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  • Users: youngstructural
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  1. youngstructural

    An old structural paper / question

    Hello All; Having contributed to another thread has made me think of a rather old engineering mystery. I'm hoping someone out there *cough* insert standard regulars here *cough* might be able to help: I don't suppose anyone knows the "mythical" paper from the 1910s or 20s that discusses how...
  2. youngstructural

    Working Stress Design Web Bearing Capacity

    Hello All; I need to know a wee working stress design trick... I was once taught a quick little ditty of a working stress check to see if you need a stiffener to prevent web cripling. Has anyone else heard of this? Does anyone know the trick I'm talking about; Preferably with reference...
  3. youngstructural

    Archives collapse in Cologne...

    <script src="http://i.cdn.turner.com/cnn/.element/js/2.0/video/evp/module.js?loc=int&vid=/video/world/2009/03/03/bpr.germany.building.collapse.cnn" type="text/javascript"></script><noscript>Embedded video from <a href="http://www.cnn.com/video">CNN Video</a></noscript> Amazing that more people...
  4. youngstructural

    How not to get ahead, and what not to post at your desk

    So I was under more than a little pressure and decided I needed a way to get out a little frustration... I stayed late on a Friday night and created a little flow chart to politely tell people to go away when I am facing a difficult deadline. I have never posted said chart. Now, today I had...
  5. youngstructural

    Structural Engineering Rules of Thumb

    There have been some great posts skirting around this subject, however I really think we need a Tips & Tricks FAQ. With that goal in mind, I thought it would be good if we all posted the routine rules of thumb we use in our daily work, in order to perhaps learn some useful shorthand and tips or...
  6. youngstructural

    What happened to ACI 408.1R-79 ???

    Hello All; I'm trying to obtain a copy of ACI 408.1R-79(Revised1984), "Suggested Development, Splice and Standard Hook Provisions for Deformed Bars in Tension", but cannot find it at any of the nearby Universities and the ACI website does not seem to have the report available. Does anyone know...
  7. youngstructural

    State of the Art Paper by H.G. Poulos

    Does anyone have this paper? It was discussed a couple of times in the past on Eng-tips, however I've not managed to find a copy, physical or digital. Can anyone send a copy through to me? Thanks, YS B.Eng (Carleton) Working in New Zealand, thinking of my snow covered home...
  8. youngstructural

    Fiberglass lined pool cracking

    Hello All; I have a client with a pool which has been cracking through the fiberglass lining. The cracks in the fiberglass are approximately 1.0mm wide, with the mirroring cracks in the concrete below being fine hairline cracks ranging from 0.2mm to 0.5mm. The pool construction is a cast...
  9. youngstructural

    Computer output shows value of real-world judgement

    So I was looking at a plant deck for an existing building, and in designing some of it using software I have found quite the humorous computer output. Warning: Probably not funny to anyone other than a Structural Engineer, and that might even be a stretch! Not to restart the "when is...
  10. youngstructural

    Strut and Tie evaluation of existing structures

    Hello All; Does anyone know what the requirements would be in order to be able to apply strut and tie method (STM) to an existing structure? I know that you are allowed to apply STM to B (beam) regions, but I am curious about any potential material requirements that existing structure might...
  11. youngstructural

    Existing Concrete deterioration...

    Hello All; Given an older reinforced concrete showing some signs of deterioration, including minor cracking across the members, autogenous healing, pitting and some minor discolouration, do you typically down-grade the concrete capacity? Do you down-grade the resulting member capacities...
  12. youngstructural

    Bridge loading factor

    Hello All; Here is my question: In absence of code guidance, I am looking for opinions (perhaps based on ASSHTO or CAN/CSA S6 or another international code) on what live load factor is appropriate for a "known" loading onto an existing bridge for evaluation purposes? If you want to know why...
  13. youngstructural

    Why the debond length?

    When specifying anchoring into rock, or similarly with soil nailing, you always see a purposefully debonded length... Other than causing a predictable location for yielding, what is the purpose of this debonded length? I'm sure I've seen this discussed, or heard the reasoning before, but I just...
  14. youngstructural

    Are standards slipping?

    I really want input from actively consulting engineers, and particularly Structural. This is about the technical standards in our particular specialisation of the profession falling, and relates directly to Structural Engineers. There is a great deal of debate on at the moment here in New...
  15. youngstructural

    Steel Plate to increase Concrete Beam Capacity

    Hello All; I'm looking at adding a steel plate to the underside of an existing concrete beam. I've done this before, and am pretty sure I know what to do, but have not liked the numbers I'm getting... I want to add a 25mm thick plate to the underside of a 250 wide, 430 deep section spanning...
  16. youngstructural

    What concrete strength to assume

    When we only have a mix design indicating the ratio of components, such as 1:2:3 or 1:2:4 and no further information? I intend to require material testing of the existing structure to confirm, but what should I assume to start with? I have typically taken 1:2:3 mix as being between 2500 and...
  17. youngstructural

    Existing structural material tests

    Hello All; We have an existing structure that we are renovating (removing interior load bearing walls and adding a second floor). We're going to specify core tests of existing concrete and tention tests on existing reinforcement, but I'm looking for a publication that will give guidance on who...
  18. youngstructural

    Concrete Beam Column Joint Design

    I'm hoping someone has a good design procedure for Beam Column Joints. I've applied the "standard" procedure for BCJs at high ductility from the NZS 3101 code (similar to ACI 318), but want to me more confortable with the design. I also think I have over designed (ie over confined) the joint...
  19. youngstructural

    Friction on a posthole foundation

    I'm trying to find what the pull out resistance for a post hole foundation would be. We often use 900mm diameter by 1200 to 1800mm deep, round posthole footings. I would like to use skin friction to assist against uplift. How would I develop the effective strength of a posthole due to...
  20. youngstructural

    Limiting Tip and Side Resistance: Fact or Fallacy?

    Limiting Tip and Side Resistance: Fact or Fallacy? by Fred H. Kulhawy from the 1984 ASCE conference on pile design "Analysis & Design of Pile Fndns., Ed. JR Meyer, ASCE, New York, Oct 1984, 80-98." I'm trying to locate an electronic resource for this paper. It seems like the ASCE site is...

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