Seismic design as per API650
Seismic design as per API650
(OP)
Dear fellows!
Greetings!
please help me out the problem i am facing now.My quesry is about Equation E-4.6.1-1 of API 650, 2013. it says '...However, Ai>= 0.007and for S1> 0.6...Ai> 0.5S1.(I/Rwi)= 0.625Sp(I/Rwi)"
Here, please be noted that i am getting S1 value which is greater than 0.6 and Ai value is greater than 0.007.
Eq.4.6.1-1 yields higher value than Eq.4.6.1-3.
Now please elaborate as when I should use equation E.4.6.1-1 and E.4.6.1-3??
regards
Greetings!
please help me out the problem i am facing now.My quesry is about Equation E-4.6.1-1 of API 650, 2013. it says '...However, Ai>= 0.007and for S1> 0.6...Ai> 0.5S1.(I/Rwi)= 0.625Sp(I/Rwi)"
Here, please be noted that i am getting S1 value which is greater than 0.6 and Ai value is greater than 0.007.
Eq.4.6.1-1 yields higher value than Eq.4.6.1-3.
Now please elaborate as when I should use equation E.4.6.1-1 and E.4.6.1-3??
regards





RE: Seismic design as per API650
Impulsive spectral acceleration parameter, Ai:
[Ai=....] (E.4.6.1-1)
However, Ai ≥ 0.007 (E.4.6.1-2)
and, for S1 ≥ 0.6:
[Ai≥....] (E.4.6.1-3)
I understand that, for all cases, Ai must be the greater of the value calculated by E.4.6.1-1 and 0.007.
For cases when S1≥0.6, Ai must be the greater of the value calculated by E.4.6.1-1 and 0.007 and the value calculated by E.4.6.1-3