Cervenka Consulting Forums — Uplifting for the corners of the slab in concrete slab-column model

Re: Uplifting for the corners of the slab in concrete slab-column model

null@example.com (dpryl) — Tue, 04 Mar 2014 07:29:28 +0000

It is normal that the upward movement of the corners can only be observed relative to other parts of your structure (especially if the spring compressive stiffness is relatively low). Moreover, this is the same with interface elements, just there are more parameters which can be set wrongly or in an inconsistent combination.

Re: Uplifting for the corners of the slab in concrete slab-column model

null@example.com (umgouda) — Mon, 03 Mar 2014 19:19:49 +0000

Yes, actually the corners instead of moving up, they are moving down. So, can you please tell me another way. Or, for the method you described (elastic plate), can you please give me a source describing how to model it in ATENA, so I can look at it.

Re: Uplifting for the corners of the slab in concrete slab-column model

null@example.com (dpryl) — Mon, 03 Mar 2014 08:31:10 +0000

There are other ways, but, as already mentioned, more complicated. For example, you can model elastic plates at the supports, and use Interface elements for the contact between the elastic plate and the concrete. Compared to the springs, you have more elements, and, even worse, more parameters to determine/guess...

Is there any specific reason why you do not like to use spring supports?

Re: Uplifting for the corners of the slab in concrete slab-column model

null@example.com (umgouda) — Sun, 02 Mar 2014 23:49:37 +0000

Is there any other way?

Re: Uplifting for the corners of the slab in concrete slab-column model

null@example.com (dpryl) — Wed, 26 Feb 2014 08:55:41 +0000

Hello, the easiest way is probably a nonlinear spring support in vertical direction, with stiffness in compressive direction about 100-1000 higher than in tension.

Uplifting for the corners of the slab in concrete slab-column model

null@example.com (umgouda) — Wed, 26 Feb 2014 04:53:36 +0000

Hi,
I am having some difficulties to choose a support that could reflect the actual behavior of my model. In general, my model consists of a slab which is simply supported at the edges and there is a column stub extended on the top and the bottom of the center of the slab. I am applying the loads on the column stubs. My problem is that, the corners of the slab are moving upward at a load of approximately between 90% to 95% of the ultimate load. So, I need supports for the corners or interface element between the supports and the corners of the slab that prevent the corners of the slab from moving downward and allow for the upward movement. How can I do that in ATENA?