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Recent content by tobman

  1. tobman

    how do we use the beam selection tables for cantilevers

    SlideRuleEra: I haven't seen the size of your neck, but I would guess that it is quite thick to support such a large brain. My thanks again for clearing up the conditions of "unbraced lengths". I feel very confident in using the checks that I have been using for monorails now, and...
  2. tobman

    how do we use the beam selection tables for cantilevers

    SlideRuleEra: The math all checks out for your example. I even sketched out the deflected shape and I was surprised to see that the bottom flange for a monorail would not be braced for it's entire length. The only problem I'm having now is that it just doesn't seem right. By that I mean that...
  3. tobman

    how do we use the beam selection tables for cantilevers

    SlideRuleEra: Just when you think you're getting the picture........ In one of your replies you said that for an "underslung" beam you would use the whole length of the beam as it's unbraced length. This doesn't make sense to me if the beam is being used as a monorail where the load...
  4. tobman

    how do we use the beam selection tables for cantilevers

    SlideRuleEra: My beam in this case is like load case 22. However, I am asked to put up monorails quite a bit of the time (load case 26) for rigging motors and such. When I do these, I generally use tables put up by the Monorail Manufacturer's Association, using the max load on the monorail...
  5. tobman

    how do we use the beam selection tables for cantilevers

    SlideRuleEra: You have answered my question completely. I was under the impression that the selection tables were only for simply supported conditions, and that the cantilever condition did not apply. This will make this problem a whole bunch easier, as I'm often asked to put up beams here...
  6. tobman

    how do we use the beam selection tables for cantilevers

    ERV: My beam is fixed at one end and is free at the other with a point load on it. There is no lateral support except at the fixed end. Again, my question is:(and to recap: the length of the beam is 10 ft) can I use the beam selection tables, and what would the section be? And if I can't use...
  7. tobman

    how do we use the beam selection tables for cantilevers

    I guess that's what I'm asking. I have my maximum bending moment (5000 lb.ft) from the applied load. Can I then go to the beam selection tables and select a section, and if so what do you use for an unbraced length?
  8. tobman

    how do we use the beam selection tables for cantilevers

    I'm having trouble interpreting what the method of analysis is to determine which steel beam section size to use for a cantilever problem. If I have a beam that is fixed at one end, and has a point load at the other (let's say span of the beam is 10 ft, and the point load is at the end of the...
  9. tobman

    DISSOLVED OXYGEN IN BOILER FEEDWATER

    We have been obtaining higher than desired readings of dissolved oxygen within our boiler feedwater recently. Tests of the level of dissolved O2 in the suction of the boiler feedwater pump is currently 5 parts per billion and at the discharge it is 10 parts per billion. The question is: What...

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