Robot Structural Analysis

## Robot Structural Analysis

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Posts: 105
Registered: ‎04-15-2011
Message 1 of 28 (2,338 Views)

# Pile Caps with Robot

2338 Views, 27 Replies
05-31-2011 01:07 PM

I would like to know if it is possible to design pile caps using Robot. Thanks, Gustavo

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Posts: 297
Registered: ‎12-13-2010
Message 2 of 28 (2,344 Views)

# Re: Pile Caps with Robot

05-31-2011 01:56 PM in reply to: gustavo.c.vasconcellos

No chance to do it with design object like foot or the longitudinal foundation.

Most RSA users are modelling panels as elements acting the pile caps.

This idea lets to design a pile cap as RC plate with respect to its thickness and other outer conditions.

Due to code of design program checks all ULS and SLS conditions with punching included.

Jakub Brożonowicz
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Posts: 105
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Message 3 of 28 (2,341 Views)

# Re: Pile Caps with Robot

05-31-2011 04:31 PM in reply to: gustavo.c.vasconcellos

Thank you,

do you have an example that you can send to me?  Gustvo

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Message 4 of 28 (2,320 Views)

# Re: Pile Caps with Robot

06-01-2011 02:28 AM in reply to: gustavo.c.vasconcellos

Here is a simple model file.

Design as plate with simple elastic support conditions acting piles.

Run design process by code according to your choice.

Jakub Brożonowicz
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Posts: 80
Registered: ‎05-29-2012
Message 5 of 28 (1,667 Views)

# Re: Pile Caps with Robot

10-30-2012 09:11 AM in reply to: gustavo.c.vasconcellos

Hi,

Im trying to model a pile cap, I have given the vertical force and moments acting on the column that will be resting on the pile cap.

To get the forces acting on the piles, I modeled the piles as fixed node supports connected to another node where the forces are applied. The results are satisfactory.

Tried the same thing with stiff bars, the reactions are not satisfactory.

Also will be helpful any suggestion how to apply the force in order to get satisfactory results on the plate ( pile cap).

The above cases( rigid links and stiff bars) the moments on the plate are ZERO, I think because the forces are introduced directly to the supports, and no forces act on the plate.

Please correct me if I am wrong and any help will be appreciated

Thanx

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Message 6 of 28 (1,624 Views)

# Re: Pile Caps with Robot

10-31-2012 02:45 AM in reply to: CKDDIZ

Perhaps this will be what you need

Artur Kosakowski
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Message 7 of 28 (1,614 Views)

# Re: Pile Caps with Robot

10-31-2012 03:10 AM in reply to: gustavo.c.vasconcellos

thank you for your help, i tried what is explained in the picture.

the piles are designed as slab-rigid diafragm???what about the column force acting place also slab-rigid diafragm or flexible???

Is the force applyed as a node force-moment in a node that is in the column acting place?

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Message 8 of 28 (1,612 Views)

# Re: Pile Caps with Robot

10-31-2012 03:16 AM in reply to: CKDDIZ

The support (pile) size is modeled as the central node plus rigid links. The column (size) is modeled as a central node with applied loads plus rigid links. The panel is defined as a shell.

Artur Kosakowski
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Message 9 of 28 (1,598 Views)

# Re: Pile Caps with Robot

10-31-2012 05:06 AM in reply to: Artur.Kosakowski

Thanx again,

anyway I tried this option too, and the reactions are almost the same as using the stiff bars?! (not satisfactory)

Attached to this post is what I am trying to model in RSA, in the pdf file the model is calculated manually, I get the same results for pile reactions, can't say the same for the moments.

Any help will be appreciated

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Message 10 of 28 (1,586 Views)

# Re: Pile Caps with Robot

10-31-2012 06:04 AM in reply to: CKDDIZ

You may add rigid links to model the influence of piles' and column's cross sections on the pile cup.

Artur Kosakowski
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