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  1. miecz

    Erie Canal

    Can anyone suggest a book about the construction of the Erie Canal? The books I’ve found focus on the politics, economics, social aspects, and religious aspects.
  2. miecz

    Aluminum I-Beam

    A fabricator has submitted an I12x11.51 as a substitution for an I12x11.7. I can't find properties for an I12x11.51. Can anyone tell me if an I12x11.51 is a standard aluminum shape in North America?
  3. miecz

    Brick Shelf Angles

    I'm posting this question for a friend, who writes: We are working on a 60-feet high building, 4 levels with brick veneer/steel stud wall. The BIA technical notes recommends shelf angles above 30-feet building height, unless the wall is rationally designed. We are pursuing literature...
  4. miecz

    Tank/Retaining Wall Shear

    Article 11.1.3.1 of ACI318 and ACI350 give critical section for concrete shear. This issue came up in a recent thread, thread507-244196, where JedClampett pointed out that, for tanks, the critical section for shear according to Article 11.1.3.1 can be taken at a point "d" from the support for...
  5. miecz

    Embossing Seal

    I've just gotten licensed in New Jersey, where I will need to use an embossing seal. I'm undecided as to whether to purchase a desk model or a pocket (hand) model. I actually own one of each for other states which don't require thier use. The desk model seems clumsy, but I can't imagine...
  6. miecz

    Stud Shear Connectors

    Recent discussion about shear connectors led me to look up their shear strength. I'm a little surprised to find that the nominal strength of a shear connector in 5,000 psi concrete is RgRpAscFu (AISC I3-3), where Fu is the tensile strength of the shear connector. Now, back in ASD days, I used...
  7. miecz

    Graph Titles

    Help! I've forgotten how to change the font for the axes and the title of a 2D plot. Not only that, but I've forgotten where I wrote down the procedure. It's tough getting old.
  8. miecz

    Mathsoft Text

    I'm using version 11 at home and at work. I started using a font called "Mathsoft Text" way back in version 8. I believe this font shipped with earlier versions of Mathcad and is no longer supported. Recently, my home PC contacted a virus and I needed to reinstall everything. In the process...
  9. miecz

    Roarke's Tables for Flat Plates

    I'm working from the 5th Edtion, Table 26 for flat plates, Case 10d for Uniform load decreasing from fixed edge to zero at free edge. There appears to be a typo in the row for [γ]2. The list I have reads: 0.075 0.151 0.211 0.242 0.106 0.199 0.313. Comparing this with other load...
  10. miecz

    Slab on grade for rigid frame buildings

    When using hairpins to transfer frame lateral loads into the slab, how do you handle slab shrinkage? I'm guessing there cannot be any control joints in the slab, and the hairpins tie the slab to the foundation walls.
  11. miecz

    Version 14

    I'm thinking of upgrading from version 11 to version 14, as the price ($245) is attractive. But I'm afraid my version 11 templates won't work in version 14. When I tried to upgrade to version 12, a few years back, many of my old files crashed and needed time consuming debugging to work with...
  12. miecz

    Fiberglass Structurals

    This issue keeps coming back to me: Fiberglass elements in a structure. Recently, we were the EOR for a project where the project manager specified a fiberglass roof for two circular tanks. These were constructed of fiberglass trusses and we were asked to review the shop drawings. At that...
  13. miecz

    Minimum Reinforcing in Concrete Tanks

    In light of the recent discussion of minimum reinforciment of footings according to ACI 318 (thread507-185223) I'm wondering how other tank designers are interpreting the minimum reinforciment provisions for Envorinmental Structures in ACI 350. I'm using the method found in the examples in the...
  14. miecz

    Water Tank Pressure Relief

    I'm designing an in ground concrete tank for a fish hatchery. The water table is high and the tank would need a 54 inch thick mat to resist buoyancy. Is it feasible to use a pressure relief valve for this type of application?
  15. miecz

    2005 AISC Seminar Handout

    About a year ago, I attended an AISC seminar on the 2005 Specification. At this seminar, a booklet was handed out to participants. I'm reviewing the material for composite beams. On sheet 4.16, Example 2, they calculate a Nominal Moment Strength of 1730 ft-kips. I cannot duplicate this...
  16. miecz

    Minimum Reinforcing

    The minimum reinforcing for slabs is governed by ACI 318, Article 7.12, as referenced by 10.5.4. Turning to ACI 350, the same is true, only ACI 350 clarifies this to apply to tank walls, as well as horizontal slabs. Both codes read "the minimum area of tensile reinforcement in the direction of...
  17. miecz

    Aggregate Size

    We are designing Sequencing Batch Reactor tanks per ACI 350. The clear cover from the (#10@6") main reinforcing to the wall face is 2 inches. We have used aggregate grading #67 (3/4") from ASTM C 33 in the past. We're considering going to a larger size such as #57 (1") or 467 (1-1/2") to...
  18. miecz

    leader problem

    We create composite drawings by referencing other files into model space and then creating viewports in paper space. Problem is, some of my leaders get changed in the process, so that the text is not in the same position in the composite drawing as in the referenced file. It seems to happen to...
  19. miecz

    Tension Lap Splice

    I'm often faced with this situation: At the bottom of a tank or retaining wall, I need #10 bars at 10" O.C. At 4 feet above the base mat or footing, I need #8 bars at 10" O.C. So, I'm splicing #8s to #10s. What's the splice length based on, a #8 or a #10? Is there a published solution to...
  20. miecz

    Reinforcement around Slab Openings

    Article 13.4.2 of ACI 318 (and 350) require reinforcement to be added to the sides of an opening equal to the interupted reinforcing. Our standard detail has always called for this reinforcing to extend to the support. However, in the case of a tank wall, the support for the horizontal...

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