Vertical Seismic Load

[Alireza.Kord]

HELLO!

I want to create vertical seismic load in equivalent lateral force method, depend on AISC 7-10

Ev=0.2*Sds*D

and then load combination change to

(1.2 + 0.2Sds)D + ρQE + L + 0.2S

(0.9 – 0.2Sds)D + ρQE + 1.6H

so 

if Sds=1.05

then

(1.41)D + ρQE + L + 0.2S

(0.69)D + ρQE + 1.6H

now my question is how robot can create load combination included vertical seismic load automatically (because of using DAM analysis method and a lot of load combination I don’t want to create all load combination manually)

P.S.

can’t use load case coefficient in full automatic combination menu because of 2 different factors for dead load

MANY THANKS

[Alireza.Kord]

BUMP!

no idea for Vertical Seismic Load! 

[Artur.Kosakowski]

I'm sorry but my knowledge of US code is not good enough to correctly understand the situation. First of all could you point me to teh reference in the code which describes the rules for: 

vertical seismic load in equivalent lateral force method, depend on AISC 7-10

Ev=0.2*Sds*D

and then the part that covers generation of combinations:

(1.2 + 0.2Sds)D + ρQE + L + 0.2S

(0.9 – 0.2Sds)D + ρQE + 1.6H

so 

if Sds=1.05

then

(1.41)D + ρQE + L + 0.2S

(0.69)D + ρQE + 1.6H

Thank you.

[Alireza.Kord]

I attached the page is related to it in post no2

Its Page 86 Section 12.4.2.2 (Vertical Seismic Load Effect) and 12.4.2.3 (Seismic Load Combinations) of Chapter 12 (SEISMIC DESIGN REQUIREMENTS FOR BUILDING STRUCTURES) in ASCE 7-10

thanks in advance

[Alireza.Kord]

BUMP

Really!!!

Robot cant generates load combinations according to ASCE for a seismic region automatically and I have to create 100 load combinations manually

[mustafahesenow · Accepted solution]

1

[structural.engineer79]

Not clear