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  1. wadavis

    Crane Runway: Lateral torsional buckling with bottom flange support

    With an underslung overhead crane: Does a runway beam have any additional lateral stability from the bridge girder acting as a link to the lightly loaded opposite runway beam? Does this link provide any stability in addition to that already provided by the load being underslung (located below...
  2. wadavis

    Minimum fillet length

    I'm sizing temporary fillet welds for transport loading and want to ensure that I'm accurately calculating the capacity of these short fillet welds. AWS D1 has similar wording. I was concerned that the ends would be weak spots in fillet welds and that short temporary welds would have a...
  3. wadavis

    Piperack Design: Longitudinal Thermal Bracing

    Something from this thread that I wanted to ask about. This piperack structural has longitudinal thermal bracing with breaks every 100ft. What is the purpose of the longitudinal ties? Are these just to prevent bending and deflection in the posts (due to thermal friction)? Or is there more...
  4. wadavis

    Thin Plates for Moment and Torsion connection

    I've avoided these connections out of concern for bolt slip creating a sloped landing (unless they are fayed surfaces). Do you think this is an unwarranted concern? Structural, Alberta
  5. wadavis

    Building a PDF Standards Library

    Any recommendations for Standard (API/CSA) vendors that have reasonable DRM? Over the years our standards library has become littered with PDFs locked to specific computers with no one knowing how to access them. Looking for a better way to do things here. Structural, Alberta
  6. wadavis

    Piperack Design

    We generally consider thermal stresses to be self-relieving: as the wind load increases displacement, the thermal friction load on the rack will decrease/reverse. So we do not considered them combined, with exceptions for stability cases. Structural, Alberta
  7. wadavis

    Shear Flow with a Uniform Moment

    Thanks everyone for the great input. I'm with the phonebook example, as long as there is some way to create even strain where the load is applied (shear flow resistance or rigid clamping) the member wont have a shear flow demand and therefor Ix wont be dependent on it. Bend your phonebook with...
  8. wadavis

    Shear Flow with a Uniform Moment

    That composite behavior vs shear load is what I'm struggling with. When I apply my eccentric tension to the member (triangle load distribution in the above sketch), convert the eccentric load to a Force and Moment at the centroid, and calculate the stress in the extreme fibers (P/A + My/I); I...
  9. wadavis

    Shear Flow with a Uniform Moment

    In my case I have an eccentric axial load applied to a member, that's where the uniform load without shear is coming from. Although VQ/I = 0, the deflection of that member depends on I, the I is different for a composite member than for a bundle of fibers with no shear flow. So there must be a...
  10. wadavis

    Shear Flow with a Uniform Moment

    If a composite member has a uniform moment along it's length (dM=0), how do I calculate the required shear flow capacity between it's bonded components for composite behavior? I understand this is a little academic for these boards, but separating the theory conversation from the application...
  11. wadavis

    Damaged Steel Beam, Top Flange Bent During Install

    Heat straightening, from the picture: 8hr on site, two men with minor equipment and a manlift, apply local rates for one skilled labor and one helper. Source: My time holding the torch. I'm seeing that heat straightening is coming up frequently in this forum, do you guys think there is a demand...
  12. wadavis

    Moving into the bridge industry.

    What surprised you when you started with bridge engineering? What have you found to be standard operating procedure that you didn't expect walking in? I am asking because I am interviewing for a position in a bridge engineering firm, a very different professional community than my current gig...
  13. wadavis

    Skid Platform in Permafrost Environment

    Sorry, this just crossed the limits of my experience. I've only done/seen this in Alberta, not really a seismic zone. Structural E.I.T., Alberta
  14. wadavis

    Skid Platform in Permafrost Environment

    Will your skid be used for transporting the modules and superstructure, or will the skid be in place when the module arrives? Some feedback that applies either way: 1) As others have commented, the foundations tend to be designed on what's available in those regions. 2) The shipping cost on wet...
  15. wadavis

    Buckling Resistance: Rigid lean-on bracing.

    Kootk, Thanks for the reply. Until yesterday I've never heard of the name Vierendeel or seen a truss designed that way. Thanks for the literature references, I've found a lot of material for effective column lengths in braced continuous frames, but nothing yet that tackles sidesway. A response...
  16. wadavis

    Buckling Resistance: Rigid lean-on bracing.

    See the attached screenshot to save us a thousand words. I'm analysing a slender system (guy-wire tower) that is making use of rigid lean-on bracing system to resist buckling. The column to column lateral connections (the 4'x4'x3/4" plates in the screenshot) are stiff enough that I want to...
  17. wadavis

    Stacked Walls Tall Wall

    Not a technical response, but this is relevant reading regarding reviewing tall wall designs produced by others. APEGA Discipline Committee Order Skip to page 94. Wadavis, E.I.T.
  18. wadavis

    estimating residual stress due to cold bending

    Residual stresses in a fully deformed rectangular cross section approach yield along the center line and 50% of yield at the outer extents. But you're aware of the theoretical model, so more on target: Many design codes for applications with high fatigue, or other causes of fracture typically...
  19. wadavis

    Intellectual Property (IP) and creating a portfolio

    Thanks for the input IRstuff, you've made made your point unmistakably clear. I honestly appreciate it. For any future readers, if you are a staff employee you are generally considered by default to be performing Work For Hire under American copyright law. Meaning nothing you produce (including...
  20. wadavis

    Intellectual Property (IP) and creating a portfolio

    When preparing a portfolio of past projects to accompany a personal resume: [ol 1] Which IP belongs to who? Are 3D model shots property of the employer, or copyright of the modeler that produced them? What have I produced belongs to me and can be used without permission? I understand that...

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