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  1. tolchijb

    Pole Barn beam sizing

    My state has very specific requirements for "Residential Accessory Post and Beam Structures". This only appears in the residential code and is severely limited in size and height. It is a prescriptive method that will allow you to be code compliant. Beyond that, I tell people if they have a...
  2. tolchijb

    Artificial Intelligence in Structural Engineering

    We human engineers will always have something that AI won't and can't...Professional Liability Insurance. Until AI can be sued and held liable, we will have a job. That said, AI will be an invaluable tool once the marketplace matures. Right now AI is just a buzzword to most without proven...
  3. tolchijb

    In Plane Shear Strength of Unreinforced Masonry Wall

    P/a & Mc/I of the new brick piers is how I would approach it. I would be OK using URBM to resist wind loads, but I would recommend against using it for seismic resistance. The load reversals will break the wall apart after just a few cycles.
  4. tolchijb

    Legal question

    For what it is worth, notifying your insurance will not necessarily result in premium increases. Our insurance wants to be notified and it does not have an effect on our rates until there is a claim. Once we notify the insurance company of a possible claim, they will put the project into loss...
  5. tolchijb

    Shop Drawings, No Calculation Package

    It is not our place to direct or stop construction. That can lead to increase liability based on the way our insurance works. Our work product is our sealed drawings and therefore that is our only means of recourse. In the past I have contacted the AHJ and pulled my stamp from the project in...
  6. tolchijb

    Shop Drawings, No Calculation Package

    I agree with most on here that you have everything to lose and nothing to gain... Maybe I should restate that, your client has everything to gain and nothing to lose. I would insist on the sealed calculations or check every connection yourself. If they will not pay you to check them then insist...
  7. tolchijb

    CFS Delegated Design Legal Framework

    I agree 100%, Jayrod!
  8. tolchijb

    Structural Ridge Splice

    I agree with your assessment if you are looking at this as a pure beam supporting rafters. If you look at the two sloped roofs as plywood beams spanning end to end and leaning on each other at the ridge beam then the splice may work since it is really acting as a tension member and not a true...
  9. tolchijb

    Vehicular Load: 3,000 lbs acting on an area of 4.5 in. by 4.5 in. Distribution Factor?

    This loading is based on someone changing their tire using a bottle jack. Hence the small contact area. I generally use 2 times d (depth to reinforcing steel) plus 4.5" as my effective width, which is a 45 degree shear cone.
  10. tolchijb

    brick veneer cracks

    Based on what I could see I think you have expansion/contraction issues where the brick band above the slider is continuous and the brick to the right of the slider is a relatively short length of masonry. This causes larger expansion/contraction forces in the upper plane than in the brick to...
  11. tolchijb

    Lateral Bending of Colf formed metal studs Boxed headers

    I agree with KootK that torsion in CFM header will be a nightmare. At 25' long I would absolutely go to a hot rolled tube spanning between hot rolled columns that I can use to resist the torsion. If there was not a canopy you would have a chance, but with the canopy you are going to work very...
  12. tolchijb

    Lateral Bending of Colf formed metal studs Boxed headers

    Box headers are typically toe-to-toe unpunched Cee sections with a track top and bottom. I will design the Cee sections to resist the gravity load and the track sections to resist the lateral load.
  13. tolchijb

    pyritic sulfur content in backfill material

    Pyritic sulfur is extremely susceptible to oxidation and will break down into sulfuric acid and secondary sulfate crystals. As long as it is not exposed and there is no oxygen present it remains stable. However, if allowed to oxidize it will increase in volume and can cause so serious heaving...
  14. tolchijb

    New RISA Floor 11 Framing Issues

    I have a structure I designed in RISA Floor 9.0. When we updated to RISA Floor 10.0 the model still ran and solved fine. Now that we have updated to RISA Floor 11 the model will not run. I get a framing error (2049). It says Framing circuit N1-N4 is completely within N40-N45. Nested framing...
  15. tolchijb

    Rivets and Analysis of Historic Structures

    I am curious how easy it is to remove the rivets. I have always been told it is a nightmare because the rivets deform over time.
  16. tolchijb

    Bullet Proof Building Design

    We have done this a few times in our office. The biggest concern was always energy dissipation and ricochet prevention. If you just build a wall perpendicular to the firing line the bullet or shrapnel could bounce back. It was always important to use angles to reduce the energy at final...
  17. tolchijb

    CFS Lateral Bracing

    All valid points, but if the drawings indicate the bridging requirement the contractor should have bid it with the bridging and should install it per the drawings. Unless he is going to pass on the savings to the owner (never happen), you are just helping him increase his profit at the expense...
  18. tolchijb

    Aluminum plate + stainless steel bolts + exterior condition = how much corrosion in one year?

    It is our office standard with aluminum to isolate dissimilar base metals using TPO or mastic and use stainless steel fasteners. I will caution you that galvanized steel base metal and stainless steel fasteners can actually cause the zinc coating of the galvanized steel to be more rapidly...
  19. tolchijb

    Aluminum plate + stainless steel bolts + exterior condition = how much corrosion in one year?

    Per table 2-7 of AISC 14th edition, the corrosion of the base metal (aluminum) is marginally increase by the fastener (Austenitic Stainless Steel: Type 302/304, 303, 305). Note that Martensitic Stainless Steel (Type 410) is not recommended. In my opinion, as long as you are using Austenitic...
  20. tolchijb

    Market Price Comparison between A706/A615 Rebars...

    I cannot speak to price nation wide, but I recently had a project in South Carolina. A706 was available due to SCDOT requiring it on their projects. Costwise the contractor said it would be about $20 extra per truckload, so it was an easy decision versus mixing rebar types on the project.

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