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  • Users: Trenno
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  1. Trenno

    AS1170.4 Draft

    New AS1170.4 draft is out for public comment, closing 18/01/24. Seems like reo rates may be on the rise again with the introduction of these two proposed admendments.
  2. Trenno

    AS3700 & BlockAid Chairs

    Hoping to get some industry feedback on whether anyone has successfully used BlockAid bar chairs in lieu of traditional rebar ties? This would then mean you can design as reinforced and Mu = 2. The following clause in the NCC essentially means 200 series blockwork needs to be designed as...
  3. Trenno

    Shoring Walls & Lateral Stability

    I'm hoping to create a discussion about best practices in capturing the influence of shoring walls on lateral stability behaviour (backstay effect). Typically speaking in my region of the world, the shoring system consists of ~600mm reinforced concrete soldier piles at ~1800mm c/c with 200mm...
  4. Trenno

    Seismic Torsional Sensitivity - AS1170.4 & NZS1170.5

    It's common for modern commercial buildings in Australia to have an offset core to allow greater open plan flexibility. The mode shapes of such buildings usually demonstrate torsional behaviour, especially within the first two modes. Example: I know many international codes will penalise you...
  5. Trenno

    Virtual Work Diagrams

    I have only recently started to investigate the Energy/Virtual Work Diagrams feature within ETABS. I'm curious how many others are using it to assess lateral stability systems? Few initial thoughts: - Would there be any benefit if CSI broke down each degree of freedom (ie axial deformation...
  6. Trenno

    Calculation Packs

    In the UK, for every new structure that is erected it needs to be reviewed and approved by Building Control which is a local government authority. This will include reviewing the drawings, specs and a calculation pack. Going through this process on a recent project I had a few thoughts that...
  7. Trenno

    Overlapping Struts STM

    Currently refreshing myself in the world of STM with the current situation: a transfer wall with two columns and beam framing into the top of it. The reactions from the columns and beams are roughly similar in magnitude. What advice would you give for dealing with the overlapping struts from...
  8. Trenno

    Paperless Remote Working

    I'm sure we've all spent a considerable amount of the last 12 months working remotely without access to the office printer and therefore being forced to work paperlessly. Interested to hear other's experiences about how you've either struggled or adapted with new ways of working with various...
  9. Trenno

    Part II - Column 3D Interaction Surface vs Code Biaxial Formulae

    thread507-460377 What are people's opinions on applying 3D interaction diagrams or codified biaxial for walls? I'm thinking factors like high aspect ratios, return walls and end bar clusters would skew the results compared to a stocky square column. Essentially the buckling mechanism would be...
  10. Trenno

    Wall Buckling Effective Length

    With reference to sketch below, say you have a riser opening on each floor at the back of the lift shaft wall. Say we're also designing the core as 4 separate piers. In terms of the blue wall effective length for buckling, I know the answer lies somewhere between: a) Wall supported on each...
  11. Trenno

    Australian Journal of Structural Engineering - RW Chapman Medal

    I see a lot of discussion regarding the new seismic design and detailing rules for AS1170.4/AS3600. Therefore it seems prudent to share this article: RC Walls and Seismic Design paper scores top structural engineering Medal Direct link to paper itself
  12. Trenno

    Offset Link Beams

    Curious as to others' opinion on whether they would go for #1 or #2 for a classic coupled stair/lift core setup that doesn't quite line up (assuming both stair/lift inner dimensions are fixed/minimised to maximise the GIA/£/$). EDIT - never mind my pros/cons, one of them was a non-issue.
  13. Trenno

    ETABS v18 Errors/Issues

    Is anyone else out there having issues with ETABS v18 and it being very buggy? Sample errors below. Something isn't clicking over properly under the hood...
  14. Trenno

    Truss Optimisation App

    Thought I would share this neat, little LayOpt app that is based upon the Grasshopper plugin Peregrine. You can load heaps of different examples including the Mitchell truss. Set other boundary conditions, loads and optimisation constraints. This layout optimisation was used recently for a...
  15. Trenno

    Piled Raft Design in ETABS rather than SAFE

    The only difference I can see is that SAFE has the ability to perform cracked section analysis for the raft and apply elasto-plastic springs. But it seems you could estimate the load distribution and cracking using a simple stiffness modifier for the raft and non-linear area and point springs...
  16. Trenno

    Merging Unique Cells Into Unified Headings

    I have a long list of unique data in excel in the following form. As a first step I removed all the duplicates. The unique headings always start with a "$_". There are many more unique headings in the list other than GRIDS and MATERIALS. I would like to filter the Original List, such that...
  17. Trenno

    Rebar Sketching Tools

    What digital tools are engineers using to sketck up complex rebar details? I'm looking for an easy to use drawing application that I can quickly sketch bar layouts. I would assume it could make intuitive snaps, like placing bars at corners of a section user-defined covers. It would be able...
  18. Trenno

    Writing Tablets

    I always find myself writing on loose bits of scrap paper. Sometimes what I write down can be fairly important. Then usually this paper sits on my desk, until one day it spontaneously combusts and I can never find it again. Does anyone out there use writing tablets to combat this issue? I came...
  19. Trenno

    Effective Stiffness Modifiers > 1.0

    I was reading a paper recently and it highlighted something I'd not given much thought to previously. The paper discusses the idea that effective stiffness modifiers, i.e. the scaling of the gross moment of inertia of concrete elements within FEA, can potentially be greater than 1.0 when the...
  20. Trenno

    Column 3D Interaction Surface vs Code Biaxial Formulae

    What are the major benefits to defining the 3D interaction/failure surface over using codified bi-axial bending column clauses? I assume with the exponents in the unity equation they result in generally conservative capacities? Whereas you may be able to squeeze more capacity from full 3D...

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