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ABAQUS - Wall System

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MTohmeh

MTohmeh

Structural
May 21, 2013
14
Hello,

I am thinking about modeling a wall system. The wall system will consist of a reinforced concrete column in between two masonry infill walls.

As shown here:

Capture1.png


I wish to investigate the effect that the masonry infill walls have on the column due to the fact that the walls do not go up to the full height of the column (creating a captive column condition and causing an earlier failure of the column than what would be expected.)

My questions are:

1. As I have never used ABAQUS before, how difficult would it be to model this system. Mainly pertaining to the material properties of the column.

2. If I am mainly interested in the Z-direction behavior (I plan on applying a displacement at the top of the column in the Z-direction), what would be the best way to model this wall? (i.e. 3D or 2D analysis)

Thank you,
 
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1. If you have little or not background in FEA, then jumping on to a problem such as this one is not be a good idea. It is much better to start with simple problems for which theoretical solutions are known.

To answer your question, this is a straightforward problem (assuming the material is one of the typical materials).

2. It depends, at least, on the phenomenon of interest or the experimental findings. If failure is of interest, I think you'd better get some supervision (assuming you have little or no background in FEA). Choosing the right material property and solver can become critical to the analysis, for example. Bottomline: You need to know precisely what you are interested in modeling. Is it deformation? Is it stresses? Is it failure? Are you interested in performing a static analysis?

You could use 1/4th or even 1/8th symmetry in a 3D model. However, since the geometry is regular, a 2D model will be a good starting point.

Are you new to this forum? If so, please read these FAQ:

 
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I've been trying to learn ABAQUS by doing simpler setups, for example I have attempted a steel rod tension test or a concrete column (square) compression test, however, I am struggling a bit with getting acceptable results.

1. The material is concrete, so I would hope that it would be "simple" enough to model its properties.

2. My main interest is in fact, failure. Which I realize might be the more difficult of the results to model. The analysis I am interested in is static.

I was hoping I would not have to get into 3D modeling since I am mainly interested in the Z-direction for this wall-system. How does ABAQUS deal with 2D systems, if for example, the column in the original post is 12x18 inches (18 inches being in the X-direction). In ABAQUS, I think the default is to draw the part in the X-Y plane; so would I give the part a thickness of 12 inches? Or would I change the wall alignment to go in the X-direction, so that when I draw in the X-Y plane I would give the part a thickness of 18 inches? I guess my main issue is knowing if I need to make sure the walls are aligned in the correct axis before moving on with the modeling.

I appreciate your patience with me, and I am currently looking into getting some help for this, but any additional help on here would be greatly appreciated.
 
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I am attempting to model this wall, now in 3D so that I can get more presentable results, since when I am modeling in 2D it does not show the thickness of the column or walls. I have a few more questions if that would be okay.

1. Is there a way to model that above wall system in 2D but show the thickness?

2. If I need to model in 3D to show the thickness for more presentable results, is there a way to limit the effects into only 2 dimensions, that way one of the dimension is more or less ignored.

Not related to the above two questions, what concrete material property model (i.e. concrete damage plasticity, concrete smeared cracking, etc), would be best suited for my problem. I am mainly interested in the shear forces on the column, I have looked through the documentation but it seems like when they discuss shear, they only consider plates. However, I am interested in the shear of a column, so if I model this column, how can I ensure that I capture the shear behavior of the column?
 
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Aren't you simply trying to model a plane stress problem? Check the documentation to be sure which one out of surface or membrane elements is applicable in your case. I also there may be one more element type applicable in this discussion. Like I said, check the Analysis User's Manual for element types. You could model the problem in 3D space.

Are you new to this forum? If so, please read these FAQ:

 
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The problem with a plane stress problem is that it requires the thickness (z-direction) to be very small compared to the X-Y dimensions of the object. But my column has dimensions of 18x120x12 (x,y,z or width,height,depth), which as per my understanding ], would not be applicable to the plane stress condition.

Please correct me if I am wrong.
 
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Oh ok, I wonder if plane strain would work. I am interested in the shear behavior on the column. I will look into plane strain on Abaqus.
 
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So it seems to me the best way to model this would be in 3D, at least that is my understanding. However, as I've been researching this issue, it seems like 3D elements do not have rotational DOFs, which may be a problem since shear/bending are more important to me in this wall system.
 
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You could also use beam (Euler-Bernoulli or Timoshenko) elements. If transverse shear in the column is expected, then Timoshenko beam will be a good choice. This option will let you carry out your modeling in 2D space.

Are you new to this forum? If so, please read these FAQ:

 
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