Earthquake Load and beta Coefficient

[ce.mesutergul]

Hello, I am doing a thesis that compares IdeCAD-Etabs-Sta4CAD in every aspect. I have a question about idecad. I would be very happy if you could help: As you know, if at least one of the A1, B2 or B3 type irregularities is present in the building, beta=0.90, otherwise beta=0.80. I see that the beta value we entered manually in Sta4CAD is automatically 0.9 in IdeCAD. I could not manually change this value. Moreover, despite the beta value of 0.9 and the mod combination/equivalent ratio of 0.79, I saw that no correction was made with this beta coefficient in the analysis reports. What is the explanation for this?

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Good work

 

[HakanŞahin]

Hello,

I see that 0.9 is automatically received in İdeCAD

According to the 1st report you added, there are no A1, B2 or B3 irregularities. Therefore, beta=0.8. If you look at the 3rd report you added Beta value is 0.8.

I could not change this value manually.

The program does not allow to change beta coefficient because it is a regulation sanction. Beta coefficient is taken in accordance with the regulation.

. Moreover, despite the beta value of 0.9 and the mod combination/equivalent ratio of 0.79, I saw that no correction was made with this beta coefficient in the analysis reports. What is the explanation for this?

[ b]Vt-x = 265.81 tf VtB -X = 210.84 tf beta=0.8[/b] x direction amplification factor = 0.8* 265.81 / 210.84 = 1.01 Vt-y = 265.81 tf VtB -Y = 207.26 tf beta=0.8 y direction enlargement factor = 0.8* 265.81 / 207.26 = 1.03 Correction is made. All are visible in the report you attached. Magnification coefficients are applied before the reinforced concrete design in the element end forces. For example If you look at the column reinforced concrete, you can see the raw and design results separately.The design results are augmented values.

 

[ce.mesutergul]

thanks for your answer. beta was 0.9 in the first results. Then it got better, I didn't notice. So there is no beta correction for earthquake forces shown as "selected"? So how can I see the total (beta corrected) earthquake force? do i have to bump it myself to see this?

 

[HakanŞahin]

thanks for your answer. beta was 0.9 in the first results. then it got better, I didn't notice. beta correction is not done in the earthquake forces shown as "selected" so how can I see the total (beta corrected) earthquake force? ? Do I have to multiply it myself to see it?

In the relevant article of the regulation, it is written that "all internal forces and displacement forces" will be multiplied by the beta coefficient. The program applies this. The earthquake forces given in the report are raw, that is, unmultiplied values. From these, the extreme forces are calculated. Then, multiplying with the magnification factor that appears in the report, those extreme forces are enlarged and used in the design. I write in detail what the program did, so that it can shed light on your thesis work. Accordingly, to answer your question, yes, the earthquake forces written in the selected one are unmultiplied values. If you want to get the multiplied value, you can multiply it yourself.