How To Calculate Stability Index θ In ETABS (ACI-19)

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  • เผยแพร่เมื่อ 24 ธ.ค. 2024

ความคิดเห็น • 17

  • @mohamedhasan-rt2tq
    @mohamedhasan-rt2tq 20 วันที่ผ่านมา

    Hey, can you tell me how you create EXN

    • @MrEngineerO
      @MrEngineerO  13 วันที่ผ่านมา

      thank you for watching
      EXN=X Dir - Eccentricity (ratio=5%)
      EXP=X Dir + Eccentricity (ratio=5%)

  • @aroniczpro7013
    @aroniczpro7013 10 หลายเดือนก่อน

    What laod combination did you use to get the total factored vertical load sir? thanks

    • @MrEngineerO
      @MrEngineerO  10 หลายเดือนก่อน +1

      Thank you for your attention:
      we should use the load combination that creates the most axial Factored load:
      1- 1.4D
      2- 1.2D+1.6L+0.5Lroof
      3- 1.2D+1.6L+0.5Snow
      4- 1.2D+L+1.6Lroof
      5- 1.2D+L+1.6Snow
      6- 1.2D+L+0.2Snow+-EXP+-0.3EY+-EZ
      7- 1.2D+L+0.2Snow+-EYP+-0.3EX+-EZ
      8- 0.9D+-EXP+-0.3EY+-EZ
      9- 0.9D+-EYP+-0.3EX+-EZ

  • @mec007
    @mec007 9 หลายเดือนก่อน

    Hola, he notado que la ecuación de Q (índice de estabilidad) haz omitido en el denominador lc, cuál es el motivo, ACI-318 tiene escrito:
    Q=ΣPu*Drift / (ΣV*lc)
    y lo que no estoy muy seguro es cuales deberían de ser la unidades de lc, ACI indica que en mm, pero usando unidades mm Q me da valores demasiados pequeños del orden de exponente -5. Gracias.

  • @MubarekNesru-i4i
    @MubarekNesru-i4i ปีที่แล้ว +1

    Tnx for the breif explanation but why don't we use story drift values directly from the Etabs?

    • @MrEngineerO
      @MrEngineerO  ปีที่แล้ว +2

      Thank you very much for your attention :
      If you extract the ( Diaphragm center of mass displacements/Story height ) You will achieve to Diaphragm center of mass drifts. And by comparing it with the values ​​of story drifts, you will see a difference.
      The diaphragm center of mass drifts should be calculated through by dividing the diaphragm center of mass displacements to story height, Meanwhile, the software
      does not directly provide the center of mass drifts. And the numbers shown in the in the: show tables-joints-displacements-story drifts section, are different from the
      exact method suggested.

    • @MubarekNesru-i4i
      @MubarekNesru-i4i ปีที่แล้ว

      I got it, thank you it help me a lot!!

  • @mujahed5458
    @mujahed5458 ปีที่แล้ว

    what does case EXP, EXN are refer to ?

    • @MrEngineerO
      @MrEngineerO  ปีที่แล้ว

      they are (load patterns) defined for linear static analysis to consider eccentricity

    • @mohamedhasan-rt2tq
      @mohamedhasan-rt2tq 20 วันที่ผ่านมา

      So what's the difference between EX AND EXN ?

  • @akshaythakur54
    @akshaythakur54 ปีที่แล้ว

    what is SD4-12 Load Combination consist of Lad Patterns and its Scale Factors???

    • @MrEngineerO
      @MrEngineerO  ปีที่แล้ว

      Dear engineer thanks for your attention:
      you should choose the load combination that creates the maximum axial force (maximum Pu).
      Also, pay attention to the part shown in the video in Excel for calculation of Stability Index θ, instead of the numbers θ

    • @akshaythakur54
      @akshaythakur54 ปีที่แล้ว

      @@MrEngineerO yes!
      In Concrete Design Code, Gravity Load is (Pu) Factored and in Seismic Check it is (P) Unfactored only
      similar clause in Indian Code IS-456 & IS-16700

  • @MahfouzIbrahim-np6kg
    @MahfouzIbrahim-np6kg ปีที่แล้ว

    why are u turn on p delta , u must turn it off when u use drift method (p *drift /v*lu).

    • @MrEngineerO
      @MrEngineerO  ปีที่แล้ว

      Thank you for your attention, dear engineer. Yes, it should be off, but in this educational video, a comparison has been made so that the difference can be seen

    • @psuengineer84
      @psuengineer84 ปีที่แล้ว

      Except that it is critical that pdelta is off for calculating the stability index as it specifically is based on first-order analysis@@MrEngineerO