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  1. sticksandtriangles

    Internal Gusset Plate Forces

    I am reviewing Design Guide 29, vertical bracing connections, and was struggling to understand the derivation of the internal gusset plate forces. The images from the design guide are shown below. The force determination on section A-A, I understand and feel comfortable with. I get lost...
  2. sticksandtriangles

    Two Way Shear - vs in Thick Elements

    Recently I was working with some really large loads and trying to deal with punching shear on thick concrete elements. I worked the ACI equations for punching shear and I needed (32) #5, bars, (8) legs*4 sides, at my critical perimeter, at a spacing of 6"oc. Traditional examples of punching...
  3. sticksandtriangles

    ETABs API - Retrieve Auto Seismic Info

    I am trying to retreive auto seismic loading information with the ETABs API. A few problems I am running into. The documentation points to this AutoSeismic.GetASCE716() being available and it would expose a lot of the information I am looking for: The problem is that I do not see this...
  4. sticksandtriangles

    ETABs API Database Tables - Apply Changes While Model is Locked

    I have been trying to make some upgrades to the section cut tool, mainly trying to prevent needless re-runs of the analysis if analysis has already run. In doing this, I have checked to see if results are available, and if they are, I am skipping the run analysis call on the ETABs model...
  5. sticksandtriangles

    Powder Actuated Fasteners to Steel in High Seismic

    Hoping to get some clarity on the use of PAF's in high seismic applications to steel. ASCE 7-16 13.4.5 has this line: PAFs in conc or steel shall not be used for sustained tension loads or brace applications in SDC D,E, or F unless approved for seismic loading (I know of no PAF approved for...
  6. sticksandtriangles

    ACI 318-19 Seismic Shearwall Design - Plastic Analysis to Limit Shear Demand

    Looking at a tall, high seismic concrete tower with the new ACI 318-19. The new equations for design shear strength are as follows: In our specific case, 18.10.3.1 gets capped at 3*Vu, where Vu is the shear that comes from the analysis model. I do not see any specific out in ACI 318-19...
  7. sticksandtriangles

    Point Mapping Algorithms

    I am on the hunt for mapping algorithms to link structural engineering software beams and columns to revit beams and columns. The problem: Often our revit models and engineering models are located at differing points in global space and maybe even rotated. I want to be to map the two models...
  8. sticksandtriangles

    ETABs API Troubles - Section Cut Definition

    Paging Jeremy Atkins, rscassar and maybe JoshPlum since I think he works at CSI. I made a diaphragm section cutting tool in python for ETABs and have documented the process here. The python code worked in ETABs version 19, but does not work in ETABs version 20. I noticed some small tweaks to...
  9. sticksandtriangles

    Column Pedestals - Do Stirrups Need to be Developed?

    We've got a debate in the office if stirrups used to resist a concrete breakout failure plane in typical shear lug need to be developed on both sides of the failure plane in order to be effective. Do the stirrups that do not meet Ldh on the free edge of the failure plane fail to develop Fy...
  10. sticksandtriangles

    Gusset Plate Design

    I am looking for some guidance on the design of the following gusset plate connection on an existing hipped, steel framed roof. It's a pretty complicated little node and steel connection design is definetly not my strong suit. A plan view of what I am trying to do is shown below: How...
  11. sticksandtriangles

    Mathcad 15, Gone?

    The IT guy just informed me that the latest update from PTC did not include the standard mathcad 15 license key. We have a question out to PTC if this is intentional or a mistake, but I fear for the worst. Anyone have insight into this? I've dreaded the day the Mathcad 15 is gone and it maybe...
  12. sticksandtriangles

    Generating PM Diagrams for Concrete

    I am attempting to generate a concrete PM diagram tool and I am running into an odd bug, I am hoping someone can point me in the right direction. A quick summary of where I am at, I have tool that allows the user to place concrete shapes and rebar on the screen. After the user input is...
  13. sticksandtriangles

    Legal Terms for Engineering Calculations

    I am looking for some guidance from fellow coders with engineering calculations on their webpages, what sort of legal jargon do I need to cover myself? I know none of you are lawyers and will probably recommend I talk to a lawyer, which I will if required, but is there some open source legal...
  14. sticksandtriangles

    2d Polygon Meshing Algorithm References

    I am looking for a good text book/resource on finite element meshing algorithms. If you have any experience in this realm, I would appreciate some guidance on potential pitfalls/things to look out for regarding these algorithms. Ideally the algorithm would be able to accommodate 2-d polygons...
  15. sticksandtriangles

    Material Testing - Rebar

    I have a project where ASCE 41 requires material testing of rebar on an existing building. After researching what ASTM specs this testing should follow, I have found ASTM spec A370 and ASTM A615 (which points back to A370 for material testing procedures) to govern this testing. Reading A370...
  16. sticksandtriangles

    Steel Brace Fabrication Error Question

    I have a condition where due to a fabrication error, a very heavily loaded brace now has a 1" gap between the typical flange plate connection and the brace itself. The contractor is asking us if a shim plate can be used to fill the 1" gap (see red shim plate) to prevent ripping it out and...
  17. sticksandtriangles

    Welding Near Existing Wood - Possible?

    I have a retrofit project where I want to weld near some existing wood (existing tongue and groove deck and wood beams). Sample detail: Is this possible without starting a big fire? Will my contractor laugh at me? S&T - www.re-tug.com
  18. sticksandtriangles

    CAD type interface with Web Application

    This maybe a long shot, but I figured I would ask anyways. I have built my website in python using Django and have my blog up and running. I now want to dabble in adding some calculations to my website and one of the capabilities I am going to need is a CAD type interface to allow me and users...
  19. sticksandtriangles

    Seismic Design - Penthouses

    I have a (4) story building with a sizeable and tall "penthouse" on top. The main building lateral system is special steel moment frames and the penthouse lateral system is braced frames designed through ASCE 7, chapter 13, Fp forces. What do I take as my structure height? The roof elevation...
  20. sticksandtriangles

    Coupled Concrete Shear Wall Design Questions

    The recent concrete wall questions in this forum have got me thinking a lot about concrete shear wall design. A few questions for the group: 1. How does designing wall elements as individual pier elements verse designing a whole section affect DCR ratios and overall design capacities? I ran...

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