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  1. parrot77

    Thin walled concrete vessel under compression

    ishvaaag, Thanks very much. I assume the formula relavent to my case is either 02 c or 02 d? Do you know when to apply Roark or Ugural? One is essentially half the magnitude of the other.
  2. parrot77

    Thin walled concrete vessel under compression

    Sorry guys forgot to mention its a concrete tankk.
  3. parrot77

    Thin walled concrete vessel under compression

    I have a thin walled circular tank buried underground. There is no positive connection between the lid and the top of the tank, so its essentially open ended. I have worked out the compressive stress in the wall. Can anyone give me an expression for the bucking capacity of the wall? Much of the...
  4. parrot77

    Plastic Analysis

    rb, for this collapse mechanism I am assuming that the point load is the dominant one, and that the udl on the cantilever is not sufficient to develope a plastic hinge at the support. Thus the mechanism described needs to overcome the cantilever moment in order to form the plastic hinges under...
  5. parrot77

    Plastic Analysis

    Thanks for your replies guys. BA looking at it again last night, you are correct, and yes you are right.. on reflection it is quite simple. C/2@ is the average displacement by the load qC hence work done = - qC^2@/2 Thanks again
  6. parrot77

    Plastic Analysis

    I have a question about a specific plastic analysis case, some of you guys may be of help. I have a beam fixed at one end and a cantilever on the other. Most common continuous systems will require 3 plastic hinges and the collapse mechanism will be independent of the load on the adjacent spans...
  7. parrot77

    SLAB ON GRADE

    pg1http://files.engineering.com/getfile.aspx?folder=a32cc7ba-9350-40ce-9af1-bcd5be892fba&file=groundbearing1.pdf
  8. parrot77

    SLAB ON GRADE

    pg2http://files.engineering.com/getfile.aspx?folder=b3e4dbe5-de54-4f9b-a985-2b30131aaa26&file=groundbearing2.pdf
  9. parrot77

    SLAB ON GRADE

    I have successfully designed (but never checked existing slab) using similar methods as per the method attached.http://files.engineering.com/getfile.aspx?folder=a15b0da3-2c82-43c3-81b6-10c26e4e8f02&file=groundbearing3.pdf
  10. parrot77

    SLAB ON GRADE

    hokie 66 what neaveyoung was suggesting was the origional live load could be examined to see if the new crane loading exceeds the design value. unless the floor is designed for large industrail raking/ forklift loading it is likely that the design load will be exceeded. Hokie66 who made you...
  11. parrot77

    Concentrated Moments applied to Slab

    What loadbearing wall? A plan arrangement of the suspended slab showing walls and columns will be neccassary for anyone to comment
  12. parrot77

    Errors in RCC Spreadsheets' Crackwidth Calculation

    I haven't designed a basement wall for a couple of years until tis week. I was landed with one this week and I designed it using this very spreadsheet. I obviously hand checked some of the critical stability calcs but not the crack widths. Now low and behold, just as the RC drawings are whisked...
  13. parrot77

    Moment Distribution Reference

    Dunno where it came out of to be honest!! Have it years but yep think its either mine or one of my collegue's uni notes. I have a wealth of all that kind of stuff saved up over the years. Its not actaully that complictated.. and I think its important to appreciate the hand calc methods that can...
  14. parrot77

    Moment Distribution Reference

    Hey boyos, Have a look at this.http://files.engineering.com/getfile.aspx?folder=fba40d90-973c-42ce-8113-5b1cfd90291e&file=The_Moment_Distribution_Method.pdf
  15. parrot77

    Column Strengthening for canopy structure

    or you could place a beam behind the cantilever beam spanning across the end bay between the end and second from end portal columns. Considering the lack of stiffness of the portal about its weak axis, most of the moment would be transfered into this member.
  16. parrot77

    Ground supported slab level

    Thanks SlideRuleEra, I am in Ireland and flooding and frost are not uncommon. Just for future reference, what would be the causes of trouble? Is it your opinion that water may bridge the wall (which is masonry cavity wall) then find away through the damp proof mat and then penetrate the...
  17. parrot77

    Ground supported slab level

    This is not a stricly Engineering problem but someone may offer some insight. For under floor heating on a concrete ground supported slab I require 110mm of insulation to satisfy the U-value requirement.(Sourse- insulation manufacturer backed up by my own calcs) Hense my ground floor build up...
  18. parrot77

    BEAM

    What structuralEIT means that the end of the element is connected such that moment cannot be transfered/ carried at the connection. 'Rotate freely' is an assumption we make to simplify analysis. For example if a column is fixed to a foundation that is not capable of transmitting bending moment...
  19. parrot77

    Wall / Column Kicker - Re

    A pony wall is a wall that you sit on and ride around the building.. very partial to sugar lumps
  20. parrot77

    Retaining Wall For Trash Question

    Ouch your right hokie66!!! Dont really have a feel for the empirical units. Sorry guys. Ye regardless of machinary or parameters it seem a very light load to be taken at the bottom of a 33ft wall. If machinary is working on top of the trash and not just at ground level shoving it in /out...

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