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Recent content by tslewis

  1. tslewis

    Imrpove Speed when running a VBA solution in catia

    Does anyone have any advice as to how to speed up the processing time when running a custom vba code to interact with catia form excel say. (Im not referring to catScript). For instance,when instantiating power copies or point features, my code can take more than 3 hours because I cannot...
  2. tslewis

    Non VBA Means of Exporting Point Co-ordinate and Line Data to Excel

    Um, I dont understand your point. I want to be able to use the data I see in the CATIA environment. If a line is created from a Point A and Point B I want to be able to use the same point (node) labels when re-creating the line element when post-processing the data for use in a structural...
  3. tslewis

    Non VBA Means of Exporting Point Co-ordinate and Line Data to Excel

    Guys thanks for the response. I had thought of saving to an IGES file and using some code to extract the node co-ordinates and line node connectivity data to Excel - typpcailly I write code in MathCAD, read in teh file and export it to another file format. However, I wanted to explore ways of...
  4. tslewis

    Non VBA Means of Exporting Point Co-ordinate and Line Data to Excel

    Thanks but that isnot an answer to my question. I need the connectivity node data for a line element. I am amazed taht is a difficult thing to do. Is this a hidden attribute fora line element?
  5. tslewis

    Non VBA Means of Exporting Point Co-ordinate and Line Data to Excel

    I am trying to export point and line data using a design sheet. I want to recreate the wire-frame geometry from a series of points and lines defined in CATIA. I am amazed how difficult this seems to be. I understand that I can export the point data i.e point number and X Y and Z co-ordinate...
  6. tslewis

    Stainless Steel/Carbon Steel Bolt Tension Capacity Inconsistency

    Not sure. The equaitons for ASD and LRFD are both based on teh ultimate strength of the material. There are additional ASD and LRFD equations for Yielding in teh gross area of a tension memnber.
  7. tslewis

    Stainless Steel/Carbon Steel Bolt Tension Capacity Inconsistency

    Does any ome know why the calculations for the LRFD capaacity of a stainless steel bolt (ASCE 8-02) and carbon steel bolt (AISC 2005 Steel Building Specifications) is identical. But the calculations for the ASD capacity is significantly different from the ASCE and AISC Codes. The ASD factor fo...
  8. tslewis

    Tension Rod Capacity

    Yes I saw that note too. But both equations are for the same failure mechanism and the commentary to the 2005 specifications for Chapter J appears to say that the nominal strength for the threaded rod is based on the threaded area assumed to be 0.75 times the bolt area.
  9. tslewis

    Tension Rod Capacity

    I understand the thread area calculaiton. The quesiton is i) Can I ignore the Chapter J equaiton if I use the Actual thread area in the Chpater D equaiton for Net tensile fracture? Chpater J appears to be an approximation to that of Equaiton D for net tensile fracture. The Chapter J equaiton...
  10. tslewis

    Tension Rod Capacity

    1. Latest ASD/LRFD 2005 Specifications Chapter J, Table J3.2 and Equation J3-1 for tensile rupture Nominal strength of threaded part 0.75*Fu*Ab ASD Factor of safety 2 LRFD Reduciton factor 0.75 ASD Allowable strength 0.375*Fu*Ab Chapter D, Equation D2-2, Tensile rupture Nominal strength...
  11. tslewis

    Tension Rod Capacity

    I understand that there are two different failure mechanisms in tension - AISC Chapter D. However, there seem to be two possible equations to desicrbie the net fracture failure under tension. The first comes from Chapter D and is based on the actual net area - i.e. the thread area, and the...
  12. tslewis

    Tension Rod Capacity

    For Design of Carbon Steel Tensin (non-upstand) rods to AISC I understand the following limits to be applicable: 1. Gross Yielding (Chapter D) a) ASD Ab - gross area of rod i.e. (pi*d^2)/4 where d is the nominal diameter of the rod Nominal Strength Fn = Fy*Ab FS - ASD Factor of safety =...
  13. tslewis

    HSS Limiting Wall Slenderness Change in AISC 2005

    Can anyone comment on why there are no longer any values for the wall slenderness limit of a HSS flange for flexure AND compression. (See Table B4.1 of the new AISC 2005 Specificaiotn for Structural Steel Buildings and AISC LRFD Maunual, 3rd Ed. Table 2.2-1 p. 16.2-4). The 2005 spec only fives...
  14. tslewis

    2005 AISC Spec Change for HSS Wall Slenderness

    Anyone notice that the limiting wall slenderness for a rectangualr HSS seciton under flexural compression has now been revised from 3.76 SQRT(E/Fy) - Table 2.2-1, p. 16.2-4 of AISC 3rd Edition to 2.42 SQRT(E/Fy) - Table 2.2-1, p. 16.2-4 of AISC 3rd Edition

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