Insufficient number of mods (even though I went up to 250...)

[celikbey]

Hello to all of you. In the attached project, I get the error that the number of mods is insufficient. When I first solved the project, I made the upper rigid basement -1 for Y, forgot 0 for X. I have corrected and analyzed, but this time I am getting a warning of insufficient number of mods. When I checked the dynamic analysis from the optional reports, I saw that the mass participation rate could not reach 90%. Can you help me? Thanks...

 

[Levent Özpak]

Re: Insufficient number of mods (even though I have reached 250..

Hi all. In the attached project, I get the error that the number of mods is insufficient. When I first solved the project, I made the upper rigid basement -1 for Y, I forgot 0 for X. I corrected and analyzed, but this time I got a warning about insufficient number of modes. When I checked the dynamic analysis from the optional reports, I saw that the mass participation rate could not reach 90%. Can you help? ...

Hello, You have requested technical support on this project before on the forum

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In the above link, when a solution is made according to the semi-rigid diaphragm acceptance in the review_b_b.cde project and the upper rigid basement floor number is defined as -1 in both directions, it does not give a mode insufficiency warning.

 

[celikbey]

Re: Insufficient number of mods (Although I have reached 250.. Hello Mr. Levent. I request you to examine the attached file. Because the attached file gives an error.

 

[Levent Özpak]

Re: Insufficient number of mods (even though I have reached 250..

Hello Mr. Levent. I request you to review the attached file. Because the attached file gives an error. quote] There is a data entry error in the project you added. The floors between the BB axis (floors at zero elevation) are connected to beams at -86 cm elevation.) You were informed about this in the previous message.

 

[celikbey]

Re: Insufficient number of mods (even though I went up to 250.. If Levent Bey is due to a data entry error, then why does it not give an error when the Y-direction upper rigid basement is -1? This is the 2nd interesting point. The ide file attached to the message is a structure with the same building only the ground level difference.I made the X and Y directions -1 in it, it did not give the same error, but it gave an error in the same 4 buildings whose elevations were changed.There is something strange.

 

[unver]

Re: Insufficient number of mods (Although I have reached 250.. Hello If you remove the main_block in the basement curtains given as a problem, there is no problem in the number of mods. The program does not give an error.( As in the maintenance building, if you take it low, it may not come out.) When calculating, basically remove the DS.

 

[Levent Özpak]

Re: Insufficient number of mods (even though I went up to 250..

If Mr. Levent is due to data entry error, then why Y direction upper rigid basement - It does not give an error when it is 1?

The building is single storey... When the structure is considered rigid in one direction, the story forces are determined by equivalent load Tdy 2007 item 2.7.2.4 figure 3.6

2. At the interesting point The ide file attached to this message is also a structure with the same structure only the ground level difference.I made the X and Y direction -1 in it, it did not give the same error, but it gave an error in the same 4 buildings whose elevations were changed.

In the project you add, the heights of floors, the heights of basement curtains, etc. Good work

 

[Levent Özpak]

Re: Insufficient number of mods (even though I've reached 250.. If you have an additional 8 version, the calculation method according to Ritz vectors can be used to solve such structures with a lower mod number.

 

[celikbey]

Re: Insufficient number of mods (even though I went up to 250..

Levent Bey, because of data entry error , then why does it not give an error when the Y direction is upper rigid basement -1?

The building is single storey... When the structure is assumed rigid in one direction, the floor forces are determined by equivalent load Tdy 2007 item 2.7.2.4 figure 3.6

2. At the interesting point, the ide file attached to this message is a structure with the same structure only the ground level difference. I made the X and Y direction -1 in it, it did not give the same error, but it gave an error in the same 4 buildings whose elevations were changed. .

The height of floors, the heights of the basement curtains, etc. differ in the project you added with your project that gave a mode failure error, etc. Good work

Mr. Levent, I already told you that the buildings are at different elevations. But everything is the same except the ground elevations. Type project anyway. But why is this happening? Is there a solution? Perd I know that when you delete your hands, the problem goes away. and if you have noticed the results are fixed after the 4th mod.

 

[HakanŞahin]

Re: Insufficient number of mods (even though I got up to 250..

Mr. Levent, if it is due to a data entry error, then why does it not give an error when the upper rigid basement floor is -1 in the Y direction?

The building is single storey... When the structure is considered rigid in one direction, the floor forces are determined by equivalent loads. Tdy 2007 item 2.7.2.4 figure 3.6

2. Interestingly, the ide file attached to this message is a structure with the same structure only the ground level difference. It didn't give an error, but it gave an error only in the same 4 buildings whose elevations were changed.

In the first project you added with your project that gave a mode failure error, the heights of the floors, the heights of the basement curtains, etc. Good work

Levent Bey, I already told you that the buildings are at different levels But everything is the same except the ground levels. It's a type project anyway. But why is it happening? r like this? Is there a solution? I know that when the curtains are wiped, the problem goes away. and if you pay attention to the results after the 4th mode.

Since the curtains are not connected to the rigid diaphragm, it is normal for the need for the number of modes to increase according to the eigen method in order to provide the required mass participation rate. The results after the 4th mode are not stable, they increase slightly, you cannot see them due to the number of steps. If you look at the advancing modes, you can see that it has changed. In the attached project, data entry regarding floor elevations has been arranged. We recommend that you continue your project by taking this data into account.