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  1. JKW05

    CP60 Coating for Cold Formed Framing

    I have specified a G60 coating for cold formed steel framing at a wastewater treatment plant. The contractor has submitted product data for material with a "CP60 coating" This designation apparently covers galvanized (G60), galvanneal (A60), galvalume (AZ50), and galfan (GF30). My spec...
  2. JKW05

    Lag Screw length

    Good morning. I posted this on the Materials Engineering forum and didn't get many bites. I'm hoping it's O.K. to try to direct traffic to it from here. http://www.eng-tips.com/viewthread.cfm?qid=455116 JKW
  3. JKW05

    Maximum Lag Screw Size Penetrating into 2x Main Member

    Say we're fastening a nominal 2x member to another nominal 2x member with lag screws. 2015 NDS 12.1.4.6: "The minimum length of lag screw penetration, pmin, not including the length of the tapered tip, E, of the lag screw into the main member of single shear connections ... shall be 4D." If a...
  4. JKW05

    Steel Portal Frame Frequency

    I have attached a sketch and calculations for a simple frame which will have a very small impact load applied downward at the mid-span of the beam. The required minimum natural frequency of the structure measured along the vertical axis at the mid-span of the beam is 200 Hz. From the attached...
  5. JKW05

    Lateral Load Level Definition and Height

    ASCE 7 defines hi as the height to Level i, with "i" being the buiding level and i=1 being the first level above the base. The attached file shows three typical building sections (I hope I attached it correctly). Figure A shows an illustration taken from a masonry text book used in an example...
  6. JKW05

    Fiberglass exposed to Ozone

    I have been looking for information regarding the suitability of using fiberglass gratings/railings in a water treatment plant with ozone concentration less than 1 ppm in the air. It seems that understanding the ozone concentration in the information I have been able to find is elusive, and...
  7. JKW05

    Monopole base design (follow-up)

    thread507-340309 This is a follow-up to a post from last March concerning Daniel Horn's technical manual on monopole base designs. On page 56, y1 is define using Ac in the denominator. On page 60, the value for A1 is pluged into the equation. I believe the equation on page 56 should use A1...
  8. JKW05

    New roof sheathing over old?

    50 year-old house with 3/8" plywood sheathing on trusses spaced at 24". Roof shingles are to be replaced. Attic ventilation comprises of a poorly installed ridge vent with no soffit vents. Walking on the roof feels very "spongy". There does not appear to be any roof leaks but, from poking at...
  9. JKW05

    ADA Paper Towel Dispenser

    ANSI 117 specifies that toilet paper dispensers "... shall not be of a type that control delivery, or do not allow continuous paper flow." Does this apply to roll paper towel dispensers, too? Bradley and Bobrick's roll towel dispensers are controlled-delivery. Can they be used in ADA toilet rooms?
  10. JKW05

    Wall Tie or Veneer Anchor?

    ACI 530.1-05 has a section for wall ties (3.4.c) and another section for veneer anchors. The maximum distribution for an adjustable "wall tie" is 1.77 sq. ft. (3.4C-4a); the maximum distribution for an adjustable "veneer anchor" is 2.67 sq. ft.(3.4D-4). What is the difference between a "wall...
  11. JKW05

    Hollow Core Plank Keyways-Cold Weather Grouting

    Does anyone know of any requirements specific to cold-weather grouting for hollow-core plank keyways? I have checked the "PCI Design Handbook for Precast and Prestressed Concrete" and the "PCI Manual for the Design of Hollow Core Slabs" and do not see any requirements in those publications. The...
  12. JKW05

    Fire Rating for Roof Assembly

    Where might one find a tested assembly for a concrete slab or a hollow core plank roof deck with polyiso insulation and EPDM roof membrane (no ceiling). This seems like a pretty basic assembly, but I can't find anything in the UL Classifications. For a plain 6" slab, Table 720.1 (2009 IBC)...
  13. JKW05

    Enercalc

    I am currently using Enercalc 5.8. I'm thinking of upgrading to V6. Any opinions out there on Version 6? Thanks, JKW
  14. JKW05

    Gust Effect Factor Variable

    Re: ASCE 7-05, 6.5.8.2 (Gust effect factor for flexible structures) In determining RsubB using equation 6-13a, "eta" is defined as 4.6*n1*E*B/Vbarsubzbar. I hope this isn't too obvious, but where is "E" defined???? I can't find it in Section 6.3 and it isn't in table 6-2...
  15. JKW05

    IBC Foundation Walls

    2006 IBC 1610.1 specifies foundation walls are to be designed for the design pressures in Table 1610.1 (as a minimum). The exception says active pressures may be used for walls not exceeding 8 feet in height and supporting "flexible" floor systems. Table 1805.5(1) indicates a 12" hollow block...
  16. JKW05

    Appendix D-Abrg

    RE: Appendix D, D.5.3.4: With a headed anchor rod, should Abrg be the gross area of the head (or nut), or should it be the net area of the head (Gross head area minus bolt area). I've been assuming it is the net area....
  17. JKW05

    Precast Water Tanks

    We are considering the use of a precast, post-tensioned water tank in a sewage treatment plant. The tank is approximately 25 feet high and 60 ft diameter. I know many tanks of this type are being used, but my main concern is the number of joints that are necessitated by the precasting operation...
  18. JKW05

    Load Combination for Hydrostatic Uplift

    I have a 20' deep concrete tank, buried 15' into the ground. Flood elevation is 3' above the ground (non-coastal A-zone), what load would be used for determining bouyancy for the tank? ASCE 7-05 2.2 defines H as "load due to lateral earth pressure , ground water pressure or pressure of bulk...
  19. JKW05

    Flat Plate Moments

    No hits on the ACI Code forum, so I thought I would toss this one in here in hopes of some response. ACI 318-05 Section 13.7.7.5: "Distribution of moments ... to column strips, beams, and middle strips as provided in 13.6.4, 13.6.5, and 13.6.6 shall be permitted if the requirement of 13.6.1.6...
  20. JKW05

    Flate Plate Moments

    ACI 318-05 Section 13.7.7.5: "Distribution of moments ... to column strips, beams, and middle strips as provided in 13.6.4, 13.6.5, and 13.6.6 shall be permitted if the requirement of 13.6.1.6 is satisfied." Section 13.6.1.6: "For a panel with beams between supports on all sides, Eq (13-2)...

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