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  1. OlafTheBlack

    mathcad worth it?

    Don't know where you get the BlockPad subscription price of $700. Their site says a professional license for one year is $166 and a permanent professional license for $950. I've been using this program for about two years. I love the way it has textbook formulas that calculate. I really love...
  2. OlafTheBlack

    Designing a single angle

    I assume this is a loose lintel over a window opening. What are you using for loadings? A triangular mass of brick with a base of the window opening and isosceles legs above? The brick beyond will arch over the opening. Usually, the load is too small to get into a highly theoretical analyses...
  3. OlafTheBlack

    Light Gauge Steel Portal Frame ???

    Technically, you can make such a structure. I would expect it to be labor intensive cutting and welding lots of light weight pieces. One drawback is that light gauge metal is thin and easily damaged say from forklifts. Another is the surface to volume ratio of light gauge compared to hot rolled...
  4. OlafTheBlack

    Light Gauge Metal Composite Floors

    To XR250. LIght gauge steel salesmen were promoting cold formed steel in the northeast as non combustible and lightweight and installed by carpenters. Some would push anything to make a sale. I suspect that's where the composite idea cam from as a product competitor to the Hambro system as...
  5. OlafTheBlack

    Light Gauge Metal Composite Floors

    I am working on a wood truss roof replacement. The fire treatment turned the wood brittle. The truss bottom chord is attached to the supported ceiling. Non bearing walls attach directly to the ceiling. Hence, snow loads deflect the truss and pass into the non bearing walls below. These walls are...
  6. OlafTheBlack

    LEED Accreditation for structural engineers

    Today, I got asked if I was LEED Accredited to be on a team for a public building. I have worked with this architect on many projects. I have never been asked the question before. The town made it a reqiuirement that the architect, mechanical engineer, and structural engineer be LEED Accredited...
  7. OlafTheBlack

    Guastavino Floors

    You are indeed correct. A more careful reading while fully awake indicates that's what he meant for L. I knew I would get a good answer here on Eng-Tips. Thanks.
  8. OlafTheBlack

    Guastavino Floors

    I am looking at a an early 1900's Guastavino vaulted floor and arch ribs. Guastavino wrote in his treatise that arch thrusts were calculated for the crown as H = LS/8r where L was the distributed uniform load, S was the arch span, and r was the rise from the arch spring to the crown. Kidder has...
  9. OlafTheBlack

    Testing historic timber for strength

    Check the USDA Wood Handbook. You will see the strength properties of wood ranging by a factor of two. The code allowable stresses factored for safety are based on the low end of the range. Most likely your old building is made from old growth wood having strength from the upper range. You could...
  10. OlafTheBlack

    Seismic Mass Isolation

    Thanks for the response. The bells will be hung from a new carriage, a steel frame. This frame is a substructure within the building primary frame at the belfry level. The bells don't swing. They are struck with whackers put into motion manually by bell ringers. Some of these bells are big...
  11. OlafTheBlack

    Using steel chains as reinforcement??

    A chain carries loads in three ways - axial, shear, and bending of the links. Reinforcing rod carries loads through axial stress only. The rod is stiffer. The masonry is going to move and crack more to get the chain to fully stress, especially if the chain has any slack. Using a chain makes no...
  12. OlafTheBlack

    Seismic Mass Isolation

    I have a project to refit 25 tons of bells in a bell tower, which is to reframe a bell carriage. This steel framed tower was built in the 1930’s before seismic loading was considered a requirement in this locality. I am looking to improve the seismic performance of the bell to tower interaction...

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