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  1. MagicFarmer

    Using Split Rings in a Laminated Wood Deck

    Good afternoon, I am dealing with a pretty unique situation and it seems that the use of split rings is my only option. In CSA O86, the "J" factors for split ring capacity deal with end/edge distances. If I am looking to install a 4" split ring in a vertically nail laminated 38x140 deck face...
  2. MagicFarmer

    Nosing Angle Nelson Stud Design

    Good afternoon, I am in the process of reviewing some drawings for a bridge abutment repair/rehab. The front edge of the abutment back wall has a steel nosing angle, which attaches to the concrete via alternating (vertical/horizontal) nelson studs. Does anyone know of a design criteria for...
  3. MagicFarmer

    Fatigue Analysis of Slip Critical Bolted Gusset Plates

    Good afternoon, I can't seem to find any literature on the fatigue analysis of bolted, slip critical gusset plates. My initial assumption was that I would be comparing the stress calculated at both the Whitmore Section and the Block Shear failure plane and compare it against the category B...
  4. MagicFarmer

    Warping Constant of Back to Back Channels

    So quite some time ago @tennist had a post asking for help calculating the Warping Constant (Cw) of back to back channels: https://www.eng-tips.com/viewthread.cfm?qid=367554 I have used the equation cited, but also compared it to the formula out of Roark's Formulas for Stress and Strain...
  5. MagicFarmer

    Shear Shape Factor

    Good morning, I am currently working through the analysis of a series of laced/battened columns. I am using: Guide to Stability Design Criteria for Metal Structures - Galambos Behavior of Laced and Battened Structural Members - Lin et. al. 1970 Both the book and the paper utilize a Shear Shape...
  6. MagicFarmer

    Why is shear not checked for vertically laminated wood bridge decks?

    Good afternoon, I'm plugging away on the design of a nail-laminated wood bridge deck today and have come across two clauses that state that shear need not be checked for vertically laminated wood decks. From CSA S6: "Cl.5.5.8 Transverse wood deck Only the transverse moment need be analyzed...
  7. MagicFarmer

    CSA S6 Butt Joint Stiffness Factor

    Good morning, I am working on the design of a nail-laminated bridge deck and don't understand the Butt Joint Stiffness Factor, kb. kb = (Nb - 1)/Nb Where "Nb = a measure of the frequency of butt joints in laminated wood decks, being for any 1.0 m wide band perpendicular to the laminates, the...
  8. MagicFarmer

    Change in Wood Density and Dimension as the Result of a Change in Moisture Content

    Good afternoon, I am currently looking at a nail laminated bridge deck with 2x longitudinal running boards as a wearing surface. I have already calculated the shrinkage/swelling of the deck due to changes in relative humidity. The total deck (~42m) will experience a dimensional change of...
  9. MagicFarmer

    Mode Shapes and Mass Participation

    I Posted this on the mechanical forum as well but thought I'd move the post over here... Good morning, I am starting to get into structural modelling for seismic and vibration design. I have had difficult time understanding and visualizing the concepts of mode shapes, period, and mass...
  10. MagicFarmer

    Navigating the Complexities of Historic Structures

    Good afternoon, I have found myself in yet another interesting place in the world of structural design. I recently have been assigned the superstructure replacement and substructure re-rehabilitation of a historic structure. I have been reading all of the associated documentation and have come...
  11. MagicFarmer

    Resources for a New Bridge Engineer

    Good afternoon, For the past four years I have been working in consulting designing building structures. I received my P.Eng. designation last year. I have just accepted a new position as a bridge engineer and am reaching out to ask if anyone can point me in towards any great Canadian (Ontario)...
  12. MagicFarmer

    Eccentrically Loaded Footing Design Question

    Good afternoon, I am working through an eccentrically loaded footing problem and have some questions. In Reinforced Concrete - Mechanics and Design (MacGregor and Bartlett), the book states: "For the structural design of eccentrically loaded footings such as those for retaining walls or...
  13. MagicFarmer

    Structural Engineering Diaphragm/Shearwall Book Recommendations

    Good morning, I've been in the process of building my library lately. In anticipation of a couple of upcoming jobs that will have non-orthogonal irregularities for lateral restraint, I picked up a copy of "The Analysis of Irregular Shaped Structures" (Malone/Rice). Although the book is...
  14. MagicFarmer

    Integrity Steel in Two Way Slabs

    I am currently working on the design of a two way slab. I have been using spSlab (Structure Point) for this. I am currently reviewing the design output for integrity steel at the columns and the numbers are very high. I discovered that the program is including the service loads from the steel...
  15. MagicFarmer

    Contractor Error Introduced Sweep in Steel Beam

    Good afternoon, I am currently reviewing a construction deficiency and was hoping for some additional guidance. The contractor has installed a heavy W760 that spans ~8.0 m and has introduced a sweep in the top flange of approximately 25-50 mm and has installed the precast concrete floor. This...

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