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  1. Lazzaroni

    Historic Hollowcore Nomenclature

    I am trying to determine the capacity of existing 6" hollowcore with 2" topping. The existing drawings call it out as '6HS 105AT'. Some are called out with '065AT' or '085AT'. Is the '###AT' a catalog designation? If so, any resources I can reference?
  2. Lazzaroni

    Inclined Headed Stud Anchor Embed

    I am working on an alteration to an existing structure that has the following connection: 10" long structural steel angle with two inclined 1/2"Øx4" long headed studs embedded into the bottom outside corner of a CIP concrete beam . A few seasoned engineers at the office mentioned that there...
  3. Lazzaroni

    Geopiers (stone columns) in SDC D

    ASCE 7-05 12.13.6.2 requires that foundations be interconnected with ties (grade beams) when using piles in SDC D, E, & F and shallow foundations in SDC E & F. The project I'm reviewing is in SDC D and is using geopiers to support shallow foundations. Does a geopier qualify as a pile...
  4. Lazzaroni

    Metal Roof Deck

    Have you tried contacting the Steel Deck Institute (http://www.sdi.org)? They may have historical data.
  5. Lazzaroni

    DCI vs Higher Strength Concrete

    Good afternoon all, I am working on a marine research facility framed with concrete beams and two-way slabs. Concrete mix values were set per ACI: 0.40 max w/c, 5000psi min, increase in rebar cover, etc. I have included a DCI (corrosion inhibiting) admixture for a few research labs that will...
  6. Lazzaroni

    pile caps/tie beams

    Grade beams (tiebeams) are discussed in 1810.3.11 & 1810.3.12 in 2009 IBC. There was no mention of the 10% design value. 1810.2.2 discusses stability requirments for pilecaps. I usually design the GB (stabilizing 1PC & 2PC) for the moment and shear due to piles being out of tolerance
  7. Lazzaroni

    180 vs 90 deg. Hooks in Pilecaps

    Thanks TX...good info.
  8. Lazzaroni

    180 vs 90 deg. Hooks in Pilecaps

    Hello all.....Is there a reason CRSI uses 180 deg. hooks at the bottom of pilecaps? It states, "The provision to include a 180 deg. end hooks or heads on all reinforcing bars in pile caps with single lines of piles around the column is a prudent precaution against a premature "tied-arch" shear...
  9. Lazzaroni

    Winds loads on building with a grating roof

    I am dealing with a similar situtation except I don't have a roof. It is a 4 sided masonry enclosure(40'x40' plan, 18' tall) built on the last floor of a building. The room itself does not have a roof. Same issue....it does not meet the requirements of a partially enclosed or open structure...
  10. Lazzaroni

    0.7 Reduction in C & C Pressures for Deflection Calcs

    I don't know if it's addressed This post may answer some of your questions http://www.eng-tips.com/viewthread.cfm?qid=252378&page=21
  11. Lazzaroni

    0.7 Reduction in C & C Pressures for Deflection Calcs

    I have used it in the past with C&C loading as you described.
  12. Lazzaroni

    Masonry Fireplace/Chimney Design

    Who is responsible for a fireplace/chimney design. There are elements in the design that fall outside of my area of expertise. Are the "guts" (flue liner, damper, etc.) typically designed and detailed by a delegated engineer while I provide the masonry/reinforcing/seismic design requirements?
  13. Lazzaroni

    Stiffness Reduction - Sustained Load

    Can someone clarify the Beta-d factor for reducing the member stiffness due to a sustained lateral load per ACI-05 10.11.1 for a non-sway frame? It states that Beta-d is the ratio of maximum factored axial sustained load to maximum factored axial load associated with same load combo. Is the...
  14. Lazzaroni

    Volunteer Work in Africa

    Thank you all for your input....very infomative and helpful.
  15. Lazzaroni

    Volunteer Work in Africa

    I agree with you, but having seen pictures and speaking with people who have worked building these structures, it is apparent that they are not designed to our standards. The available materials do not appear to meet the quality/tolerances of what I've worked with. My intent is not to come up...
  16. Lazzaroni

    Volunteer Work in Africa

    I am considering volunteering to help design small classrooms and churches in very small villages in Africa. The areas where they will be constructed are very poor and they don't have the money/materials to construct to the codes/standards we have here in the States. Has anyone had experience...

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