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  1. StructSEZ

    Blockwork shear walls

    Hi, Usually, if the masonry goes to ground and sits on a strip footing of some sort, then it will invariably behave as a shear wall. Generally, these old masonry buildings were highly cellularised on plan, due to the small tributary widths which the blockwork could take. As such, you would get...
  2. StructSEZ

    Things to consider when building gymnasium on ground floor

    "I would use cast-in-place concrete for any suspended gym floor - more mass = less vibration issues." Not quite right. The vibrations only stabilise when the frequency causing excitement (imposed cyclic load) because equal to the structure's natural frequency. So what you want to do is, make...
  3. StructSEZ

    Non-Standard Structural Shapes

    Try ProSec in the Prokon software suite. Cheers
  4. StructSEZ

    DCP vs. Young Modulus

    Hi guys, By any chance, would anyone have any ideas on estimating an effective value of Young's modulus from DCP results? I've come across some relationships between SPT and Young's modulus, but can't seem to find anything linking DCP to E`. Any guidance greatly appreciated. Thanks,
  5. StructSEZ

    Bolts Loosening and Coming Off

    Mike, Yeah, we've done that. The issue is the Contractor is in Africa and we're a tropical island in the indian ocean. They were flown in and the steel was shipped in. The argument to get them back here is ongoing, however, in the mean time we're going up there ourselves to tighten the things...
  6. StructSEZ

    Bolts Loosening and Coming Off

    Thanks for the input guys. I suppose I'll have to really take a look at the option of poor worksmanship. Detective work's afoot! Thanks again,
  7. StructSEZ

    Bolts Loosening and Coming Off

    csd, The hangar was handed over about 3 months ago only. (brand new!) Most of the bolts that are loose are on the fly-braces and in splice plates on the primary trusses. Also, some of the bolts on the roller door hangers as well. So, pretensioned bolts might be the way to go then... I'm not...
  8. StructSEZ

    Bolts Loosening and Coming Off

    Ishvaag, Firstly, let's just point out, this structure is not 'mine'. I was not the designer for this thing. I'm consulting on how to fix it. Secondly, the whole tack weld this is a bit of a band aid solution and as you say yourself, it is prone to fatigue. Clearly, this thing is...
  9. StructSEZ

    Purely Theoretical Concrete Beam Question

    Hi Lion06, To calculate the immediate deflection, what you want to do is find the moment which causes the stress at the bottom of the beam to be 0 MPa. (The point at which the crack is just about to open, let's call it Mcr) Any deflection caused by that moment or less should be calculated by...
  10. StructSEZ

    Bolts Loosening and Coming Off

    Hi guys, I've got a situation where an aircraft hangar (trusses on concrete columns) is experiencing bolts falling out. Some of the guys reckon the builder/rigger did a poor job of tightening them. However, I find that a bit hard to believe. In your experience, what would cause snug-tight (not...
  11. StructSEZ

    Transferring large lateral forces at base of braced frame

    I tend to take a U-bar from reo and thread the two ends. They then extrude out the top, whilst the 'flat' of the u-bar is cast in.
  12. StructSEZ

    Treatment of Soapy Water for Discharge to Natural Waterway

    Thanks bimr.
  13. StructSEZ

    Treatment of Soapy Water for Discharge to Natural Waterway

    Hi guys, Thanks for all the replies. Love the way this whole thing became a holiday auction! Spartan, I don't actually work for the government, just doing some consulting for them. But other than that, yes, Seychelles islands in the tropics (hence the SEZ in StructSEZ)...warm weather, sand...
  14. StructSEZ

    Treatment of Soapy Water for Discharge to Natural Waterway

    Hi, I've got a job here to beef up a government agency's 'green rating' on their building. One of the things that can be improved on is the run-off of soapy water which is created when they wash their cars. Being a diplomatic/protocol department, they have a fair few fancy cars for use by...
  15. StructSEZ

    Concrete Moment Frame Question

    Haven't had anything fail yet, mate!
  16. StructSEZ

    Hanging a structure from steel frames

    Hi 9, I once came across something that sounds similar to what you're saying. An old university lecturer once told that he had a high rise and the architect wanted minimalist columns to maximise clear line of site on the open plan spaces. So they built columns to act in tension. There were...
  17. StructSEZ

    Concrete Moment Frame Question

    Hi dc, JAE is on the right track. Force will follow stiffness on the basis that deformations are compatible. Now, from this you can control which elements will respond by either increasing or releasing it's stiffness. In your case, when you want a column to be part of the moment frame you...
  18. StructSEZ

    Foundation Design with a UDL loading

    The depth is determined simply by finding a level which has stiff/sound material and you just found the footing there. With regards to dimensioning the footing, as Kieran says, it's just a strip footing. You adjust the width of it to give you your allowable bearing pressure. With regards to...
  19. StructSEZ

    Construction Joint Testing

    Ron, Thanks for the reply. With regards to the wall, I meant that there's a shear wall underneath which is also supporting the slab. Just out of interest though, what is 'friction steel'?
  20. StructSEZ

    Construction Joint Testing

    Thanks for the reply. I see what you mean regarding the friction mechanism as a method of stress transmission. I'll do some numbers on that. I believe the friction co-efficient of concrete generally floats around 0.33. I'll also include a range adhesion values to model the non-mechanical...

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