Why Robot doesnt Calculate the punching above or under walls (raft case )

[mustafahesenow]

Hi all,

I am just wondering why Robot doesn't calculated the punching for slabs or raft above or under walls .

Suppose to be all the data is there already . So what is the difficulty regarding this issue make RSA doesn't do this calculation.

[Artur.Kosakowski · Accepted solution]

Hi @mustafahesenow

I'm sorry for answering 'because such verification procedure has not been implemented in the program' but this is all I can write 

Perhaps you could consider creating  a new model with the bottom level of the structure with columns replacing the walls and raft foundation only with loads on columns taken from the reduced results from panels (walls) instead?

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[mustafahesenow · Accepted solution]

1

[Artur.Kosakowski]

Hi @mustafahesenow

Indeed for walls only above or below a slab it sounds easy however the difficulty starts when you have them on both sides as you have to determine if they are one above another as we need to determine unbalanced moments (easy for columns as they have common node). In addition there may be the situation where you have a wall below and separate columns at the next level above it, walls with U shape or being longer and shorter etc. 

Anyway I have forwarded your suggestion to the development team. Thank you for posting it. 

[mustafahesenow · Accepted solution]

1

[Artur.Kosakowski · Accepted solution]

Hi @mustafahesenow

You are absolutely right if you look at this with your structural engineer's 'look' however having a number of surface elements on both sides the questions among others are:

1. Which point along a wall to check?

2. How to determine 'matching' elements on both sides of walls 

3. What to do with averaging results (if a slab is defined as a single panel) for elements on both sides of the wall

etc.

For the above reasons for columns the unbalanced moments are determined based on results from the common node of the top/bottom column (bar forces). 

Let's give this challenge to the development team as they may find out a smart solution that my brain can think of at this moment