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  1. Qrs

    Strengthening Open Web Steel Joists

    When you are strengthening an existing joist, all references say that “forces are distributed between existing member and the reinforcing member in direct proportion to their area”. This is in the “Designing with Vulcraft” document as well as the paper “Strengthening Open Web Steel Joists” by...
  2. Qrs

    Allowable bending stress of coped beam seat

    I was reviewing how to designed a coped beam seat for a beam and was following the example in the “designing with vulcraft” 2nd edition manual. When determining the bending capacity of the bottom plate (of the seat), they using an allowable stress of 0.75Fy. When determining the bending...
  3. Qrs

    Masonry Section Properites Horizontal Span

    Good afternoon! (for some of us) Has anyone been able to recreate the section properties of a hollow masonry wall (spanning horizontally, no grout, face shell) as shown in many books/TEK publications? I am creating a spreadsheet and all of my section properties have matched these documents...
  4. Qrs

    Unreinforced Masonry Shear

    I am looking at the out-of-plane shear strength of an unreinforced masonry wall. My masonry code tells me the formula for the shear load applied is fv=(V*Q)/(In*b) and I understand this is the basic mechanics formula for the parabolic shear. My question would be how do I figure out the Q for my...
  5. Qrs

    Shear Capacity of Dowels in Masonry Wall

    How do you determine the shear capacity of dowels in a masonry wall? Let's say I have a 10' cantilever wall in a seismic area (so i cannot rely on friction for shear resistance.) How do I determine the capacity of the rebar dowels at the interface between the masonry wall and the concrete slab...
  6. Qrs

    Lateral Torsional Buckling

    Will lateral torsional buckling ever control the stress in the tension flange of a singly symmetric member? Lets say I have a wideflange with a channel on top. The top flange will only be in compression and the bottom flange will only be in tension. (uniform loading, single span.) I am checking...
  7. Qrs

    Cleaning Belled Piers

    How are the bells in belled piers cleaned out? I saw a patent for a belling tool that collects and removes the dirt as it drills. Is this typical? Or is the loose dirt removed by hand? (people and buckets?) I'm new to belled piers and want to learn what the typical practice is. [ponder]
  8. Qrs

    Given Crane Maximum Wheel Load

    Hello community. I am curious.. I have done quite a few bridge crane girder designs. Typically, I will receive a preliminary "cut sheet" of the crane that supplies the information I need (wheel base dimension, bridge weight, cmaa classification, etc.) Typically, the max wheel load in included...
  9. Qrs

    Rebar Vs Deformed Bar Anchor

    Excuse me if this is a dumb question, but what are the main differences between rebar (ASTM 615) and deformed bar anchors (A496). Is it a difference in material? size? deformation standards? It seems to me that these can be used interchangeably in design, is that correct? When would someone...
  10. Qrs

    Grade Beam

    I have a grade beam supporting a new masonry wall. The grade beam spans 20ft between helical piers. Obviously, I have designed the grade beam to support the vertical load from the wall, but does it also need to be sized for 1/2 the wind load (or seismic out of plane force) on the wall? The...

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