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Turkish Hello, good work, when I enter the value of the ground dominance period to the system from the Analysis settings / TDY options, there is no change in the analysis results. I'm talking about the ground dominance period Z3 ground. Since it is a value between 0.15-0.6, if the construction period is in this range in the regulation, is the analysis results not affected because it already takes S(T)=2.5? Or should I enter the ground dominance period value in another way? ? I hope I was able to explain. good work best regards
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Ground domination period?
- Thread starter cakilomer
- Start date
Ismail Hakki Besler
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If you are analyzing [/b] according to the equivalent earthquake load according to the 1997 and later regulations, the construction period is calculated by making the eigenvalue.Mr. İsmail, thank you for your answer. There is one thing that bothers me. I would like to ask you if I may., Can you explain how the earthquake load in the modal analysis, item 2.8.5, transitions from the convergence to the equivalent earthquake load to the ground dominant period? As you said, this value doesn't actually matter because anyway The regulation takes precaution against the resonance effect, but what I don't understand is that the ground dominant period is related to 2.8.5. Do we use the largest period (of the structure) from the dynamic analysis as the ground dominant period? Best regards
Ismail Hakki Besler
Administrator
If you are doing "dynamic calculation" according to the 1997 and later regulations, after the construction periods are determined with the eigenvalue, the tip forces and displacements are calculated for each mode with an extremely complex algorithm, by taking into account the ground conditions, with a method called "Response Spectrum" and these effects are combined. Articles 2.4 and 2.5 of the Earthquake Code are fully implemented. If you are doing dynamic analysis, all calculated modes are taken into account. If you are calculating using the "Equivalent earthquake load"[/b] method according to the post-1997 regulation. Instead of approximate calculation of the construction period, the eigenvalue is made and the "Building Period" is calculated for the X and Y direction, and again, the appropriate Floor Fs are found.