What is the difference between the response spectrum and the mode coupling method?

[o_berdibek]

Hello, I have defined a new floor for the elevator shaft in a project I am working on, but when I want to analyze it, it says "rigid diaphragm will not be created in the project, the project will be solved by response spectrum analysis method". What is the difference between this method and the mod combination method? So is there any problem in the analysis? Also, I wanted to add the project, I could not upload it because of the file size. Is there any other method to install?

 

[Ismail Hakki Besler]

Instead of the expressions "Response spectrum and mode combining" mentioned here; 7.xx version 8.xx version 7 There are three options in version;[/ u] 1) Apply equivalent horizontal loads to the center of the rigid diaphragm. It is the equivalent earthquake load method. 2) Apply the lateral loads calculated by the mode coupling method to the rigid diaphragm. It is an advanced multi-mode equivalent earthquake load method. The contribution of all modes is taken into account when calculating the Floor F, the contribution of Twisting modes is taken into account. 3) Use response spectrum solution with eccentric moment loading in the diaphragm. Modal Calculation Methods based on the modal behavior of the carrier system under the influence of earthquakes and Mode Combination Methods based on the earthquake spectrum and calculation. There are two options in 8.xx version; 1) Apply Horizontal story forces calculated by combining mode contributions. It is an advanced multimodal equivalent earthquake load method. The contribution of all modes is taken into account when calculating the Floor F, the contribution of Twisting modes is taken into account. 2) Combining the mode contributions from the results specific to the element Modal Calculation Methods, which are based on the modal behavior of the carrier system under the influence of earthquakes, and the Mode Combination Method, which is based on the earthquake spectrum and calculation.