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  1. jeffhed

    CMU Wall Horizontal Section Properties

    JLNJ, We are talking about the average section properties for both hollow and the partially grouted walls. The tables in the NCMA TEK 14-01b state if the mortar bedding is full or just the face shells. I agree that the webs do not count for the walls spanning horizontally. As far as the...
  2. jeffhed

    CMU Wall Horizontal Section Properties

    Hello, I am currently helping a client develop his own masonry block. I have been tasked with developing tables that show the section properties for the block spanning both vertically and horizontally. So for a proof of concept I decided to try to match the wall section properties in NCMA TEK...
  3. jeffhed

    Snow Drift on Lower Roofs from multiple sides

    BAretired, We are in agreement. This is what I have done in the past and was doing on this project. The loads were getting so high on this project (compared to what I normally deal with) that I started to wonder if I wasn't overkilling it. Thank you. jayrod12, Thank you for the link. There...
  4. jeffhed

    Snow Drift on Lower Roofs from multiple sides

    I have a project I am working on with a lower roof that has higher roof on three sides. So I have run three drift calculations. The drifts all overlap each other. Typically I have looked at all of these drifts as one load case occurring at the same time. Is this correct? Or do I actually...
  5. jeffhed

    24VH8 and 20VH7 Open Web Steel joists

    Thank you, Mike. How come those are not in the 75 year joist manual?
  6. jeffhed

    24VH8 and 20VH7 Open Web Steel joists

    I have a project where a client wants to change the use of a space. I have existing floor framing plans that specify the floor joists. The are mostly H joists and I can find load tables for them in the 75 Year Steel Joist Manual. However, two bays are listed as 24VH8 and 20VH7 joists. I...
  7. jeffhed

    Moment Frame and Cantilevered Column Analysis or RISA 3D

    Thank you, Josh.
  8. jeffhed

    Moment Frame and Cantilevered Column Analysis or RISA 3D

    JoshPlum, I understand the subscription thing, I have a subscription for RISA 2D and realize that I would need to purchase a subscription for RISA 3D if I decided to go with it. With RISA 3D, does it actually generate the wind loads, or do I need to generate my own loads with spreadsheets, etc...
  9. jeffhed

    Collector Truss-to-Top Plate Connection / L-Shaped Building

    Jayrod12 is right. Your collector force is 3k at th eend of the shear wall but reduces to zero at the opposite end.
  10. jeffhed

    Moment Frame and Cantilevered Column Analysis or RISA 3D

    I have a project that is an open canopy but has drop shades around the perimeter so it can be an open or an enclosed building. There are existing concrete walls that must remain in place that are in between my transverse frame columns so I don't have a true moment frame in the transverse...
  11. jeffhed

    Wind pressures on structure on top of boat

    SAIL3, I am not sure if a naval architect was used previously, but the new roofing material will not change the profile of the existing structure, the old will be removed and replaced with the new roofing material. I am supposed to be receiving some photos of the existing roof to I can see how...
  12. jeffhed

    Wind pressures on structure on top of boat

    HotRod10, Yes. We are on the same page. If the boat is sitting at the dock it would see the same design wind speed as any building, and I am sure as you have said and as TehMightyEngineer also pointed out that you would never see those kind of wind speeds on the water because you wouldn't take...
  13. jeffhed

    Wind pressures on structure on top of boat

    HotRod10, the highest ground speed you are talking about is a max wind speed that the boat could operate in. Meaning if wind speeds on the water were higher than that wind speed then they boat should not be taken out on the water, right? This is what I have done so far, the boat is a dinner...
  14. jeffhed

    Wind pressures on structure on top of boat

    I have a client who wants to replace the roofing material on a very large tour boat. The structure is a 30'-0" x 30'-0" pole building with corrugated steel roof decking. The decking has aged and needs to be replaced but they need engineering to show that the new roof decking and the attachment...
  15. jeffhed

    SLIDING SNOW

    MotorCity, I also usually think of sliding snow as snow that falls from an upper roof to a lower roof like you said. But couldn't snow slide off of the steeper roof down to the lower flatter roof and accumulate there as well? I can also see how this could be approached as a windward drift load...
  16. jeffhed

    SLIDING SNOW

    Thanks, everyone. I appreciate the input. The sliding snow section is pretty brief. The section mentions a couple times that the snow is sliding from a "higher" roof to a "lower" roof. In this case there really isn't a higher or a lower roof, it's a pitch break in a roof, so I wanted to find...
  17. jeffhed

    SLIDING SNOW

    I have an instance where the roof changes at the back rear wall of the home. The roof slope on the home is a 5:12 and then flattens out to a 3:12 pitch to maintain head height at the back of the covered deck. The deck roof is not "lower" than the main roof, but I have always designed a roof...
  18. jeffhed

    Concrete slab on grade with column loads

    DTGT2002, I don't know that it is 100% clear to me. But I have always looked at a structural slab on ground as a slab that has to transmit building type loads to the soil (by building loads I mean mezzanine column loads, storage rack loads, auto lift loads, etc.) not necessarily a slab that can...
  19. jeffhed

    Concrete slab on grade with column loads

    JAE, I wondered that maybe they were more conservative for that reason also. But when I can support a 7800 lb storage rack load on a 7" slab and in order to support a 4488 ASD load (8129 LRFD) according to ACI 318 I need a 10" thick slab, something doesn't seem right. In order to support a...
  20. jeffhed

    Concrete slab on grade with column loads

    Thank you, Dik. I have a copy of this spreadsheet that I have modified, and it is what I used to get my output in my original post. However, I don't see how this satisfies the requirement that the ACI 318 strength checks be performed when a slab supports building loads. Also, it still doesn't...

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