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  1. Checkmann

    ASCE-7 Extreme Torsional Irregularity - When to Ignore?

    Deker, that is very interesting! Too bad it will probably be 10 years before we can apply the 2022 ASCE code. Our client is Department of State and we still have to use the 2010 version. Building is overseas but US federal property so we apply Overseas Building Operations code, which is...
  2. Checkmann

    ASCE-7 Extreme Torsional Irregularity - When to Ignore?

    Kookt, That's our feeling as well. We are planning to just add the 1.3 redundancy factor and up-size what we need to. Just wanted to see if other agreed. Modes are as follows: Mode 1 - T= 2.24sec (Y-direction) Mode 2 - T= 1.90sec (X-direction) Mode 3 - T= 1.77 sec (Torsion) HTURKAK, It's...
  3. Checkmann

    ASCE-7 Extreme Torsional Irregularity - When to Ignore?

    Hello all, My colleagues and I want some other structural engineer's opinions on something, specifically Section 12.3.4.2 of ASCE7-10 for buildings with extreme torsional irregularity. It states pretty clearly that any building with an extreme torsional irregularity has to use a redundancy...
  4. Checkmann

    R = 1 seismic systems and their load combinations

    Funny you mention that. Using Chapter 15 was actually one of our first thoughts. But after researching it we concluded that non-building structures can only be used for structures that are unoccupied. Underneath this giant steel canopy is a garden area with outdoor dining, so we don't think it...
  5. Checkmann

    R = 1 seismic systems and their load combinations

    Thanks for the responses everyone. To give you a better idea I made the simple sketch attached. I can't share anything from the drawings as it's a government building. As I tried to show, it's a 4 story concrete building with a steel trellis/canopy structure attached to it's front. The concrete...
  6. Checkmann

    R = 1 seismic systems and their load combinations

    Hello all, I have a very unique structure that I will give a bit of background on below. But what I'd like to know are your thoughts on what seismic load combinations to use when you have a steel structure designed for R = 1.0. Can I set the redundancy factor to 1.0 and thus not increase my...
  7. Checkmann

    P-Delta Preset Analysis in ETABS

    Just to follow up on this. I have had some talks with the engineers at CSI over the last few weeks and they recommend using Iterative Based on Loads and applying 1.2D + 1.0L in the load cases. Or if your live load factor is not 1.0 for your seismic or wind case then apply whatever the load...
  8. Checkmann

    ETABS 18 - Selected element does not highlight

    Interestingly enough the problem went away when I upgraded to the most recent version of ETABS 18.1.1. I hope it doesn't come back...
  9. Checkmann

    P-Delta Preset Analysis in ETABS

    Hi everyone, I have been doing a lot of research but cannot find a solid answer on how to account for P-Delta effects properly in ETABS (big P-Delta, let’s ignore little P-delta in this post). I know there is also a method to add a load case specifically for P-Delta, but I want to look at the...
  10. Checkmann

    ETABS 18 - Selected element does not highlight

    Hi all, A minor thing, but annoying the hell out of me. I just used ETABS Ultimate 18 for the first time and whenever I select a beam the beam does not highlight or change color or anything, so I cannot tell what is selected and what is not. Is there a way to change the view setting so that...

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