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Recent content by r13

  1. r13

    post-tensioning bars

    The linked paper was written by the developers of this innovative technology, that might provide some help other than modeling. Linkhttps://files.engineering.com/getfile.aspx?folder=629be336-ad4d-4546-8c5d-a54c8459a896&file=Earthquake_resilient_steel_braced_frames.pdf
  2. r13

    Slab on Metal Deck Placement - Maximum Allowable Concrete and FL Requirements

    I didn't get deep into this article, but seems it spread the responsibility to maintain a leveled floor to both the designer (engineer) and the contractor. Also, adding concrete does not seem a good idea, as it might cause more problems down the road. Please read on. [link...
  3. r13

    Wind Loads - Interior Pressure Coefficient

    Do you mean wind pressure inside the void space between the concrete and steel panels? Depending on how the steel cladding is attached, but I doubt there will be significant pressure built up inside the panel, except near the edges.
  4. r13

    Frame calculation. How to?

    Josv, Here is a list of schools offer Civil Engineering courses online. You may follow up on schools that offer Mechanical Engineering online study. Link
  5. r13

    50' span trusses (broken bottom chords)

    Below is the CALIFORNIA BUILDING CODE requirements regarding alterations and repairs of the existing structures. I remember either ASCE or IBC has the similar requirements. 3405A.1 General Buildings and structures, and parts thereof, shall be repaired in compliance with Section 3405A and...
  6. r13

    post-tensioning bars

    I'll be silent, but stand by the sideline to learn a new system :) I would rather hear from the OP though.
  7. r13

    Expansion joint spalling

    hokie, Hot, in hand with humid and expansion/contraction could be the poison :)
  8. r13

    post-tensioning bars

    Agent, Do you think posttension in the center of the building is an effective way to eliminate "rocking"?
  9. r13

    post-tensioning bars

    I suspect the compression in the PT bars was mainly caused by the gravity load, so suggested the "test run" to see whether the lateral load case will trigger tension in the PT bars. I have no clue if there is a rocking load or not. But if it does, the uplift should be less than the gravity load...
  10. r13

    Frame calculation. How to?

    I am not looking down on you, but a AA degree just does not provide you with the knowledge required for conducting frame analysis. I admire your willingness to learn, but it is a difficult subject to DIY by reading a few textbooks, or going through a few solved examples. Please consider to...
  11. r13

    post-tensioning bars

    Another way might worth a try. Test run lateral load cases without any gravity load. If still resulted in member compression, it indicates the PT bars are ineffective. Otherwise, the resulting member forces can then be superimposed on the runs with all loadings, but the PT bars deactivated. For...
  12. r13

    Property line eccentric strip footing

    dik, Without agreement, the neighbor might bear 100% responsibility to secure his wall. But it is up to the standard care stipulated in the local building code/ordinance, and/or the lawyers to argue about.
  13. r13

    Expansion joint spalling

    Is the black stuff joint material, or...? The parking is heated or not?
  14. r13

    post-tensioning bars

    Check user manual to see how it specifies "tension only" element, or spring. If it has command available, then your problem is solved by follow the instruction. If only the latter is available, then follow the instruction with equivalent spring constant calculated by k = (EA/L)ELEMENT. Please...
  15. r13

    Steel picture frame in masonry wall - deflection criteria?

    "framing the opening"? Wasn't lintel a frequently seen solution for opening in the existing masonry wall? What is going into/through the opening that require framing?
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