Badar (BAZ)

Hi sir, 

May you please explain step 3 for me and how to apply it on ETABS. I have done the Modal analysis and obtained natural frequencies and the corresponding mode shapes. I normalized the mode shapes and ready to apply step 3. 

 

The details of the MADP procedure are expressed as a sequence of the following steps: 

1) Develop a mathematical model of the structure, which incorporates monotonic nonlinear behavior and degradation properties of the structural components.

2) Calculate the natural frequencies, ωn, and the corresponding modeshapes, Φn, through an eigenvalue analysis of the elastic building model. The mode-shapes are normalized so that the roof component of Φn equals unity (Φnr = 1).

3) Compute sn = mΦn, where sn shows the distribution of lateral forces over the height of the building at the first stage of the ‘multistage’ pushover analysis.

I am looking forward to hearing from you. 

Please I need your help sir. 

Kind regards, 

Mohamed