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  1. sdz

    Tank Overturning Stability Criteria

    Thanks for your comments.
  2. sdz

    AS 2870 vs NCC

    Liam, you're probably better posting in AS/NZS (au/nz) Code Issues More information with table numbers would be helpful.
  3. sdz

    Tank Overturning Stability Criteria

    Muhammad@ZEL, For the depth of liquid refer to; i.e you use 1/2 the design liquid depth AND only consider an strip around the edge of the tank. Most of the liquid weight is ground supported and does not resist overturning. I assume this is based on the low probability that the design wind...
  4. sdz

    AS2304 and seismic loads

    It's not the 25 years that specifies the design criteria, it's "importance level of 2". Referring to the NCC/BCA then gives Earthquake 1/500 probability with kp=1.0 to AS1170.4. In addition the importance level would be increased if necessary to match the structure it serves. So a fire tank...
  5. sdz

    Bar Around Corner of Cantilever Concrete Retaining Wall

    You can clean up the reinforcing detail by moving the horizontal laps away from the corner. Typically the vertical bars will be in place and the horizontal bars will fixed to the outside. This might change if you have to fix the steel from one side only. Note the outside corner vertical bar will...
  6. sdz

    AS2304 and seismic loads

    Here's something that just tripped me up. However if you go to AS 1170.4, Table 3.1 you find P=1/800 kp=1.25 P=1/500 kp=1.0 (BCA Importance Level 2) P=1/250 kp=0.75 (nominal design life of 25 years) Unfortunately there is no commentary on this which leaves me thinking that the...
  7. sdz

    Effective Wind Area - Stud Wall with Parapet

    Agree with M.IDR. Use 7' for the cantilever then use the full 21' for the rest.
  8. sdz

    Bolt areas (Tensile stress area, Minor diameter area, Shank area)

    They are tabulated in ASI design capacity tables. https://www.steel.org.au/resources/book-shop/?asi_prd%5BrefinementList%5D%5Bcategory%5D%5B0%5D=Design%20Capacity%20Tables This on line doc has the data although not in one page...
  9. sdz

    Trimmer bars to reentrant corner in suspended slabs

    Then perhaps we could use this? This is to AS3600. Make adjustments for your own code. The 500mm dimension is taken from TR34. In AS3600 for exposure classification B1+ strong crack control is required so no additional reinforcement would be needed. That should read Ast=(6.0-2.5σcp)Bd * 10^-3
  10. sdz

    Revised internal pressure calculation in AS/NZS 1170.2:2021 Part 2

    here is an internal pressure calculator I wrote as a result of this discussion. I'm pleased that the results match the example give above..
  11. sdz

    Revised internal pressure calculation in AS/NZS 1170.2:2021 Part 2

    "T5.1(B) directs the reader to Cl 5.4.4", how did you get that?
  12. sdz

    Revised internal pressure calculation in AS/NZS 1170.2:2021 Part 2

    I think you are reading it wrong. Let's see what others say. btw, in the bottom row what does "t5-1(b)-1" mean? I suspect it was meant to be
  13. sdz

    Revised internal pressure calculation in AS/NZS 1170.2:2021 Part 2

    You're right. However; For nominally sealed buildings you'll be using Table 5.1A. Table 5.1B only applies for dominant openings. When there is a dominant opening; When Kl affects internal pressure it affects entire surfaces so it is no longer a local pressure on those internal surfaces. When...
  14. sdz

    Trimmer bars to reentrant corner in suspended slabs

    OK I know this has come up before but perhaps there is some new information. Is there a rational way to design reinforcement required at a reentrant corner in a suspended slab (or wall)? For slab on ground the Concrete Society TR34 says; This says nothing about the slab thickness or about...
  15. sdz

    Revised internal pressure calculation in AS/NZS 1170.2:2021 Part 2

    5.4.4 Local pressure factor (Kℓ) for cladding The local pressure factor (Kℓ) shall be taken as 1.0 in all cases except when determining the wind actions applied to cladding, their fixings, the members that directly support the cladding, and the immediate fixings of these members. 1.4.6 cladding...
  16. sdz

    Development length cog - AS 3600

    13.1.2.5 Development length around a curve Tensile stress may be considered to be developed around a curve if the internal diameter of the curve is 10db or greater.
  17. sdz

    Development length cog - AS 3600

    p.s. It might be better to post in AS/NZS (au/nz) Code Issues
  18. sdz

    Development length cog - AS 3600

    What if you had a straight portion of 0.25Lsy.t, what would the overall contribution be? Without a transverse bar the cog can develop 0.5Lsy,t=Lsy,t*400/fsy. You would then get another 0.25Lsy,t from the straight extension. So for fsy=500MPa you could get (0.4 +0.25)Lsy,t =0.65Lsy,t. [AS3600...
  19. sdz

    Rotational Stiffness of a Joint How to Check

    Normally you don't check rotational stiffness of a joint. You detail and design it as either a rigid or pin connection. There are a range of connections that are accepted as approximation either of those conditions, even though they will not exactly provide the theoretical stiffness. If it is...
  20. sdz

    16' or 8' or 4' Retaining Wall?

    jhnblgr has a good suggestion to bring the footing up to slab level. Can the roof provide lateral restraint? What if roof need to be removed? I would tend to not rely on the roof providing restraint and allow some movement at the top of the wall. What about drainage, exterior loads, property...

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