torsional irregularity in the first two modes

E

etriye

New Member
Friends, first of all, good work, easy work. In my project, I encounter torsion in the first 2 modes. Is it caused by 5% eccentricity when the rigidity centers are on top of each other? Is it due to 5% eccentricity when the regulations increase the internal forces Do you think this measure is enough, since the rm is on the top and due to the eccentricity, serious torsion comes out with management, everything is governed I think it shouldn't be restricted.
 
"etriye":1t9phkvk" said:
Friends, first of all, good work, take it easy, I'm facing torsion in the first 2 modes in my project. Is it due to 5% eccentricity when the rigidity centers of the poles are on top of each other, is it due to 5% eccentricity. serious torsion occurs, it saves the regulation, but I think everything should not be restricted by regulation
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If you add the project, we can look at the subject.
 
There are more than 2 projects in the files you added. Exactly which ones should we look at? How did you find out that the first two modes are torsion? It would be nice if you could write a description on this project like, see here. For example, when we look at 41.ide7, in the dynamic analysis report, it is seen that there is 1st mode torsion, 2nd and 3rd mode translation, the first 2 modes are not torsion. In addition, a problem is observed in the beam-panel intersections in the geometry control. Some beams are up in the air. When these are fixed, the build behavior may change. Similarly, "unsupported beams" appear in the geometry control in 41a.ide7. First of all, you need to fix such problems in your project. However, mods are not as you write. It seems that there is 1st mode torsion, 2nd and 3rd mode translation.
 
In my 4+1 project, torsion seems to be visible. Can you specify the places where the beams are suspended and the panel beam intersections are faulty, Hakan, they have escaped my attention. When I say torsional irregularity in the first 2 modes, I mean torsional irregularity in 2 modes, I think it's misunderstood.
 
"stirrup":2dvyzcie" said:
when I said torsional irregularity in the first 2 modes, I meant torsional irregularity within 2 modes, I guess misunderstood
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Your project has A1 torsional irregularity, but it has nothing to do with modes. You don't need to do it because we apply both 5% eccentric and mod combination method. For detailed information, check the relevant article in TDY. If you mean another issue, add a screenshot. Good work
 
no, Hakan, exactly as you said, since the km and rm centers are on top of each other, when 5% is applied to the eccentric, torsional irregularity in the first modes inevitably appears as per the regulation. They said it would be good if you go, I said that it was due to the regulation, I have hesitations about that... So there does not seem to be a problem as a regulation, but it would be better if there was no torsion in these first 3 modes
 
The friend in the building control said that it would be better if there was no torsion in the first 3 modes, how an example model was created, if you ask, we will learn! In a model with a high ductility selected and 5% eccentricity applied, it is very likely that torsion will occur in the 3rd mode at most. G.KÖSE
 
The topic has expired, but I wanted to write it for those who will read it later. Torsion formation in the 1st mode in the structure is not related to 5% eccentricity. It is necessary for the calculation of the internal forces to be used in the dimensioning of the elements. The fact that the structure is torsion in the 1st mode indicates that the dominant behavior of the building will be torsion. This situation can be corrected by carefully placing the carrier elements in the plan. Because in 1st mode, it is necessary to avoid torsion.
 
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