ASCE-07 Section 12.4.2.1 - Determination of QE
ASCE-07 Section 12.4.2.1 - Determination of QE
(OP)
I am trying to figure out my governing load cases for the roof (joists, etc.) of a warehouse I am designing and am getting hung up on the E factor. I just graduated and was never required to determine E in school (it was always a given). I am working my way through the code and am getting hung up on my QE factor. I am stuck here because all of the other factors that I am using in my basic load cases are in units of psf. If I use V or Fp as the code suggests to determine QE, my units are inconsistent (lb vs. psf). How do I translate these factors so I can use them to determine my governing basic load case for roof design?





RE: ASCE-07 Section 12.4.2.1 - Determination of QE
Effects are things like moment, shear, axial tension, etc.
So you obviously don't mix psf with lbs.
You would calculate the applied force on each member (such as your joist) for each load case. These in turn create various effects and you combine them per ASCE 7 in the given load combinations.
RE: ASCE-07 Section 12.4.2.1 - Determination of QE
RE: ASCE-07 Section 12.4.2.1 - Determination of QE
Here's a couple of older posts of similar topic:
thread507-237438: Seismic Load Effects
thread176-98527: ASCE 7-02 Seismic Load effects
thread487-121459: Seismic Load Effect E (IBC 2003)
RE: ASCE-07 Section 12.4.2.1 - Determination of QE
RE: ASCE-07 Section 12.4.2.1 - Determination of QE
RE: ASCE-07 Section 12.4.2.1 - Determination of QE
thread176-98527: ASCE 7-02 Seismic Load effects
(A(dead) + A(live)) + rho x A(seismic) + (0.2)(SDS) x A(dead)
RE: ASCE-07 Section 12.4.2.1 - Determination of QE