UBC 1997 earthquake vertical component
UBC 1997 earthquake vertical component
(OP)
Hello
I have one question which is not clear to me,according to UBC ,and based on orthogonality requirement ,do we need to consider the earthquake component in z direction multiplexed by 1.3(30 percent orthogonality, or it just for x and y)
0.5CA*I*D OR 1.3*0.5*CA*I*D
Regards
I have one question which is not clear to me,according to UBC ,and based on orthogonality requirement ,do we need to consider the earthquake component in z direction multiplexed by 1.3(30 percent orthogonality, or it just for x and y)
0.5CA*I*D OR 1.3*0.5*CA*I*D
Regards






RE: UBC 1997 earthquake vertical component
RE: UBC 1997 earthquake vertical component
RE: UBC 1997 earthquake vertical component
when I made the combination for orthogonality
spec x+0.3 spec y only(I don't need to consider directions, since spectrum is both positive and negative)
so on this case does he consider 4 cases??
+-
++
-+
--
Thank you again
RE: UBC 1997 earthquake vertical component
X + .3Y
X -.3Y
-X + .3Y
-X -.3Y
Y + .3X
Y -.3X
-Y + .3X
-Y -.3X
[and remember that within these cases you have cases with different eccentricities]
you get the drill
I'm not sure whether it is applicable under UBC, but it is permitted under ASCE-10 to only do a single orthogonal loading case if you're in a category A or B.
RE: UBC 1997 earthquake vertical component
This under static method ,but for spectrum I don't need to specify negative or positive ,only direction U1 or U2(and he will consider -,+ in Etabs)
I am right??
Thank you
RE: UBC 1997 earthquake vertical component
But using the response spectrum, you're supposed to do each case individually. Here's a youtube video https://www.youtube.com/watch?v=vq_8B2-WRJI
RE: UBC 1997 earthquake vertical component