MechStruct1
Structural
- Sep 8, 2010
- 15
Hi All,
I have been given separate horizontal and vertical (site-specific) SDS values to use in my static structural analysis. I am using the ASCE 7 ('05 and '10) equations in Section 13.3.1 for calculating a seismic design force. The definition of SDS below those equations says that it is the "spectral acceleration, short period, as determined in Section 11.4.4." My first question is this: Is it appropriate to use the horizontal SDS value I was given with the 13.3-1, 13.3-2, and 13.3-3 equations?
If the answer to the first question is YES, then my second question is this: Is it appropriate to use the VERTICAL SDS value I was given with the concurrent vertical force equation (0.2*SDS*Wp) found a bit later in Section 13.3.1? It seemed reasonable to do that, but I heard from another engineer that the ASCE 7 seismic design force equations (13.3-1 thru 13.3-3) are meant to be used with a single SDS value (not horizontal and vertical values).
If the answer to the second question is YES or NO, then what is the reasoning behind that answer?
Thanks in advance for any insight.
I have been given separate horizontal and vertical (site-specific) SDS values to use in my static structural analysis. I am using the ASCE 7 ('05 and '10) equations in Section 13.3.1 for calculating a seismic design force. The definition of SDS below those equations says that it is the "spectral acceleration, short period, as determined in Section 11.4.4." My first question is this: Is it appropriate to use the horizontal SDS value I was given with the 13.3-1, 13.3-2, and 13.3-3 equations?
If the answer to the first question is YES, then my second question is this: Is it appropriate to use the VERTICAL SDS value I was given with the concurrent vertical force equation (0.2*SDS*Wp) found a bit later in Section 13.3.1? It seemed reasonable to do that, but I heard from another engineer that the ASCE 7 seismic design force equations (13.3-1 thru 13.3-3) are meant to be used with a single SDS value (not horizontal and vertical values).
If the answer to the second question is YES or NO, then what is the reasoning behind that answer?
Thanks in advance for any insight.
