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  1. samdamon

    base scope for a new building- what do you include

    We are having a discussion in the office about what should be included in typical base scope structural engineering services for a new building. For example historically we have not included in our proposals the design or detailing of interior partitions, typical stairs, handrails, or typical...
  2. samdamon

    Weldable nut/ferrule

    Dayton Superior makes a hex shaped coupler, that is of weldable steel, that you might consider
  3. samdamon

    Old wood stress values

    Good article on this topic: "investigating and repairing wood bowstring trusses", by Richard J. Kristie and Arne P. Johnson, February 1996 "Practice periodical on structural design and construction", published by ASCE. The change in wood tension allowables as well as other factors to...
  4. samdamon

    e7014 electrode used instead of specified e7018

    A welder has substituted an e7014 electrode for the specified e7018 (low hydrogen) electrode for welding new A36 steel to existing gr 30 (older) steel. AWS A5.1 shows that the E7014 and E7018 have similar strength properties but the E7014 has no charpy v notch limits, unlike the E7018. Also...
  5. samdamon

    Self-Drilling Screws

    Irene as an alternative you could also use a "self tapping" screw. These require the extra step of predrilling but can be used with thicker pieces and may still can be less costly than field welding. The contractor needs to use the correct, exact predrill bit diameter, as required by the mfgr...
  6. samdamon

    extended end plate moment connection, field welded to column, not bolted

    Thanks for your replies. Yes I am trying to eliminate field CJP. Using an extended end plate (The plate runs several inches above and below the cantilever beam top and bottom flanges) gives me a greater "d" as in "M/d" and eliminates need to stiffen existg column flange. Kootk I thought an end...
  7. samdamon

    extended end plate moment connection, field welded to column, not bolted

    Two questions- First, is anyone aware of research and/or a design method for an extended or flush end plate conn that is welded to the supporting column rather than bolted? The AISC design guides 4 and 16 address only field bolted end plates. I have not found anything further on the web for a...
  8. samdamon

    "correcting" deflection in 100-yr old floors and walls

    Jacking can work, but doing it slowly is key, and as others have noted you will need to stiffen the jacked floors so that they do not simply return to pre-jacked shape after removing shores. You can monitor the force in your jacks with pressure gauges (I have used hydraulic jacks with such...
  9. samdamon

    archaic precast gypsum plank roof deck

    Thank you all for your comments and links, and the engineering humor. Very helpful. Regards
  10. samdamon

    archaic precast gypsum plank roof deck

    I am trying to determine the fire rating and uniform load capacity of an old roof deck system called Pyrobar. Need to replace damaged portion of it on a flat roof of an old building. The roof deck consists of a flat deck of 3" solid Gypsum planks 1' wide and 3' long supported by doubled light...
  11. samdamon

    Old Timber Design Values

    Eric- An article that may be of some use was published in the ASCE Practice Periodical on Structural Design and Construction in Feb 1996 called "Investigating and repairing wood bowstring trusses". Its still available from the ASCE online. The article includes a discussion about how allowable...
  12. samdamon

    metal edge gypsum plank data

    Mike thank you there is some useful info in that thread. I will share the original mars data if I can find it.
  13. samdamon

    metal edge gypsum plank data

    Seeking any span tables or manufacturer's data for this outdated roof deck system. The typical system is 2" thick by 15" wide planks with sheet metal edges. The web says a system like this was made by USG, but no other data available so far. Am evaluating an existing roof that was constructed...
  14. samdamon

    Providing grout space for a two wythe clay masonry wall reinforced vertically

    I am designing a replacement parapet as a 4' vertical cantilever. Architect wants us to use solid clay masonry two wythes thick with hor joint reinforcement. I need to provide vertical rebar reinforcement, centered in the parapet, to resist wind etc. Have heard several different ways to provide...
  15. samdamon

    Existing terra cotta structural properties

    You need a "Brick and Tile Engineering Handbook of Design" book, by Harry C Plummer, published by structural clay products institute. My copy is from 1950 but I beleive there are earlier versions. It has load some load tables and structural data. Regards
  16. samdamon

    evaluating holes in a draped mesh goulash conc slab

    I am reviewing a 1930's era floor in a NY city building that was designed using the empirical formula in the NY code of that time. Having some difficulty deciding how to rationally decide when a hole in the floor of what size needs to be reinforced with steel angles etc under the slab. The mesh...
  17. samdamon

    hot dip galvanized WWR

    Thanks for these comments.
  18. samdamon

    hot dip galvanized WWR

    My understanding is that for hot dip galvanized WWR, the wires are hot dip galvanized per ASTM A 641, but, its done before they are welded into fabric. The welds obviously effect the protection provided by the zinc. I would like to specify that the WWR is hot dip galvanized after the welding...
  19. samdamon

    concrete dowels in shear with smooth slip plane

    Is it feasible to design a doweled connection between new and existing concrete, that is carrying shear, where the plane between the two placements is very smooth? I have an existing condition that is creating this issue. Shear friction concept would not apply since there is little or no...
  20. samdamon

    vertical reinforcing for an 8" thick solid brick parapet

    Dick- Thanks for the very useful comments. Using a slightly wider collar joint will give the minimum grout space for fine grout per the ACI 530 table. If the wall is slightly wider by such a small amount, it probably wont matter architecturally. Regards

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