Jump to content

ATTAK Z

Members
  • Posts

    12,617
  • Joined

  • Last visited

Everything posted by ATTAK Z

  1. Vucan and both Lancasters (Vera and Thumper) will be at Waddington tomorrow FYI
  2. in the Isle of Axholme this evening ... there's a reason you should PM me
  3. Mark of the orange Veilside ... one of the nicest blokes on the forum
  4. G-GAVA was previously registered as G-CCPW http://www.airframes.org/ and crash landed at the Isle of Man in 2012
  5. Don't try to increase the strength of the joints in the bottom chord by adding flitch plates (as you suggested you might do in post 17)
  6. PS the bracing that ioneabee mentions holds the masonry up rather than the roof
  7. Nice ... I'm near Donny and would happily let you use my Zed ... ... if I still had it !
  8. Right ... Gang nail trusses are designed to take compressive and tensile loads in the members. The strength of the joints (gang nail plates) is determined by trial and error rather than calculation, thus it's a bit of a black art. Bending stresses in individual members are induced by UDLs (uniformly distributed loads) which can be dead or live. The UDL in the top chord of the truss is composed of the dead weight of the roof tiles, battens etc. and the live load of snow and wind. The bottom chord of the truss is designed to take the dead load of ceiling finishes, mechanical/electrical services etc. and the live load of access for maintenance and repair. The raking members of the truss are simply in compression or tension with no induced bending stresses. What you are proposing will induce increased bending stress in the bottom chord of the truss whilst increasing the overall loading on the system and increase the tensile and compressive loads in all the members. This could be a bad thing as sooner or later you will overload the system. However, factors of safety are built in, 1.4 for dead loads and 1.6 for live loads IIRC, so providing you don't increase the load too much you should be OK HTH
  9. Here I am ... nearly ready to comment ! Just come back from having a nice Indian in Bawtry
  10. Bit of a misspelling there Chris ... will the cleaver people chop your head off ? but yes you're right about the switch
  11. I think he may have gone to a Bring and Buy sale at the church hall and got a bit mixed up
×
×
  • Create New...