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  1. LS_SMS

    Can Service Pressure Exceed Design Pressure?

    I'm using ASME, year 2023. In Sec. III and Sec. VIII vessel design, is there ever a situation where the service pressure of a defined load case may exceed the design pressure? For example, if design pressure is 100 psi, can I have a service load case that is defined at 150 psi? Please provide...
  2. LS_SMS

    ASME Sec. VIII, Div. 2, Annex 3-F, Eqn. 8

    Folks, I found another thread HERE about Sec. VIII, Div. 2, Annex 3-F, Eqn. 8. The equation has something wrong with it. That old thread was dated from 2018. In the 2023 version of the Code, the problem still exists. Does anyone have a status update on when they plan to fix this...
  3. LS_SMS

    Applied Acceleration At Boundary Condition

    Folks, I'm using Workbench v2023 to run a Static Structural FEA simulation. I have a simple model and want to apply an acceleration to the model. However, I want the acceleration applied to the boundary condition of the model, instead of the default, which is applying the acceleration to the...
  4. LS_SMS

    Primary Membrane Stress Range for Thermal Stress Ratchet

    Folks, I am looking at 2023 ASME Sec. VIII, Div. 2, Part 5.5.6.3 for the Thermal Stress Ratchet check. This equation is provided... Pm is referred to as "primary membrane stress." Is it supposed to be a primary membrane stress range? Everything in the fatigue and ratchet assessment up to...
  5. LS_SMS

    Sec. VIII Div. 2, Part 5.4 Buckling

    Folks, I am looking at 2023 ASME Sec. VIII, Div. 2, Part 5.4.2 for the Method A Buckling Analysis. I plan to use the ANSYS eigenvalue buckling solver to perform the work. Here are some excerpts from the code... I see a common theme about "assessing individual components." If I have a...
  6. LS_SMS

    Linearized Triaxial Stress Limit

    Folks, I am looking at 2023 ASME Sec. VIII, Div. 2, Part 5.3.2 for the triaxial stress limit. It says... Why do they put the word "linearized" in there? I understand the term's usage in the context of linearized through-wall stress for the checks in Part 5.2.2 (i.e., membrane, bending...
  7. LS_SMS

    Membrane plus Bending At Component Level

    Folks, I am using 2023 ASME Sec. III, Div. 5 for high temperature components. A common theme throughout BPVC is to sum at the component level. For example, Pm + Pb should be summed at the component level for the 6 stress components, before deriving stress intensity to check against the...
  8. LS_SMS

    Archiving a Thread

    Is there a way to archive a thread that I started? I would like to take it out of view for the public, but retain it for my private viewing later.
  9. LS_SMS

    Blodgett Weld Sizing for Atypical Shapes

    I'm familiar with Blodgett and his method to treat welds as a line. And I have looked at his example weld shapes in his manual, of which there are roughly a dozen (image below). But they are all simple typical shapes. My question is how to apply the method to atypical shapes. Below are...
  10. LS_SMS

    Eigenvalue Buckling

    Folks, I just have a high level question about the ANSYS Mechanical Eigenvalue Buckling solver. It has always been my understanding that the Eigenvalue Buckling solver is a low-fidelity first-pass glimpse of a structure's buckling characteristics. In other words, use of the solver should not...
  11. LS_SMS

    Weld Sizing - Blodgett vs. FEA

    Folks, my project is actually a mechanical engineering project, but I think my question might be suited for this structural forum instead. I've not done much weld sizing in my career, but am now deep into Blodgett's Design of Weldments for an overhead crane I'm working on. It has various...
  12. LS_SMS

    ASCE 7-16 Seismic Design for Skid With Nonstructural Components

    I'm on a team of mechanical engineers and we are a little bit out of our wheelhouse. We have taken training for ASCE 7-16 seismic design, so we know the basics. We have been tasked with designing a process piping skid to ASCE 7-16 seismic criteria. We are designing the skid, as well as the...
  13. LS_SMS

    ASCE 7-16_Extracting Enough Modes for Response Spectrum

    I'm reviewing ASCE 7-16 §12.9.1.1 about extracting enough modes for modal response spectrum method. I'm using the ANSYS software which reports mass participation for the three translational directions (UX, UY, UZ) as well as the three rotational directions (ROTX, ROTY, ROTZ). Does §12.9.1.1...
  14. LS_SMS

    USGS/ASCE Web-Based Tool for Seismic Site Classification

    Folks, I'm a mechanical guy dabbling in some civil seismic stuff, meaning I'm out of my wheelhouse a little bit. I'm doing some seismic work with ASCE 7-16. I was told there is a USGS website to get Ss and S1 values for locations around the USA. What is the web address for that site?
  15. LS_SMS

    Nonstructural Components or Nonbuilding Structures, Building Safety Journal

    Folks, as I understand, the ICC publishes the Building Safety Journal. I'm looking for an old article that pertains to ASCE 7: Bachman, R. and Dowty, S. “Nonstructural Components or Nonbuilding Structures?”, Building Safety Journal, April-May, 2008 I searched all over the web but could not...
  16. LS_SMS

    What is Significance of 33Hz in Seismic?

    ***Repost from my earlier thread in Mechanical Engineering. My work actually relates to mechanical engineering, but it didn't occur to me that "structural" would be the more appropriate subforum for this question. My apologies.*** Folks, in many seismic discussions I have had over the years...
  17. LS_SMS

    What is Significance of 33Hz in Seismic?

    Folks, in many seismic discussions I have had over the years, I have frequently heard reference to 33Hz. In terms of seismic, what is the significance of that frequency? Is there some geological reason that seismic vibrations around/above/below that frequency may not matter? Is that a magical...
  18. LS_SMS

    Picking Data From Table of Values

    I'm using Mathcad 8.0. I have the following table of data from a colleague. I want to build this table of data in Mathcad. Then I want to pick from it for downstream calculations. In other words, downstream, if D/2h is specified as 2.8, I want to pick K1 from the table as 1.27. How do I do...
  19. LS_SMS

    ASME Sec. VIII, Div. 1 - Ellipsoidal Head

    Folks, I am looking at 2021 ASME Sec. VIII, Div. 1, UG-32 for ellipsoidal heads. For the calculation of ellipsoidal head thickness, L states to look at Table UG-37 (image below). If I look at Table UG-37 (image below), it does not look like it says anything about L for ellipsoidal heads...
  20. LS_SMS

    Zero Through-Thickness Bending Stress

    Folks, this question relates to ASME stress linearization when being done in ANSYS Mechanical. If I open ASME Sec. VIII, 5-A.4.1.2 and look at Step 2a, it states the bending stresses are only to be included for hoop and normal component stresses. In Mechanical’s post-processing, there is an...

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