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  1. m63

    Circular Concrete Tank Formula

    Would anybody have PCA 'Circular Concrete Tanks Without Prestressing' publication handy to give me a formula for wall thickness calkulation?? Thanks.
  2. m63

    Orientation of Floor Joists

    Thank you all for your input. Seems there is no widely accepted role for floor joist orientation.
  3. m63

    Orientation of Floor Joists

    Hi, Is there a role of thumb for orientation of wood joists in tree storey building? I am thinking that floor joists oriented parallel with roof trusses makes sense from a lateral load resisting point and this orientation usually requires less load bearing walls but usually see them oriented...
  4. m63

    Seismic Zones in Canada?

    I've had this thread in 'structural engineering other topics', but no replies. I hope for better response in this forum: Am I right thinking that one place in Canada belongs to two different seismic zones if it has different Za and Zv values? And than, how and when would you differentiate in...
  5. m63

    Seismic Zones in Canada?

    Am I right thinking that one place in Canada can be in two different seismic zones according to Za/Zv values? And than how and when would you differentiate in practice, what seismic zone would you assign to Ottawa for example(Za=4, Zv=2)?
  6. m63

    Wood to steel deck fastener

    I'm looking for screw fastener to be used in non-structural application of 3/4" plywood on top of 1-1/2", 20 gauge steel deck. A brand name, designation and other info would be appreciated.
  7. m63

    Joist Reinforcement

    What would be the best way to reinforce existing 2x12@16 c/c roof joists for additional point loads since only way to double the joist would be to install second ply in two shorter lengths (installation of full length joist is space restricted)? Could it be still considered as a built-up beam...
  8. m63

    Safe Design

    I was checking an old concrete slab for a heavier loading and found that the slab was well over designed at the time and very suitable for new loads. This’s got me thinking of the new limit state designs that structural engineers perform nowadays. What are margins of safety that you guys allow...
  9. m63

    Two Way RC Slab With Concentrated Load

    Thank you all for grate inputs. I’ll do it in staad but will probably get the book too.
  10. m63

    Two Way RC Slab With Concentrated Load

    thank you both for your inputs. jike, would STAAD be a good FEM program? jec67, is book helpful enough so I wouldn't need to use FEM program, does it have examples, aids or it is theoretical only?
  11. m63

    Two Way RC Slab With Concentrated Load

    What is acceptable method to design two way slab for a concentrated load? Slab is 12'x15' continuous, with reinforced concrete walls along 12' span and concrete beams along 15' span. Does anybody have a good method of distributing a point load to two spans and any other suggestions would be...
  12. m63

    Pressure relieve valves

    How can existence of pressure relieve valves in floor of underground concrete tank be taken into account to lessen influence of high water table on walls of a tank? Should walls be designed for hydrostatic pressure of max WT anyway?
  13. m63

    Upturned Key in Concrete Tank Construction?

    Makes good sense since even 3" or more of rebar cover would be lost mostly to depressed key itself and wouldn't allow for waterstop placement. But, how do you build curb monolithically with slab? I'm thinking that it would be the way to build raised key too. Thanks for your input.
  14. m63

    Upturned Key in Concrete Tank Construction?

    PCA publication 'Rectangular Concrete Tanks' calls for 'Upturned Key' between slab and wall as well as at construction joints. Can someone comment on reasoning for raised keys, could it be for better location of waterstop (higher above the plane of actual joint) or there are other reasons? Is it...
  15. m63

    Moving Abroad

    You can go to http://www.peo.on.ca/ to find out more about licensing and registration in Ontario for your particular case. Also here are some of the Canadian codes that you should get familiar with if you are going to practice structural engineering: A23.3 -Design of Concrete Structures...
  16. m63

    Waste Water Treatment Tank

    dutchie, My company is doing project management,civil and structural part of design. I am preparing specs for civil and structural part. I don’t have any info on process or capacity of tanks yet but got a task to find the pros and cons of different types of tanks and prepare myself to write...
  17. m63

    Waste Water Treatment Tank

    Working on municipal waste water treatment plant specifications for small town in cold Canadian climate. What is preferable structure type for settling tanks todays: steel or concrete; circular or rectangular; who are manufacturers of these structures; where can I find specs and any other...
  18. m63

    Pressure Tank Sizing

    Pumpdesigner, Thank you for the response. This is a small system to supply a plant. Expected average flow rate 50 gpm, peak flow 100 gpm, pump capacity 100 gpm. Distance between well and tank 150 feet, between tank and plant 250 feet, plant is at 15 feet higher elevation then tank.
  19. m63

    Pressure Tank Sizing

    What would be most commonly used pump running time for sizing of pressure tanks? Pump capacity will be in the range of 100 to 150 gpm. I have seen deferent numbers around, like 6x, 10x or not more than 25 times per hour pump cycle. Anybody knows a good literature/article or online catalogue on...
  20. m63

    EPANET modeling

    BobPE, In my view, you either help or you don’t. Anything else is just inappropriate. Anyway, I am not going to get into this anymore. Thanks again for your quick response to my question.

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