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Recent content by MathMan

  1. MathMan

    Drycleaning Solvent Information

    Thanks, A very useful link!
  2. MathMan

    Drycleaning Solvent Information

    Does anyone has a quick source for drycleaning solvent information, specifically perchloroethylene? I am trying to classify the chemical in accordance with NFPA 32, but not being a chemist, I'm having a hard time knowing where to look!
  3. MathMan

    Punching Shear

    I have also used Studrails, and spoke at length with the owner of Decon, and his Masters' thesis supervisor at University of Calgary, who "wrote the book" on studrails. Their main advice was that load cases should not be unnecessarily combined. For example, in calculating the...
  4. MathMan

    Working Stress Nail Capacity - Clinched Nails

    Can anyone perhaps email/fax me the appropriate tables out of the latest working stress code for 3-1/2" nails in western spruce/pine/fir, with metal side plate, clinched on the back side, under dry impact loading conditions. Let me know if you can help, and i'll give you my email or fax #...
  5. MathMan

    Changing mindsets

    There is also another possible situation. Your superior could be stuck using old technology because he/she feels most comfortable with it, and feels that changing to new technology will mean the complete loss of the knowledge gained with the old technology. He or she may want to change because...
  6. MathMan

    Nails in Pull-Out

    Thanks for your post I suppose I'll have to live with these values and be more creative in my solutions! I was concerned that perhaps the design resistances were unduly low. But you're right that the conditions for end nailing are more variable than side nailing or toenailing. The low values...
  7. MathMan

    Nails in Pull-Out

    Does anyone know of any empirical values for allowable nail pull-out forces? I am in Alberta, Canada, and the design code we use here is the CSA 086.1-94. There is a section on nails in pull-out, and it says that such a load on a nail can only be used in wind or earthquake design. I don't have...
  8. MathMan

    Press Pit Design

    Have you considered driven sheet piles? They are deep corrugated sheets of thick steel (1/4" to 1/2"). They have high inertia and they interlok at the edges. After they are no longer required, they are removed, and they can be reused, which reduces material costs considerably. Let...
  9. MathMan

    fibermesh reinforced concrete slabs on grade

    I would suggest that you try to locate a handbook called &quot;Concrete Floors on Ground&quot; published by the Portland Cement Association. It goes into great detail on the design of slabs-on-grade.<br><br>In a reference table in this booklet, the maximum control joint spacing is given as...
  10. MathMan

    Pipes/Conduits in concrete slabs

    I am unable to find a rule of thumb for maximum size of pipes running horizontally under the top mat of a flat suspended slab. My first guess would be that anything above 1/5th to 1/4 of the slab depth would cause a shrinkage stress concentration, and hence a weak spot in the slab.<br><br>Anyone...
  11. MathMan

    Pretension in Bolts

    Does anyone know what value of pretension is typically acheived by &quot;turn of nut&quot; method using 3/4&quot;ø A325 bolts?<br><br>I am designing a very lightly loaded clamped connection, and instead of specifying a value for the pre-tension, I would rather (if it is suitable) just note that...
  12. MathMan

    Mouse Customisation

    If the mouse is Logitech brand, software is available from the Logitech web site to customize the mouse buttons. (I think it is called Logitech Mouseware). ACad should be compatible with this software.<br><br><br>Hope this helps.
  13. MathMan

    Concrete Crack Tolerance

    I have read that cracks in water retaining structures should not be more than about 0.01&quot;. However, your problem sounds more severe. The importance of the channel should dictate the relative severity of the cracks.<br><br>I am assuming that the channel is used for storm water run-off, and...
  14. MathMan

    To MBA or not to MBA, that is the question

    I have heard that with the growing number of schools that offer &quot;Master of Business Administration&quot; programs, the quality of the education may not be high enough to warrant doing it.<br><br>My community university offers a two-year joint MBA/MENG program that sounds very interesting...
  15. MathMan

    Program called "Visual Analysis"

    Has anyone ever heard of &quot;Visual Analysis&quot;?<br><br>I have looked for it on the net, and found a couple of obscure references to it, but nothing important. I really need to know something about this program, specifically regarding any limitations that it may have. So if you know...
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