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  1. DTJ

    Mat model in STAAD

    You have to use REPEAT loads for this analysis in lieu of LOAD COMBINATION. For example if you have a wind only load case then it would not converge since there is no dead load within that case to resist.
  2. DTJ

    ASCE 7 Code question

    For most single story structures you probably will be rigid, but on process towers, open structures etc. you need to look at these individually. I have had braced frame structures because of their height be classified as flexible and end up with Gust factors approaching 1.
  3. DTJ

    Steel Design

    Even though the unbraced lengths may be the same for the different segments, the momnet in those segments is different. STAAD designs each individual member (in STAAD if there are multiple nodes, then it treats these as multiple beams, even though physically it is the same beam)for the moment...
  4. DTJ

    Seismic Site Classification

    To me the question is if the Site Class is a "D" than what is the Seismic Design Category? If going from a Site Class D to a C does not change the Seismic design category, than there is no reason to perform any additional testing. If going from a Site Class D to a C does enable you to lower...
  5. DTJ

    Staad 2006 New Steel Code?

    Be careful with your P-Delta, as Chapter C in the new code requires not only a big P-Delta (Frame Stability) but also a small p-delta (member stability) analysis. While STAAD performs a standard frame stability P-Delta anlayis I am not sure it does the small p-delta.
  6. DTJ

    Modelling an elastomeric bearing

    A pin supported node will wxperience zero translation in the X,Y and Z directions. you would have to use the fixed-but support to release the translation.
  7. DTJ

    CODES FOR STAAD W SECTION

    You don't indiate any load combinations in your input file. D+L? Also note that the DFF command will check deflection for all load cases unless a LOAD LIST command is used to specify only the Live Load Case.
  8. DTJ

    Modal Analysis for Seismic?

    In the September 2003 issue of Structural Engineer, there is an article on Seismic design usig structural dynamics. RAM will do a respose spectra analysis, you may want to check out the help file for that.
  9. DTJ

    ASCE 7 Committee

    Thats seems odd since the SEI website is still offering applications for people to be able to join the committee.
  10. DTJ

    IBC 2003 1605.4 Special Seismic Combinations

    Example 7 of the 2000 IBC Structural/Seismic Design Manual Volume 1 has a similar example. In this particular example they design the columns below the discontinuity for Omega and the collector beams along that line for omega as well.
  11. DTJ

    Combined loads when calculating earthquake lateral loads

    There is a 2004 supplement to the 2003 IBC that allows the use of the 0.75 in conjunction with the 0.7 factor. The supplement can be ordered from the ICC website.
  12. DTJ

    Column Shortening

    In certain situations, in the case of chevron bracing, I design the beam to take the full gravity load. There are some situations where this is a code requirement. (i.e Special Concentrically Braced Frames)
  13. DTJ

    Column Shortening

    Thats what I was getting at. The only problem I have with this is that if the client came back and wanted to relocate the brace later on, the column would not be sufficient to carry all of the gravity loads. In my mind, I always want the columns to have the ability to take the full gravity...
  14. DTJ

    Column Shortening

    I should also clarify, that this only occurs when there are for example, three bays and the bracing works up from the outside to the middle column. The opposing braces prevent rotation from occuring and therefore the result is force in the bracing and the resulting vertical load in the middle...
  15. DTJ

    Column Shortening

    The column is shortening due to the axial load present (Delta=PL/AE). For tall structures, this cumulative shortening from floor to floor could be significant.
  16. DTJ

    Column Shortening

    In performing design of X-braced frame, it is usual to ignore that column shortening will cause compression in the brace member. When performing a computer analysis in STAAD, this load is included in the brace. For a tall heavily loaded structure this could add substantially to the brace...
  17. DTJ

    One Way Support

    Yes this is possible if you define the support as a spring. You can then define it as tension or compression only. There are other modeling requirements so use the online help manual.... Section 5.23.4.
  18. DTJ

    Shielding effect on multi-frame structures

    Use the Wind Loads and Anchor Bolt Design for Petrochemical Facilities which can be ordered from their publications website.
  19. DTJ

    joint(support) in a plate

    If the smaller plate is bearing on the W-shape, then you would want nodes along the entire length of the beam, just make sure there is node at each of your bolt locations. If you are only wanting load (for example eind or seismic) to be transfered at the joint locations, then you will only...
  20. DTJ

    Edit STAAD database?

    You can modify the Section database if you wish. The database is a Microsoft ACCESS file (not sure which version) and you can edit it there, or in STAAD 2005 you can edit the database within the program itself. See link http://www.reiworld.com/Search.asp?id=SP-2839 to add individual sections...

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