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Recent content by L775

  1. L775

    Cut Prestressed Concrete DBL-T Joist

    BAretired, the DT was X-rayed in the mid span for the full depth on the DT. The X-rays shoe clearly that all tendons (4 of them) are parallel to each others about 4" to 3" apart and they are straight throughout the DT span as suggested by "StructuralEIT" above. The final question is: Is chipping...
  2. L775

    Cut Prestressed Concrete DBL-T Joist

    Thanks StructuralEIT, based on your comments, which makes sense, cutting the joist is then very possible with little or no side effects... Regards,
  3. L775

    Cut Prestressed Concrete DBL-T Joist

    Thank you all for the insight. I know that for a uniform loading (roof joist) the tendons profile is most likely parabolic. do you think it is also possible that the profile could be harped in a v-shape, enventhough the loading does not have any concentrated load applied? I am asking this...
  4. L775

    Cut Prestressed Concrete DBL-T Joist

    It seams to me that chipping away the joist from its end would make sense as opposed to cutting in in the middle...
  5. L775

    Cut Prestressed Concrete DBL-T Joist

    Hi All, Is it acceptable to cut an existing precast and prestressed double-T concrete joist? The roof joists span about 35 feet. and I need to cut about eight (8) feet off on one end. the newly cut end will be supported on new load bearing and reinforced CMU wall. do you for see a problem...
  6. L775

    SJI unit stresses in 1964

    I appreciate the replies... while I am waiting on the delivery of my book... can you please tell me what would the section size be for the top, bottom and web members of the 16J5 SJI truss produced in 1964 thanks,
  7. L775

    SJI unit stresses in 1964

    What was the unit steel stress, in psi, used in the SJI Standard Specifications for Open Web Steel Joists J-series dating back to the year 1964? I am checking the capacity of an existing roof truss to support additional weight due to replacement of Mechanical roof top units. Thank you for your help.
  8. L775

    Wind Calculations

    Yes, as I said the two buildings are on the same project. They are for the same owner and will be built at the same time on the same lot. Considering the fact that it is not practical to predict the future, the ASCE7 does not allow any considerations of adjacent building shielding and that is...
  9. L775

    Wind Calculations

    Background: Wind load calculations as per ASCE7-02 This is a question related to wind calculations for a project with two adjacent buildings. Both buildings are rectangular in shape. One is 6-story high the other is 3-story high. both are about the same size in plan view. They are next to each...
  10. L775

    Expansion Joint Size

    What is the maximum practical expansion joint size that can be used between a 37-story residential tower and 10-story parking garage building. Deflections at the 10th story are high. thanks,
  11. L775

    Complexity of Engineering

    Codes are only minimum requirements. The EOR is still responsible for his design and plans, regardless whether the code was applied accurately or not, and whether economic objectives were achieved or not.
  12. L775

    Grouted Steel Column

    Dik, Would you please state your sources and/or references on this subject? Thanks again.
  13. L775

    Grouted Steel Column

    Does grouting steel tubes provide additional fire resistance? say 1-hour? Thanks,
  14. L775

    Spill cleanup

    Groneone wrote: " If in the future, additional contamination is discovered, the NFA can be rescinded". 1. How could the discovery come about in a worst case scenario? 2. Wouldn't the monitoring wells be sealed or filled with concrete, after the case is considered closed and an NFA is...
  15. L775

    Spill cleanup

    Please note that it was disclosed to me that through copies of environmental engineer report that the contaminant level are very low and below legal limits. Thanks again,
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