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  1. 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...
  2. 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.
  3. 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...
  4. 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,
  5. L775

    Grouted Steel Column

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

    Spill cleanup

    Hi, This question is related to case is Dade County, Florida. A spill of contaminant from a dry cleaner is being monitored with minitoring wells for the last 2 to 2.5 years. the DERM is expected to issue what is called an MOP (Monitoring Only Plan)and after that a NFA (No Further Action). 1...
  7. L775

    PT Slab

    The PT slab in question is a parking deck and a roof for a parking garage building. the top of the slab has high and low point elevations. low point being at the drain location and high point half way between drains at 5" higher than the low point. the slab thickness is 8" at the drain so that...
  8. L775

    Inspection Fees

    Threshold inspect fees for a large threshold commercial building in South Florida, (without any drawings). Project involves pilecaps, reinforced concrete columns shearwalls, post-tensioned concrete slabs, and reinforced masonry... What would you think is a resonable estimate for the lump sum...
  9. L775

    Engineer with foreign degree

    An individual who has an engineering degree and experience outside USA. He does not have an EIT certificate. Can this structural engineer be employed to work in Florida under the supervision of a registered Florida PE? Thanks,
  10. L775

    45 story tower crane attachement to concrete building

    Should the assembly that hold the tower crane strut attachment to a concrete slab be anchored to the concrete slab with double embed steel plates (both sides of slab) with thru bolts installed before casting concrete? Or should it be anchored to the concrete slab with steel plates (on both...
  11. L775

    Corner or Interior Column?

    A corner rectangular column in a multi-story building with 8" P/T floor slabs is being analyzed for punching shear. The column has overhangs on the outside in x and y directions in a plan view. Question: How much of an overhang or a cantilevered slab length should be provided so that the column...
  12. L775

    Pour Strip

    When should a pour strip be required in a post tensioned concrete slab? (8" thick elevated slab in residential building) just to give an example; say the slab is 298' long x 75' wide or 365' long x 75' wide. what is the average practical slab length that will not require a pour strip? Thank...
  13. L775

    Compressible Material

    We have an existing post-tensioned concrete deck that we are building on top of it a 5-foot-deep swimming pool with 12" thick slab. We are proposing a 2" or 3" GAP between the bottom of the 12" slab of the swimming pool and the top of the existing concrete deck. As usual we are taking all...
  14. L775

    Available Steel Sections

    How do I check the availability of the latest steel W-Sections? What is the best most current resource on the net? Thank you,
  15. L775

    VB-ITERATION

    How do I stop AN iteration when it reaches the end of a group of occupied cells filled with the IDENTICAL text (i.e. B277) in a column? I want it to stop at the end of the list. HOW does it know that the next cell is empty so it will not error or use an empty cell. the length of the list in a...
  16. L775

    slab punshing shear and steel cap plate

    will the punching shear in a concrete slab supported by a steel cap plate be reduced if the cap plate edges were chamfered 45 degress? the chamfering will provide a transition in the slab thickness from say 7.25 above the plate to a full slab thickness of 8.0 in. the cap plate thickness being...
  17. L775

    tremie slab/foundation

    we are building a 17 story building with 2 story underground parking. the average water table elevation is at +/-12' above the proposed top of foundation elevation. what is the best scheme the foundation system in a condition as this. what is the interaction between the tremie slab and the...

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