Modal analysis and period

A

agure

New Member
Good day, I am a final year civil engineering student. I use idecad program in my graduation project. My project is the analysis and design of an existing multi-storey building. First of all, the current project was analyzed with another package program. I modeled the same project (the sections are the same) in the idecad program. In mode 1, my period appears to be 1.004 seconds. But in the current project, the period of mode 1 starts from 2 seconds. My project consultant said that there would be no such difference, there might be an error in his system. I thought it might have something to do with the building weight, but he said it wouldn't matter that much. I tried the aerated concrete beam loadings by turning them into bricks and it worked as my teacher said. As a result, what could be wrong with my system? Node points, analysis settings, etc. Waiting for your help. Thank you. I couldn't load the project, it gave a max 4mb error.
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Hello, In order to be able to make such a comparison, the building model, loads etc. created in the other program. must be exactly the same. As for your project; There does not appear to be a problem with the analysis model. In case your wall loads are selected as bricks and superstructure interactive solution is made, T=1.3 sec. It can be seen that a value such as Note; The building is a 12-storey curtained-framed structure in total... The period of this building is 2 seconds in the other program. It seems more logical to question the situation. Good work
 
I agree with Mr. Levent, the 1st natural vibration period for a 12-storey building seems to be 1.3 seconds, normal, and 2 seconds off. It gets tired that the building rigidity is low and the displacement is high.
 
First of all, thank you for your answers, Mr. Gürkan and Levent. Can we take the moment diagrams as axis while getting the results? That is, the moment diagram of the frame on an axis. Thanks
 
"agure":1esbrqyg" said:
first of all thanks for your answers, Mr. gürkan and levent. Can we get the moment diagrams as axis while getting the results. That is, the moment diagram of the frame on an axis. Thanks
Click to expand...
-Right click in the plan window and select "Vertical frame" -Choose an object or axis. -Select an object or axis. The image in the perspective window will appear as a working plane according to the selected axis. - Right-click on the "Analysis Model" or "Analysis display options" line in the Perspective Window, and in the dialog that opens, click the Frame results tab. select combination and component. This possibility is available in version 8. You can access the demo of version 8 from the link below.
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Thank you teacher. As you said in ide8, I can access diagrams as a vertical frame, which is very nice. But I can't access the displacements as a table. My teacher asked me to graph the displacements in different loading states. I can only see floor displacement as earthquake x earthquake y in the report. Thanks for your help and patience.
 
"agure":wvr81q4d" said:
Thanks, sir. As you said in ide8, I can access the diagrams as vertical frames, it's great. But I can't access the displacements as a table. My teacher asked me to graph the displacements in different loading conditions. Only earthquake x earthquake y floor displacement Thanks for your help and patience.
Click to expand...
Displacements are not given as tables, but displacements of any joint can be seen for the selected loading combination in the Deformation tab in the Analysis Display Options dialog Ux,Uy,Uz, X, Y and vertical respectively denotes displacements in the direction.The default display unit of displacement values is millimeters.
 
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