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  1. Trussdoc

    Difference between 1996 BOCA and 1999 BOCA???

    It seems that most states have gone to the International Codes, and the 1999 BOCA is just expensive paper. If you have one, keep it, it may someday be a collectors item!
  2. Trussdoc

    Sill plate question

    As I read it, the initial inquiry was about how the use of a !/2 inch diameter bolt in a 2 x 4 nominal sill plate was justified when the prevailing NDS requires 4 diameters on the loaded side. The use of this connection is grounded in prescriptive code acceptance over a majority of the USA and...
  3. Trussdoc

    Nailing roof trusses to interion non-load-bearing walls

    Truss uplift is the major cause for concern in attaching non-bearing partitions to roof trusses. Even the best designed trusses can undergo uplift if juvenile or compression wood finds its way into the plant that makes them. A SINGLE toenail through the truss bottom chord into the top plate of...
  4. Trussdoc

    Splicing floor trusses via top and bottom 2x4 additions.

    Some suggestions and thoughts... By extending the trusses in the way you describe, it seems you will be losing the triangulation thet the trusses require, at least in the spliced area. You could use plywood/OSB gussets to create a box beam there. The double 2x4 stud wall...will this be at the...
  5. Trussdoc

    Perpendicular bearing on top and bottom wood plates

    Section 2.3.10 of the 1997 NDS allows an increase in the bearing strength when the load is at a distance from the end of the bearing plate. The increase in value is stromgly dependent on the width of the load. For an 1 1/2 inch wide stud, it is 25%.
  6. Trussdoc

    Matching wall and truss spacing...

    If you are using 2x6 studs on this building, which I assume is a single story structure, each stud has a capacity of at least 5000 pounds axial load, or more depending on the grade and species. Placing the studs at 24" on center would allow a total uniform load of about 5000 / 2 x (24/12) /...
  7. Trussdoc

    IMPACT STRENGTH OF STEEL PLATE

    There are a few unknowns here...I'm assuming that occasionally the thing youre testing explodes and creates an overpressure in the surrounding air. One would have to know the total pressure being exerted on the object being tested, then distribute that pressure over the wall and ceiling area of...
  8. Trussdoc

    Sizing Metal Studs For Residential Sheet Rock Ceiling

    http://www.icbo.org/ICBO_ES/Evaluation_Reports/pdf/4943p.pdf may be good for some info on steel joists (as well as studs). The drywall thickness will probably be dictated by fire protection requirements rather than structure. Check with the Gypsum Association http:/www.gypsum.org Their...
  9. Trussdoc

    What organization is the "Authority" in wood construction?

    ...and lets not forget the American Forest and Paper Association, which actually does the preparation of the manuals.... The supply chain of wood products is considerably more complex than for steel or concrete. Hence the alphabet soup of agencies.
  10. Trussdoc

    Corrosion of galvanized plates

    Corrosion resistant coatings for use over truss plates are listed in section 6.5 of ANSI-TPI 1-2003, and include epoxy polyamide, coal tar epoxy, zinc chromate vinyl etc, as well as POST MANUFACTURE hot dipped galvanizing. These are based on research done by some Transportation departments (one...
  11. Trussdoc

    TYPICAL TIMBER SADDLE HANGERS

    With high reactions like that, you have other considerations....such as shear in the supporting beam and significant torsional stresses if the load is unbalanced. I would use a calculation analogous to that used for column base plates on concrete to account for bending in the top flange on wood...
  12. Trussdoc

    TYPICAL TIMBER SADDLE HANGERS

    You would have to consider at least the following factors: 1. Loads a. magnitude b. duration c. direction d. will there be load reversal due to wind load? e. eccentricity 2. Wood a. type of wood will determine strength of connectors b. crushing strength (i.e...
  13. Trussdoc

    Tensile strength of Hickory

    The National Design Specification for Wood Construction (ANSI-AF&PA-NDS)Supplement gives basic design values for a Beech-Birch-Hickory group that include tension parallel to grain. Loading any wood PERPENDICULAR to the grain in tension is not a good idea, because (1) the bond between wood...
  14. Trussdoc

    Very Concerned - I may have underestimated load

    Some 20 years ago, the company I worked for was involved in a major lawsuit over an office building floor. The 20 PSF partition loading was a key issue. Even though the architect had indicated the locations of wood/sheetrock partitions, and their weight was accounted for in the floor truss...
  15. Trussdoc

    "Hybrid" I-beam - ribbed metal web, wood flanges

    try betterheader.com They make a wide range of composite steel/wood headers, and have online load tables
  16. Trussdoc

    Buckling load of a fishing rod

    Seems to me to be a problem best solved by test and experiment....in other words, pack up your rods and bait and go fishin.....
  17. Trussdoc

    replace flitch beam with steel I beam

    For a meaningful answer, we would need: The span of the beam to be replaced the code loading on the roof trusses Constraints on depth, deflection etc. Is this beam at the internal bearing of the roof trusses or in an exterior wall?
  18. Trussdoc

    Truss for softwood

    Continuous bracing such as a roof diaphragm, or closely spaced purlins would dramatically increase the strength of the top chord by reducing the buckling. Also, look at the way that the chords are connected at the truss ends, you may be creating a high shear concentration there.
  19. Trussdoc

    Need Help with Telephone pole design

    Ahh---New Jersey, land of toxic waste and lawyers! A temporary utility pole falling in downtown Newark would create a major catastrophe (or a bonanza, if you're a personal injury lawyer) Hence the conservative approach! The issue of wind loading in NJ has been a bone of contention for a few...
  20. Trussdoc

    Truss uplift -- maybe, maybe not

    Truss uplift, as a documented phenomenon, usually occurs in the first two years of use, before the lumber and moisture levels have time to fully stabilize. A suggestion... check how tight the sheatjing is against the rafters.Gaps could indicate that there was an upward force on the sheathing.

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