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  1. GeorgeTheCivilEngineer

    Cover your pergola

    i should think the plastic sheet fails before the frame or the house!
  2. GeorgeTheCivilEngineer

    Structural Ridge Beam Force direction

    Load will go where it is stiffest. The vertical supports for the ridge beam are likely to be the stiffest part so i would expect the load to transfer via the ridge beam to the vertical end supports. However I'm not sure how your intersecting sloped LVLs will 'lock everything together' but I...
  3. GeorgeTheCivilEngineer

    Fasteners for wood lath and plaster ceiling

    Early 1900 would be iron nails so they're as likely to have rotted through after 110 years. Can you not inspect the nails and/or the hole they came from? I assume you mean the modern code requirement but I don't believe there would be one for lath and plaster. Here we'd replace with...
  4. GeorgeTheCivilEngineer

    Brick Arching Action

    I had drafted a longish reply but the save draft function hasn't worked! In short - yes arching action in the wall above is reasonable. If the joists are in good condition and mortared in then they shouldn't necessarily affect that, but prudent to allow for it. The load from the floor would be...
  5. GeorgeTheCivilEngineer

    Strap bracing for roof purlin

    I think 'strut' is just a historical term rather than any literal compression meaning. https://www.screwfix.com/p/simpson-strong-tie-herringbone-joist-struts-480mm-25-pack/765TJ Getting the right tension might be a challenge using rolls of strapping.
  6. GeorgeTheCivilEngineer

    Strap bracing for roof purlin

    I'd call that a herringbone strut, sometimes seen in timber floors (although a bit old fashioned now, still available to buy).
  7. GeorgeTheCivilEngineer

    Misadventures in Rubber Stamping

    We don't have the same regulatory environment in the UK, so we don't have stamping. But I do have a somewhat similar relationship with a repeat client, I provide some engineering advice on discrete parts for many projects. Then occasionally they will drop a big project on my lap. What I have...
  8. GeorgeTheCivilEngineer

    Common mistakes by architects

    Roofs maketh the architect. Bad roof = bad architect and vice versa.
  9. GeorgeTheCivilEngineer

    Designing a Concrete pad

    I can see the need for a footing but less so the pad!
  10. GeorgeTheCivilEngineer

    Calculation of distributed load on beam

    You can do a very simple area assignment as a rough order of magnitude (essentially half the P7), but for detailed design because of the combination of columns and walls I would model this in a suitable structural design programme.
  11. GeorgeTheCivilEngineer

    Loads/Units shown on drawings

    I long ago switched to using lowercase on my drawings. It is easier to read and less prone to misinterpretation. But before that, yes I would always use the correct case for units.
  12. GeorgeTheCivilEngineer

    Ridge beams and roof pitch

    The pitch can introduce 15 to 25% extra dead load which can affect the long term deflection calculation. It's a simple calculation to do.
  13. GeorgeTheCivilEngineer

    Impact Force at Vehicle Crash

    Need to be clear about what you want to do. Resist the force without damage, or resist the force but destruction of the bollard is acceptable. Generally, specifying a pre-designed and tested system is the easiest route out.
  14. GeorgeTheCivilEngineer

    Equate CBR value to kN/m2

    No... CBRs aren't suitable for this. They need to do a plate loading test. This is safety critical. Don't put your name to a kN/m^2 derived from a CBR.
  15. GeorgeTheCivilEngineer

    Unreinforced Concrete Section Analysis

    Presumably it's an assessment rather than a design. 12.3.1(2) of Eurocode 2... But basically don't do it. Plain concrete has a brittle failure mode and even if what it is resisting is unimportant, you don't want a lump of concrete snapping off and failing. The only uses should be in...
  16. GeorgeTheCivilEngineer

    Wind Suction Overturning Moment for Container Foundations

    I don't think the argument is to fully ignore it, the question is whether it is 'worthwhile'. Given the other half of uplight mostly counteracts the uplift overturning and the roof length is small, the overall effect is likely to be negligible and can be ignored. I'd do a quick order of...
  17. GeorgeTheCivilEngineer

    Residential Portal Frame Deflection Limit

    It's a bit of fudge. SCI guidance allows normal, nominally pinned baseplates and apply base fixity for SLS cases - so no additional design required. It's worth having a squint at the particular guidance on it: https://steelconstruction.info/images/4/45/SCI_P399.pdf Chapter 7.4
  18. GeorgeTheCivilEngineer

    Residential Portal Frame Deflection Limit

    UK practise is to assume some level of base fixity. Either 20% (for serviceability deflection) or 10% (for stability). Eurocodes has never set out any deflection criteria because they couldn't get agreement so it's all done on secondary design guides. THat might change in the later editions...

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