It should not give an insufficient number of mods error

A

actombo

New Member
Hello, I'm probably making a mistake in my project, but I can't find where or even what I did. It should not give an insufficient number of mods error. The building is separated with a 7 cm joint, including the foundation. When I solve the same structure on a separate ide page, it says the number of modes is insufficient. I would be glad if you could take a look and help.
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Hello, - Since your project is analyzed according to the Earthquake Load Method "Use response spectrum solution with eccentric moment loading on the diaphragm" option, much more modes are needed to ensure sufficient mass participation rate. If the analysis is performed by selecting the "Apply horizontal forces calculated by mode coupling method to rigid diaphragm option", sufficient mass participation rate will be achieved with much less number of modes. The "Ritz vectors" mode calculation method added in version -8 and the "Combination of mode contributions from Element-Specific results" earthquake load method provides sufficient mass participation rate in the lower mode, too. Note: The stair arms on the right block do not connect together. In addition, analysis should be made according to the semi-rigid diaphragm option so that the stairs can be supported on the floors. (In this case, the need for the number of mods will also increase) Good work
 
"Levent Özpak":3kooimln" said:
Hi, -Your project needs more modes to ensure sufficient mass participation ratio, as the analysis is done according to the Seismic Load Method "Use response spectrum solution with eccentric moment loading in the diaphragm" option. If the analysis is made by selecting the "Apply the horizontal forces calculated by the method to the rigid diaphragm option" option, sufficient mass participation rate will be achieved with much fewer modes. With the "Ritz vectors" mode calculation method added in version -8, "Combination of mode contributions from Element-Specific results" is analyzed according to the earthquake load method. In the lower mode, sufficient mass participation rate is provided. Note: The stair arms on the right block are not connected to each other. Also, in order to support the stairs to the floors, analysis should be made according to the semi-rigid diaphragm option (In this case, the need for the number of modes will also increase) Good work
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the project like this Do you mind if I solve it as a whole, Mr. Levent? I cure
 
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