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
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.
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.
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
@@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
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
Hey, can you tell me how you create EXN
thank you for watching
EXN=X Dir - Eccentricity (ratio=5%)
EXP=X Dir + Eccentricity (ratio=5%)
What laod combination did you use to get the total factored vertical load sir? thanks
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
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.
Tnx for the breif explanation but why don't we use story drift values directly from the Etabs?
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.
I got it, thank you it help me a lot!!
what does case EXP, EXN are refer to ?
they are (load patterns) defined for linear static analysis to consider eccentricity
So what's the difference between EX AND EXN ?
what is SD4-12 Load Combination consist of Lad Patterns and its Scale Factors???
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
@@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
why are u turn on p delta , u must turn it off when u use drift method (p *drift /v*lu).
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
Except that it is critical that pdelta is off for calculating the stability index as it specifically is based on first-order analysis@@MrEngineerO