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Recent content by tincan

  1. tincan

    Elastromeric bearings

    might try for an update of "Design of Neoprene Bearing Pads" by Dupont best tincan
  2. tincan

    rule of thumb design

    "Data Book For Civil Engineers" Volumn 1 - Design by Elwyn E. Seelye John Wiley & Sons a very good reference for the library
  3. tincan

    Top Bars for Concrete Joists

    JAE, sorry 'bout that. Unfortunately, ACI-63 contaied 2 pages on Joist constructin with the best advice reading..the slab shall be designed by approved methods taking into the account the effect of contunuity...I liked the old methods, it made you engineer a job. Checked CRSI working stress...
  4. tincan

    Pre-cambering Steel Beams

    In the mid 70s Fears Structural Lab did some testing of composit sections constructed by inverting the slab and beam. The inverted beam was supported at the end points and the slab was poured into a frame attached to the beams. When the slab reached 7-day strength, the beam was inverted. This...
  5. tincan

    Top Bars for Concrete Joists

    ACI 318-63 Part V 2001(d)"....such slabs shall be reinforced at right angles to the joists wit at least the amount of reinforcement required for flexure....." Never throw away your old references...Best, Tincan, one of the old timers.
  6. tincan

    Precast Slab - Transverse Reinforcement Question

    For main reinf parallel to traffic % bottom slab transverse reinf = [100/(span)^0.5]amt main reinf .....span in feet...so for a 20' span use 23% of the main reinf This is 1992 AASHTO, but its all I have at Home, Use nominal T&S in top of slab. Best, Tincan
  7. tincan

    Anchor bolt "group" in circular layout

    If the normal embedment length cone pullout dosn't work, try placing a plate at the end of the anchor bolt. Use a 6" x 6" x 1/2" plate welded to the end of the bolt. We normally use 1 1/2" to 2" bolts with the plate affixed. Tincan
  8. tincan

    Footing Anchored On Inclined Rock Surface

    ? L-Shaped wall with footing? Are you going to construct the footing level or on the incline? Tincan
  9. tincan

    Anchor bolt "group" in circular layout

    Check AWWA D-100 "Welded Steel Tanks for Water Storage" The design tension loading per anchor bolt is: P = 4M/Nd - W/n P = design tension loading per anchor, # d = diameter of anchor bolt circle, feet N = number of anchors M = wind load moment, ft-lbs W = tank DL resisting wind load, lbs...
  10. tincan

    Footing Anchored On Inclined Rock Surface

    Are you meaning to construct a sheet wall (wall--no footing)that is keyed at the base and tied back at the top similar to walers in a sheet piling wall? If so design as a sheet piling wall with tie backs. Best tincan
  11. tincan

    Punching Shear

    Do you mean the shear developed in the floor slab at the critical section/perimeter of the column? Check the PCA for spearhead reinforcement. The addition of channels in a cross configuration works. Best, Tincan
  12. tincan

    Bin design with ACI 313-97

    Try "Useful Information on the Design of Steel Bins and Silos" published by AISC and Steel Plate Fabricators Assn. Best, Tican
  13. tincan

    Uplift for Anchored Steel Tanks

    Steve, Take the six-bolt pattern for the worst case, 2 bolts on X-axis and wind loading moment on Y-axis. Moments about X-axis, only 4 bolts in pattern, 2 in tension & 2 in compression, # bolts in tension = 2N/6 = N/3 Resisting Arm = dsin60 = 0.866d Bolt Tension = M/[0.866dN/3] =3.46M/Nd...
  14. tincan

    Uplift for Anchored Steel Tanks

    SteveBraune A few years back I wondred about the same question that AdamU had. Made up a little spreadsheet to determine the bolt tension as the number increased: #Bolts "d"equivalent CG Resulting T 4 d 4M/Nd 5 0.7695d 3.25M/Nd 6...
  15. tincan

    grout topping in a clarifier

    Remove the screeds from the rotary arms of the clarifier and attach 1" x 4" finished lumber to the arms (set about 1/4" to 3/8 below the position of the clarifier screed). Use the clarifier to sweep in the surface. This will give you a sufficient finish. when you replace the screeds, they...
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