To trash or NOT to trash? Any Use for Supplied Vertical SDS? Or just garbage?

[MechStruct1]

Please see my linked thread below (unanswered) regarding the supplied VERTICAL SDS value for use in a static structural analysis.

[highlight #FCE94F]The main question: Is it good for nothing (with regard to it's use with ASCE 7's static seismic load equations)?[/highlight]

thread507-449338

Thank you!

The key to success is dedication to life-long learning. -Stephen Covey-

 

[dauwerda]

Vertical Response Spectrums that are separate from horizontal were introduced in ASCE 7-16 (Section 11.9). If you are using previous versions of ASCE 7, I don't believe you would have a use for it.

 

[HTURKAK]

My understanding the code for vertical seismic effect is;

- ASCE 7-10 does not specify Vertical Response Spectrum separate from horizontal . ASCE 7-16 (clause 11.9 ) provides procedure for developing a vertical response spectrum.( As pointed by MR.dauwerda ) . IMO, this spectrum is alternate to the 12.4.2.2 . The code explicitly states the use of vertical response spectrum for non-building structures at clause 15.1.4 (Nonbuilding Structures Sensitive to Vertical Ground Motions. Tanks, vessels, hanging structures, and nonbuilding
structures incorporating horizontal cantilevers shall use Section 11.9 to determine the vertical seismic design ground
motion to be applied to the design of the nonbuilding structure)

-For building type structures , the relevant clause is ( 12.4.2.2 Vertical Seismic Load Effect) and
Ev is determined with Eq. (12.4-4a) Ev =0.2XSds X D


- The vertical seismic load effect, Ev, could be taken as zero for the following conditions;
i= for for structures assigned to Seismic Design Category B ,
ii=In Eq. ( E = Eh − Ev ) where determining demands on the soil– structure interface of foundations.


- The code specify vertical seismic load for nonstructural components at clause (13.3) concurrent vertical force ( +,-)0.2 *Sds*Wp.

 

[MechStruct1]

Thank you dauwerda and HTURKAK for your responses! You confirmed my suspicions.

The key to success is dedication to life-long learning. -Stephen Covey-