Analysis in Time History (Time history)

[ahmetturan]

Hello, I want to see the effects of 1992 Erzincan earthquake by using time definition analysis in the project I am working on. The point where I get stuck is that I get a graph using time definition analysis functions and states, but in transferring and interpreting these graphs to the spectrum, what do the graphs I get mean exactly. I don't know exactly if there is a standard in determining the start and end times in the analysis. Also, while my frequency value does not start from zero, my first period value is zero, is this normal?

 

[HakanŞahin]

Re: Analysis in Time History

Hi I want to see the effects of 1992 Erzincan earthquake by using time history analysis in the project I am working on. I am trying to transfer these graphs to the spectrum and in the interpretation part, what exactly do the graphs I have obtained mean. I don't know if there is a standard for determining the start and end times in time definition analysis

Hello, Conditions to be complied with regarding earthquake ground motions TDY It is given in clauses 2.9.1, 2.9.2 and 2.9.3 2.9.1 Artificial Earthquake Ground Motions In case artificial ground motions are used, at least three earthquake ground motions with the following characteristics will be produced: (a) Duration of strong ground motion part shall not be shorter than 5 times the first natural vibration period of the building and not less than 15 seconds (b) The earthquake ground motion produced The mean of the spectral acceleration values corresponding to the zero period shall not be less than Aog. (c) According to each artificially produced acceleration record, the average of the spectral acceleration values to be found again for the 5% damping ratio, for the periods between 0.2T1 and 2T1 according to the first (dominant) period T1 in the earthquake direction considered, Sae( T) shall not be less than 90% of their elastic spectral acceleration. In case of linear elastic analysis in time domain, spectral acceleration values to be taken as basis to obtain reduced earthquake ground motion will be calculated with Eq.(2.13). 2.9.2. Recorded or Simulated Earthquake Ground Motions Recorded earthquakes or physically simulated ground motions with source and wave propagation properties can be used for earthquake calculation to be made in the time history. Local ground conditions should also be appropriately taken into account when producing such ground motions. If recorded or simulated ground motions are used, at least three earthquake ground motions will be produced and they will satisfy all conditions given in 2.9.1. 2.9.3. Calculation in Time History In the case of non-linear inelastic calculations in time history, internal force-strain relations representing the dynamic behavior of structural system elements under cyclic loads will be defined using the relevant literature, provided that their theoretical and experimental validity has been proven. In linear or non-linear calculations, in case of using three ground motions, the maximum of the results, and in case of using at least seven ground motions, the average of the results will be taken as basis for the design. my value is zero is this normal?[/quote] Period, frequency inverse, records of ground motions should be "time and acceleration" graph or just "acceleration"

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In the program folder (C:\Program Files\ideCAD\ideCAD Static 7\Time history acceleration records ) sample acceleration records, a sample project and a document explaining the subject.

 

[ahmetturan]

Re: Analysis in Time Domain How do I add the elastic spectrum acceleration values that I created into the elastic spectral acceleration values of the erzincan earthquake, is it possible to see this on the graph?

 

[Ismail Hakki Besler]

Re: Analysis in Time Domain

How do I add the elastic spectrum acceleration values that I created into the elastic spectral acceleration values of the erzincan earthquake, is it possible to see this on the graph?

Did you read the document that Hakan sent? Do you know the rules of the earthquake regulation regarding Time history? Do you have general information about time history analysis? Have you done time history analysis with other programs? Why do you include the elastic spectrum acceleration values that you have created into the elastic spectral acceleration values of the erzincan earthquake? If you answer Yes/No to the first four questions and answer the last question as well, the answer I will give you may be the most beneficial for you.

 

[ahmetturan]

Re: Analysis in Time Domain I added 3 time-history functions and time-history conditions. I got the acceleration-time graphs anyway. There is no problem in that part, I am having trouble in the interpretation part. I have already done what is in the document, there is no problem with them. I do not know my next step after obtaining the graphics. I would appreciate it if you could help me in this regard.

 

[Ismail Hakki Besler]

Re: Analysis in Time History

I added 3 time history functions and time history domain conditions, I obtained acceleration-time graphs, there is no problem in that part, I have trouble in interpretation part I am living in a situation like in the attached picture. I have done what is in the document, there is no problem with them anyway. I do not know the next step after obtaining the graphics, I would appreciate it if you could help me in this regard. What would be the result if the Erzincan earthquake had affected my project? quote] The program does not make the comparison you mention.

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document. After importing the verified records into the program, you will analyze in ideCAD. To review the analysis results

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