and E1 are based on experimental tests; the others are based on R1 and E1 using references that allow these values to be deduced from R1 et E1. Regards!

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  @fayevong99 Жыл бұрын

  Hi, dr, do you mind do a pull out test in concrete for reinforcement bar, currently studying and stuck in the model 😢

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  @vandangtran6454 Жыл бұрын

  Hello Faye, tell me where you are stuck? can you explain to me in detail by mail?

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  @fayevong99 Жыл бұрын

  Hi Dr, actually I am doing the modelling of pull out test for reinforcement concrete with confinement, based on the experiment,the concrete will crack and fail first within a max load , the reinforce my bar will slip, but in my modelling, I think because I am using tie constraints in ABAQUS and what I made become the reinforcement bar will fail first and cannot get the maximum load that concrete fail, may I ask how to tie the concrete with the bar and how can I finding the maximum load that concrete will fail in modelling in Abaqus ? Is that possible to made that😭 sorry and thank you so much

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  @vandangtran6454 Жыл бұрын

  @@fayevong99 Hi Faye, first of all, we need to talk about the phenomenon of failure of the test that you explained. we can see that the concrete has been damaged by the cracks. there are therefore two types of cracks (local and global), here we're talking about global cracks. The cracks appear because the reinforcement (steel bar) has exceeded its capacity and is no longer able to hold the concrete. Once the concrete is damaged, the steel bar can slip. However, before the concrete is damaged, the reinforcement is considered not to have slipped into the concrete. Ok! Now it all depends on your objective. If you want to simulate the overall behavior of the specimen with a combination of steel and concrete behavior, I think that's sufficient for what you're doing (so the rebar is embedded in the concrete). By the way, if you really want to simulate rebar slippage, i.e. the phase after concrete damage, you'd have to create the 3D model as shown in this video. if you have other questions, don't hesitate!

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  @fayevong99 Жыл бұрын

  ⁠@@vandangtran6454 Hi Dr, may I ask if I simulate rebar slippage, am I be able to find the maximum force that cause concrete to fail and crack? Btw Thank you so much for ur clear explanation and passionate✨

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  @fayevong99 Жыл бұрын

  @@vandangtran6454 Hi Dr, actually the objective of my project is to determine the bone strength between reinforcement bar and concrete, but in order to find the bone strength, I need to obtain the maximum forces/ load that causes concrete to fail

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  @chikhinassima4175 Жыл бұрын

  Thank you it's very interesting

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  @oanimxe803 Жыл бұрын

  can you send me data cfrp please

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  @jhonipersimanjuntak9041 Жыл бұрын

  Hello dr tran, can i ask your help for my thesis. I have problem with numerical model. Its about bond-slip on reinforcement concrete. How i define the cohesive contact for surface interaction rebar and concrete?. Thank you sir.

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  @vandangtran6454 Жыл бұрын

  Hello, this is an example: kzread.info/dash/bejne/kaxqkpJ_abHgqs4.html You can use "surface-based cohesive behavior" (see more in abaqus documentation)

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  @boudjemaaroudane4288 Жыл бұрын

  Do you have a website or something to contacte you

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  @vandangtran6454 Жыл бұрын

  Hi! you can find my email in "ABOUT" of my channel youtube.

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  @abdallamahzouz9179 Жыл бұрын

  Please tell me how to accurately model the RC wall under cyclic loading and consider the PINCHING effect in Abaqus? I need easier ways to get the accurate results

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  @ziyuanwang5332 Жыл бұрын

  music so loud, lol

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  @vandangtran6454 Жыл бұрын

  yes! i agree with you. i did not pay attention. maybe you have to turn down the sound!

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  @gatradewaoktananda1096 Жыл бұрын

  Hallo Dr Tan, thanks for sharing the video. I have tried to create a model as shown in the video, but the results are quite different, with a larger Misses Stress. Are there any other parameters that need to be inputted? Thank you.

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  @vandangtran6454 Жыл бұрын

  Hello, If you did everything the same, but the result is not the same, there may be something that can be missed. without looking at the model, cannot provide an exact answer at the moment. However, consider something that may be a possibility: in the section definition, pay attention to the value "plane stress/strain thickness: 1" for the default value, but you need to fill in: the thickness (width) of the beam. good luck!

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  @gatradewaoktananda1096 Жыл бұрын

  @@vandangtran6454 Okay sir, thanks for your help. I will fill the thickness of the beam.🙏

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  @user-dj9db9ot7s Жыл бұрын

  at 35:32, there are already two predefined fields and then you are showing third one. please explain the first two.

