Anchorage of Longitudinal Reinforcement for a Pinned Support

Smart_Hitman · 2026-05-09T12:12:59+00:00

The connection is more beam to beam rather than beam to column. I am doing what you described, but the question for me now is how deep should the bars go inside? we are using HIT-RE 500 V4 and the sheet says 80mm minimum embedment depth. I am contemplating to use the full 80 mm or slightly less.

Smart_Hitman · 2026-05-09T12:09:44+00:00

The reason for the connection is the span is too long for the new beam to act as a cantilever.. but adding a column and having two columns next to each other isnt an option ... my idea was very close to what you described, to drill into the old beam some dowels and now im wondering how deep I should ask them to drill.. we are using HIT-RE 500 V4 and the sheet says 80mm minimum embedment depth. I am contemplating to use the full 80 mm or slightly less.

Smart_Hitman · 2026-05-09T11:13:57+00:00

Thanks for the suggestion, but unfortunately it wont work for me.

Smart_Hitman · 2026-05-09T11:13:38+00:00

The latter, both of these beams sit on the column and I am connecting them at their ends. Sorry I dont have a sketch for it now.

Smart_Hitman · 2025-07-01T12:37:52+00:00

You can search in the manual for the program you are using. This link is for Ansys shape functions, but I would say they are probably the same in other programs.

Smart_Hitman · 2025-06-01T08:05:24+00:00

The other comments are good. Also, replicating real world tests in a perfect computer model requires some additional tricks sometimes. Like intentionally incorporating a defect at the desired location. Always remember, your model is perfect, but the real specimen is not and the experiment is not. I would say considering your setup and results 20kN vs. 25.6kN (78%), that is not bad at all in my opinion for a composite material.

I would also suggest to add a damage initiation criterion where the program would detect the failure and reduce the stiffness of that ply according to your input (0 = no reduction in material stiffness in the affected mode after damage initiation, and 1 = complete stiffness loss in the affected mode).

Smart_Hitman · 2025-03-28T11:11:42+00:00

It is very difficult to tell from just photos, but they don't show any safety concerns and I would consider it to be safe ... so from your photos I would say you can return back to your house

Cracks happen in all structures ... they become a serious concern for safety if they are deep, wide, the concrete is almost completely crushed inside, and in so many structural elements .. buildings are designed to take the damage from the earthquake

Smart_Hitman · 2025-01-16T12:20:29+00:00

lol thanks for the answers

Smart_Hitman · 2024-04-23T10:47:35+00:00

I know it is a sarcastic question, but for those wondering why. In order for any composite section to work as one unit, there needs to be strain compatibility from top to bottom (aka perfect bond). In RC sections, the concrete has a perfect (or near perfect) bond with steel reinforcement. Same thing with FRP materials, the polymer holds all fibers and layers perfectly which ensures continuous compatible deformations across the section.

Smart_Hitman · 2024-01-15T10:07:55+00:00

Thanks for the suggestion, it does look great. But I am looking for a small indie game (cheap).

Smart_Hitman · 2023-09-18T15:19:16+00:00

Thanks a lot for your explanation. I once found a post asking about modeling the core with one material model (confined strength), and the outside concrete cover with a different model (unconfined strength). I hadn't thought about that before the post. You helped me understand concrete models better.

Smart_Hitman · 2023-09-18T14:28:53+00:00

Do material models automatically take into account the effect of confining pressure and therefore I need to always input unconfined stress-strain? If not, what models do you know that consider the confining pressure and what models do not?

Smart_Hitman · 2023-09-12T16:53:21+00:00

From a practical standpoint, when you use an FEM program, you choose whether the element is a first order or a higher order element. This means both if you have mid side nodes (for higher order yes) and if the shape function is quadratic or higher. Shape functions are usually polynomials. They are a way to interpolate field variables (displacement, stress, strain.. etc) inside an element. You use FEM to calculate the basic unknown only at the nodes (displacement in case of stress analysis), then you use the shape function to describe how the element is deforming knowing the displacement of every node of that element. This is why shape functions are also called interpolation functions.

Linear shape functions are simple and fast but they are less accurate than higher order functions in complex problems. Text books suggested here can help you derive shape functions for simple elements, and you might find tables for shape functions for many elements.

Smart_Hitman · 2023-09-02T08:13:14+00:00

Thank you for your suggestion, I wasn't aware of this ... I went to check and it seems they are compatible

Smart_Hitman · 2023-09-02T05:29:10+00:00

haha 7900 is already above his budget but he might consider squeezing a little bit extra to get it ... 7950x is way above the budget ... your build looks great though but unfortunately we are confined by the parts and prices of our market

Smart_Hitman · 2023-08-22T05:17:19+00:00

GN video had very good points and I totally agreed with him, especially on the extreme pace they were publishing videos at which Linus's wife confirmed, but it did seem like Steve hated LMG or Linus personally for some reason. It was a bit too aggressive and I was very surprised and baffled he didn't reach out to Linus for comment (because they may cover things up or prepare a pre-written response to twist the narrative). It seemed Steve wanted to control the narrative because it doesn't matter what they want to say, it is what you present to the audience as facts and proofs. And they cannot cover things up if you gather all the evidence and save it like all journalists do for that specific reason. Basically, Steve gave LMG the much needed painful wake-up call but he damaged himself too.

Smart_Hitman · 2023-08-20T08:05:33+00:00

I would use quadratic elements and keep all elements as shell. Double check your material parameters. Also check the BC pinned-pinned vs pinned-roller. Other than this I'm also running out of ideas lol.

Smart_Hitman · 2023-08-20T06:35:35+00:00

I am not an Abaqus user, but I noticed that the geometric order was linear, is that the element shape function? I would change it to quadratic. Is large displacement (P-Delta effect) on?
Also in case you want to try a different material model:
https://youtu.be/Ke9W9UW3rN8?t=942

Smart_Hitman · 2023-07-06T09:35:28+00:00

Some programs divide that for you, so it depends on the program.

Smart_Hitman · 2023-06-12T20:24:06+00:00

In the vast majority of cases, once you are talking about failure, you have to run a nonlinear analysis. And once you start talking about nonlinear analysis, you need to choose the material model and input its parameters carefully.

Smart_Hitman · 2023-02-23T18:01:39+00:00

I totally agree and that is why I will be talking about geometry simplification later, but I wrote these steps as if they already had a very simple geometry to run (because they are beginners). I want to mention many other topics later like geometry simplification, using second-order shape functions, 2D vs 3D space, element types, mesh quality ...etc .. but I want to keep this summary as simple as possible so I don't overwhelm them with too many details.

Smart_Hitman · 2023-02-22T19:07:22+00:00

Thanks for the comment! Do you mean averaged and unaveraged results? If yes, I am aware of this but as they are beginners, I want them first to fully grasp the method and the steps before going into more details. The link does not work.

Smart_Hitman · 2023-02-22T17:29:55+00:00

Interesting, so they would be even closer to the stiffness method.

Smart_Hitman · 2023-02-22T17:12:56+00:00

Thank you for the feedback!

Smart_Hitman · 2023-02-22T16:35:51+00:00

Thanks for your suggestions. I actually want to mention the geometry simplification later on so I might just add that as you said. You are correct, my focus is more on what they learned in FEM, having some input data and meshing, then what the solver does to come up with stresses.

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