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Recent content by OzarkMTBr

  1. OzarkMTBr

    How to Draw a Perpendicular Line to the end of another line

    I use this simple routine in my lisp file: (defun c:1 ()(command &quot;ucs&quot; &quot;ob&quot;)) It sets the '1' as a command for the ucs<object like Exxit's explanation. It is quick and I use this command constantly having to deal with roof pitches (3:12, etc.) The end of the object you...
  2. OzarkMTBr

    AutoCAD 2000 3D Exploded block just disappears!

    What release of autocad are you running? You may check to see that all of your layers are 'on' and that none are 'frozen'. When you explode a block, the objects in the block resort back to their original layers. So if that layer is 'frozen' or 'off', when you explode they will seem to...
  3. OzarkMTBr

    hidden line plots acad 2000

    If you are just wanting the hidden view then you do not need to mess with paper space. Type PLOT, on the 'Plot Settings' screen in the 'Plot Options' area in the lower right corner of the window is a setting called 'Hide objects'. This will hide all items during the plot. If you are using a...
  4. OzarkMTBr

    Reducing number of verticies on a revolved solid?

    John, The vertices are controlled by the resolution of the model at the time of the 3DS export. The FACETRES command sets this resolution. Autocad defaults this setting at <3>. I usually run mine at <0.5>. You can play with the setting to get the desired amount. The side effect of reducing...
  5. OzarkMTBr

    FIRST MOMENT OF INERTIA

    &quot;You might want to be careful about using the principal moments. If the principal axes are not parallel to the X- and Y-axes, the moments about X and Y will be different from those about I and J. For many practical problems (L-shaped members for instance) the principal axes are...
  6. OzarkMTBr

    Self-Tapping Screw Connections

    How did the screws fail? By pullout or did they shear? For pullout there could have been a prying action on the connection. That could develop a greater force than just the wind pulling directly. Just some thoughts. What was the material guage? The pullout will differ from 16Ga to 12Ga.
  7. OzarkMTBr

    IBC Wind Load on a SQUARE Building

    I am not aware of this either. I would be interested in seeing where the Architect obtained this info. Looking in the ASCE 7-98 pg 42-44. The length in not used to obtain the GCp. You use the Effective Wind Area. I did not see any mention of that anomaly. I do not see how a 80'x75' or...
  8. OzarkMTBr

    FIRST MOMENT OF INERTIA

    I use autocad exactly as TLF described it. Once you get the shape created and run the MASSPROP command, It will give you coords to the centroid. I move it by those numbers until the mass properties give the centroid as being 0,0,0. Then it will give you Ixx, Iyy, Radius of Gyration. Below is...
  9. OzarkMTBr

    girt deflection limits

    In the IBC2000 Table 1604.3 subscript 'f' reads: f. The wind load is permitted to be taken as 0.7 times the &quot;component and cladding&quot; loads for the purpose of determining deflection limits herein. Would a girt be considered a 'component'? If it can be, then frames would be designed...
  10. OzarkMTBr

    girt deflection limits

    Thanks for your input, MikeE55, I am currently designing wind to a girt with .75x for deflection and 1.0x for stress. I have been designing wind girts to L/360 in the past because a brick manufacturer suggested that to resist cracking. Above some of the replys to my initial question...
  11. OzarkMTBr

    girt deflection limits

    Thanks for you input, MikeE55, I am currently designing wind to a girt with .75x for deflection and 1.0x for stress. I have been designing wind girts to L/360 in the past because a brick manufacturer suggested that to resist cracking. Above some of the replys to my initial question recommend...
  12. OzarkMTBr

    girt deflection limits

    Thanks for your input and searching. I was not aware of the technical notes on-line that you provided. The SBC does allow for the 75% reduction of wind load. I guess my question was misleading. I was really needing to know if that could be applied to the deflection too. Some of the Code...
  13. OzarkMTBr

    girt deflection limits

    I am curious as to what some of you hold the deflection to an exterior wall girt using the IBC2000 code if the girt was supporting a brittle masonry wall? Also, those familiar with the SBC97, are you allowed to reduce your wind load on said girt above by 0.75? Thanks
  14. OzarkMTBr

    making digital photo's permanent in a drawing

    Pack-n-go is still used for this. It is in the 'Express' pulldown menu. It packs up all the attached files such as images and x-refs needed along with fonts and text/plot files. I get drawings often through email where the title block is missing because they are x-ref'ing them and do not...
  15. OzarkMTBr

    Wide Flange Beam - Web Yielding

    Mill material often varies in strength but must fall above 36ksi. Where the W12 failed and not the W6 could be from varying material strength. Just a possible variable in the puzzle.

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