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  @vandangtran6454 Жыл бұрын

  Good morning, you have well noted! but what I wanted to say is that these first two "predefined" must be deleted and have not been taken into account. They are just tests that I made during the simulation. but I forgot to delete them when I made the video.

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  @kristiannrtoft2117 Жыл бұрын

  Are there any possibility to get the final file from this video? thanks for a good video

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  @mariogalindoq Жыл бұрын

  This is one of the worst video I have ever see! Too many mistakes. It seems the author is learning how to solve the problem. I don't see the anchors at the end of the wire.

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  @vandangtran6454 Жыл бұрын

  Thank you for your comment! I see that you have carefully watched my video and found some mistakes in your way. but I would like to ask you: why do we need an anchor in the case where the steel cables are embedded (fixed) in the concrete?

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  @mariogalindoq Жыл бұрын

  ​@@vandangtran6454 You need anchors at the ends of the cables to model the fact that the cables are stressed when they are free (not attached). Subsequently, concrete is injected into the sheath, which is when the adhesion between the concrete and the cable occurs. It is also possible to work with non-adhered cables, so it is mandatory to have anchors at the ends of the cables. In any case, the stress state of the concrete is strongly affected by the anchors at the ends of the beam. The way you have modeled the beam corresponds to that of prestressed concrete, this is when the cables are first stressed before the concrete is poured, however this is not normally done with curved cables. So you have three different cases: 1) The cables are tensioned without adherence and later the sheaths are injected to produce adherence, 2) The cables are stressed without adhesion and remain so during the useful life of the beam, 3) The cables are stressed before the concrete is poured. The three cases have different results in the stress state of the concrete. For cases 1 and 2 it is necessary to model the anchors at the end of the cables. Thank you for your response to my somewhat aggressive comment. My apologies. Sometimes I write without thinking. Anyway I encourage you to continue with your videos.

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  @haulehuynhquang6672 Жыл бұрын

  Chào anh, anh có thể cho em xin file thông số đầu vào và CDP không ạ? Em cảm ơn anh nhiều.

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  @vandangtran6454 Жыл бұрын

  Hi bạn, mình để link download model trong phần community nhé.

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  @haulehuynhquang6672 Жыл бұрын

  @@vandangtran6454 Dạ em cảm ơn anh nhiều, em rất vui khi được biết kênh của anh.

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  @thanaphatthinkhawnoi1402 Жыл бұрын

  I have somequestions for my senior project in prestressing cold-formed steel beam. I created predefined fields for the initial and final temperature for the cable and run in static,general. But when I look at the strain or temp at a node on beam element it did not transfer the thermal expansion, how can I solve this.

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  @vandangtran6454 Жыл бұрын

  Hello! I don't know how it works exactly without looking at the model. But when you apply the thermal, pay attention to the type of element, and the boundary conditions! good luck

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  @daifukumochi3686 Жыл бұрын

  god dammit i hate doing this but wish me luck I will complete my college. ill be back if I did, anyway thx for the vid

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  @daifukumochi3686 Жыл бұрын

  interaction 32:02

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  @vandangtran6454 Жыл бұрын

  Hello, more precisely, it is the fact that steel is embedded in concrete. So, any deformation of the steel is related to that of the concrete.

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  @lostkid_007 Жыл бұрын

  Hello. I was not able to understand how the error was been resolved ? The video is not showing the error elimination of property of 22 elements. Can you please let me know how to resolve the error ? Thanks in advance.

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  @vandangtran6454 Жыл бұрын

  Hello, I assume you are referring to the error regarding the property of the steel to be defined. So, steel is put as a bar-type element in 2D; therefore, you should define a material corresponding to this type of finite element.

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  @lostkid_007 Жыл бұрын

  How to import line geometry from autocad to abaqus ? For my case the section depth varying and preparing it in autocad is easy but I am not able to import the line elements into abaqus. Please let me know a way forward,

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  @vandangtran6454 Жыл бұрын

  if it is not complicated, you can draw directly in abaqus. You can see on this video also: kzread.info/dash/bejne/Y4d327KvncmZkdY.html

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  @lostkid_007 Жыл бұрын

  @@vandangtran6454 section is varying on length and its very long. Please let me know if I want to use solid element for reinforcemwnt then what are the possible way to do it....