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  1. ajh1

    AISC's Reduced Allowables for High b/t ratios

    In AISC 360-16 Section E7 would be applicable for compression loading while Sections F3 through F5 would be applicable for flexure depending upon which elements are deemed slender.
  2. ajh1

    Allowable strength/stress design

    generally speaking you should always be using the latest edition of the standard. There were a number of issues with the older allowable stress design as that standard was not kept up to date for many years until the introduction of the first ASD/LRFD AISC standards. That said, the real...
  3. ajh1

    Turn of the nut, pre-installation verification

    The preinstallation testing is designed to find a method to achieve the required pretension. Table 8.2 in the Specification is a target point for the tension required in the final installation. Preinstallation testing tensions are required to be 5% higher, which might impact your target...
  4. ajh1

    A325 BOLT ASSEMBLY WITH A194 GRADE 7L NUT

    If it's fully exposed, then I would assume that all of the bolts, nuts, etc. should be galvanized, overcoated with a good epoxy paint, or some other means to resolve long-term corrosion issues. I wouldn't anticipate that bolt to nut corrosion would be an issue simply due to the addition of...
  5. ajh1

    A325 BOLT ASSEMBLY WITH A194 GRADE 7L NUT

    The allowance for the swap of A194 2H nuts for A563 DH nuts in RCSC is due to a similar statement in ASTM A563 Table X1.1 Footnote A. The statement given is a question on availability of the A563 DH nuts for 3/4" diameter and larger. Whether that statement is still valid (as I suspect it's been...
  6. ajh1

    Design of nuts as per AISC

    Generally bolts in AISC are going to be either A325 or A490 (now known as ASTM F3125 Grade A325 or Grade A490). These bolts are only available in a heavy hex head. Nuts should be of a similar size, i.e., heavy hex nut. The larger head and nut are necessary to insure the ability to properly...
  7. ajh1

    AISC Design Guide 25

    The DG is basically state-of-the-art when it comes to web tapered design. That said it will probably take a computer program or at least a fairly complicated spreadsheet to properly utilize it. An MBMA task group has begun working with Dr. White on an update / addendum to the guide to address...
  8. ajh1

    maxi. distance between bracing bays in metal bulidings

    Our old rule of thumb was 6 bays apart. The real key is to typically have a braced bay within a bay or two of each endwall to handle the wind loads. Bracing intended primarily for seismic restraint should be spaced relatively uniformly along the length of the building. Bracing for crane...
  9. ajh1

    LRFD (or LSD in canada) versus Allowable STRESS design.

    Excuse the duplicates. When I was typing this in this morning it didn't seem to be registering, so I had tried again, then gave up.
  10. ajh1

    LRFD (or LSD in canada) versus Allowable STRESS design.

    Canada uses the same cold-formed steel design specification as the US. In the US it is referred to as AISI, in Canada S136. The specification is written to cover ASD, LRFD, and LSD and provides safety factors for ASD and separate sets of resistance factors for LRFD and LSD. There are a few...
  11. ajh1

    LRFD (or LSD in canada) versus Allowable STRESS design.

    Canada uses the same cold-formed steel design specification as the US, AISI / CSA S136, with slightly different resistance factors. The specification cites safety factors for ASD and resistance factors individually for LRFD and LSD. The only option in Canada is LSD design, and yes, I chuckle...
  12. ajh1

    LRFD (or LSD in canada) versus Allowable STRESS design.

    I would say, No, you are not at plastic levels. The effect of ASD (without load factors) and LRFD/LSD (with load factors) should give the same basic stress levels in reality in your members. ASD uses a factor of safety, say 1.67, to cover all contingencies over working loads. This is...
  13. ajh1

    LRFD (or LSD in canada) versus Allowable STRESS design.

    Using the AISC Manual it is straight-forward in that all of the equations for capacities are given in a nominal (or ultimate) capacity mode. Simply adjust by either the safety factor (ASD) or the resistance factor (LRFD) to get the actual capacity for the methodology you are using. LSD is...
  14. ajh1

    Tensile Yielding,tensile Rupture

    The other thing to point out is that bolts don't generally have a well-defined yield point. They are specified strictly by their tensile strength.
  15. ajh1

    Washer over long slot hole

    The RCSC rule, and by extension the AISC rule, is that the plate washer must cover the slot regardless of thickness. RCSC Specification Section 6.1.2. Slotted Hole: when a slotted hole occurs in an outer ply, an ASTM F436 washer or 5/16 in. thick common plate washer shall be used as required...
  16. ajh1

    Looking for the 1992 AISC Seismic Provisions

    See Attached File.http://files.engineering.com/getfile.aspx?folder=60e65947-2866-41dc-89a8-340b7751551e&file=AISC_1992_Seismic_Provisions.pdf
  17. ajh1

    slip critical vs bolt strength, single plt conn

    Normally a single plate shear connection would be designed without using a slip-critical method. The intent of a shear connection is that it takes shear only, not moment. If you pretension the bolts to achieve the slip-critical aspect, you are then forcing moment through the joint which it...
  18. ajh1

    AISC design guides

    Design Guides or the example problems? I believe the examples are only available on CD. As indicated, the guides are available for download.
  19. ajh1

    1951 steel joist loading

    Try Perry Green at SJI.
  20. ajh1

    Opinions about the new ASD

    The new spec is referenced by the new IBC 2006 that should come out in early 2006.

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