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Recent content by BarryEng

  1. BarryEng

    Concrete Pad in Iraq

    I will not comment on the structural issues, but as far as concrete quality is concerned, you may be interested in a joint publication of CIRIA & the Concrete Society: - Guide to the construction of reinforced concrete in the Arabian peninsular CIRIA publication C577 Concrete Society special...
  2. BarryEng

    Joints in reinforced slab on grade

    I don't know if I can post the full publications on this site, but here is a brief list. If you want to know some excerps, reply to this post. Concrete Society, TR34, 2003, 148p Concrete Institute of Australia, Design of joints in concrete structures, CP24, 2005, 20p CACA Australia...
  3. BarryEng

    Joints in reinforced slab on grade

    Thanks for the reference. It contains some information that I have seen in a CACA paper on concrete slabs. I'll see if I can find the reference & post it. I only work with completely restrained slabs & it appears to me that you are on the right track.
  4. BarryEng

    Joints in reinforced slab on grade

    When I started work using concrete slabs, your question was one I also tried to find an answer to. Perhaps if I answer a question that you did not ask - it may open up discussion from other readers. What level of reinforcement is required in a concrete slab so that joints are not required? It...
  5. BarryEng

    expansion couplings in above grade pipe

    I meant to mention in my earlier thread, that when you weld the pipe together without expansion joints, thermal forces on an empty pipe will generate about 3 to 4 times higher forces (axial) than for the pressure (water utility) forces. If the steel pipe is empty & subject to full solar...
  6. BarryEng

    Local Pipe Stress on Saddles

    Have a look at AWWA M11 (steel pipe design & installation) for a detailed analysis of 'local' support stresses (generally large water utility pipes). Also ASCE 79 (power penstocks) for similar (but more comprehensive) analysis & design (large power penstocks). Bednar (pressure vessels) also...
  7. BarryEng

    expansion couplings in above grade pipe

    If you have a look at AWWA M11 (manual for steel pipe design & installation), table 7-1 shows that a 42" pipe can span over 70' if the plate thickness is 5/8". This assumes that you have a 'normal' saddle support of 120 degrees. With a ring girder support, the span could be increased...
  8. BarryEng

    Wastewater Outfall Pipe Capacity

    The long answer is - use EPANET for the layout. EPANET is a free program that is downloadable from the net (EPA, USA web site). You can model the whole pipe system from start to finish in one go. The short answer is you can model each single pipe system (outlet) & use each result as a head...
  9. BarryEng

    Rectangular Tank Top Edge Stiffening

    Do a google of this site (top of this page) for 'rectangular tanks' for many threads. I think that some of them also addressed top edge stiffening.
  10. BarryEng

    Design of concrete base.

    I agree with hokie66 - you need to determine the reason for the spalling. I had a situation with concrete deterioration at the base of 35 m high HT power poles. It was the same situation that I have had on pipe support (concrete) piers. Contact with saline ground water, thermal effect of the...
  11. BarryEng

    collecting rainwater

    In remote areas of Australia, we use a 'roaded catchment' for collection of rain water (in low rainfall agricultural areas) usually for farm dam supplies. The roaded catchment consists of a series of very shallow V shaped channels that are in parallel to each other (I hope that explains the...
  12. BarryEng

    Slab supported on 3 edges.

    hokie66 - I agree. I did assume that the support was fixed (or continuous). A 3 to 1 slab has very little support in the long direction. It usually fades away at about 1.5 to 1. My answer above really applied to rectangular tank walls (as an example of a rectangular slab). This would mean a...
  13. BarryEng

    Slab supported on 3 edges.

    Do a google (top line of this page - within the web site) for rectangular slabs. On one of these threads, look up the reference for the USBR manual for rectangular slab analysis (Moody tables). It is about 6 Meg (I think) but is a very useful reference - many proportions of slab, support...
  14. BarryEng

    PCA Tables for circular and rect tank walls

    When you say 'the PCA tables' - do you mean the 2002 PCA 'design of liquid contining concrete structures for earthquake'? By J A Munshi, 54 p, ISBN 0-89312-219-X
  15. BarryEng

    Anchor flange

    The USBR design book for power penstocks (ASCE manual 79) contains the complete details on designing an anchor ring - bending of the ring, bearing loads, weld stresses etc.
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