Horizontal forces generated by Vertical loads.

[Stilie87]

I have som weird results I need to comprehend.

In one of our models it is generated relatively large horizontal forces by the vertical loads. This seems to me unlikely.

These could also be found in panel results for walls. 

Any good solutions and Methods of qualifying these results?

[Rafacascudo]

Hard to tell without having the model and knowing which loads are you reffering to.

If possible , explain it better and zip the model before attaching

[Stilie87]

I am referring to horizontal forces generated by vertical loads. If you have a look at table results, you will see that vertical load cases generate relatively large horizontal forces on walls. (Try)

[Simau]

@Stilie87 

could you be more specific.
What combinations? which panels
Could you pointe a particular pannel and combiantion

[Rafacascudo]

Hi @Simau .

He is talking about the results given on "Diagrams for buildings" ,which I never used. But I imagine those results are given for each defined story

[Stilie87]

Not primarely. I dont use those diagrams either. But i made a screenshot to make a fact of the horisontal forces generated by dead-load. 

The walls/ panels in the Center of the building is getting horizontal shear Try from as an example dead-load, but also other vertical loads.  I an wondering if it is a result of modal-mass generation? As described in EC a percentage of vertical loads should included in the total modal masses. These have been added in the calculation. 

I dont have the model in front of me today, but i can clarify the issue more if its needed later on. By adding screenshots and tables. 

[Stilie87]

From load cases. DL is one example. 

[Simau]

@Stilie87 

Nothing wrong in your model.

Horizontal efforts (Try) are du to excentricities.

Look at this simple example in which wall 1 centered and wall 11 off center.

[Stilie87]

These forces seems to be to big. Are these results from a horizontal load case or from a vertical load case?  

[Simau]

Only Self Weigth

[Simau]

A little mistake in the previous model (forgot to add support)

[Stilie87]

I am in many ways not convinced about this. I don't think inplane excentrisities should produce forces AS big as these. They are larger than seismic loading alone. Are the modal masses contributing to horizontal shear in the table results? Since they are added in the seismic analysis?