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# Frame Element with Shell element

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## Frame Element with Shell element

(OP)
hi there, i have a question ,

Can i solve a problem using shell elements and frame elemnts together?? coz when i tried to do so, i noticed that the results in the frame elemnt is strange, it looks like the shell carries the frame elemnts (beams).

that made me solve the floor twice, one time to get the streeses in the shells and the other to get the reactions.

any other way around !!

### RE: Frame Element with Shell element

Pease, not enough info to offer any help. What are your boundary conditions? More info needed on geometry and loading.

### RE: Frame Element with Shell element

(OP)
im just saying that when u solve a plan (beams and slabs), we should expect -ve moments in the slabs over the interior beams as there is Continuty in slabs, but when we solve frame elements and shell elements we found that the slab over the interior beams got +ve moment not -ve, it looks like it assume it is not full rigid,

is there any way to make the sap2000, assume that the beams is full rigid so it get -ve moments in the slab sections above the beams !!!

thx for concern

### RE: Frame Element with Shell element

When you are modeling floors wit frame and shell ellements it is not allays shure that you will have -Moments over interior beams. Sometimes the stiffness of beams is not so big so when they deformed dounwards the negative moment may not occure. (As SAP is using deformation methods when calculating stressess and forces). So you will find corect result modeling floor this way.
But in most cases we assume that beam are fully rigid and we are using bi calculation method you describe above. if you can try CSI "SAFE" it is specialy made for plates.

Hope this helps

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