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Hi, I am designing footings for columns in a building. The slabs are 200mm think one way. I am just wondering which one is the correct way to model slabs, one way membrane or thin shell with 0 M22 (90 degree on Local axis 2). I got two very different results from these two and don't know which...

Hi Agent666. Thanks for your information. There is no columns but walls. Please see pics below. Like I said, as there are voids in the middle I intent to design it as two separated slabs D1 D2 as shown below. I am concerned that if I can use the walls in blue as shear walls for 2-4F. And how do...

Thanks for replying dik. There are no columns but walls on edge running in x direction which I didn't draw.

Thanks Edub24. Are you talking about the torsion effect? I don't use ASCE 7 but I will have a look. Thanks.

Thanks Jayrod12. This is actually what I was concerned about. How can I know if the slab is stiff enough? As the slab run in Y direction (there are walls running in X direction that I didn't draw on the plan), and the transfer slab doesn't need to be very thick for vertical loads. So does that...

Thanks jayrod12. Are you saying that the non-core walls can still work as shear walls for second floor and above even though they stop at transfer slab on the first floor?

Hi all, I am designing a multi-storey buidling which has a transfer slab on the frist floor. Because of this transfer slab, the walls above 1F cannot work as shear wall as they dont go all the way to the ground.(Please correct me if I am wrong). So the only walls I can rely on are the core...

Thanks guys. Very helpful information.

Thanks for your reply civeng80. Unluckily I can't move the external walls. They sit just next to the boundary with no gap.

Thanks for your reply JAE. How do I know how many internal strip footings are enough using simplified method? As I have slab on ground sitting on the strip footings as well. Can I take that into consideration and how do you normally comp it if so? Thanks.

Hi Guys, I am just wondering how you guys deal with strip footing on boundary. The project I am working on now is a 3 storey building. Allowable bearing capacity is 100kPa for 100mm into silty clay and 250kPa for 600mm into silty clay. As the external walls are adjoining to the boundary so there...

Hi Trenno, sorry they were shell internal forces. I just chose F11 & Mmax as examples. Yes all the local axes of all the shells aligned are the same. And the column reactions are the same too. Also, even if I divide the wall into more areas, from the F11 results of the walls I can see that at...

Trenno thanks for your reply. That's what I was trying to do but before that I would like to know what the difference is between dividing shell into multi shells & simply assigning meshes. As you can see from the slab above using these two methods, the stress results differ. Thank you.

Hi, I have a few questions regarding modelling in FEM software. Let's say I have a tranfer slab which is gonna support the walls above. So I have modelled it in two different ways like below. The first one is using multi shells around the columns below and walls above. The second one, on the...