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  • Users: dbuzz
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  1. dbuzz

    Conveyor support structure

    We typically have a horizontal deflection limit of H/500, up to a maximum of 50 mm (2"), under operating wind of 20 m/s (~45 mph), and H/250 under serviceability wind.
  2. dbuzz

    Petrochemical plants cost estimate

    Also: - The Association for the Advancement of Cost Engineering (USA), http://www.aacei.org/ - The Association of Cost Engineers (UK), http://www.acoste.org.uk/
  3. dbuzz

    Cast-in-bolt Development Lengths to AS3600

    The Australian Steel Institute's Design of Structural Connections is a great reference for the design of anchor bolts and anchor bolt groups. Don't rush out and by a copy, a new edition one is due late-2007. I typically specify Grade 250 round bar for anchor bolts.
  4. dbuzz

    HP 35s for you RPN engineers

    I like the look of this 35s. I had a 32sII (http://h10025.www1.hp.com/ewfrf/wc/product?product=58450&lc=en&cc=us&dlc=en&lang=en&cc=us) for many, many years and it was fantastic! After it died (sniff, sniff) I bought a 33s...
  5. dbuzz

    Fiberglass in concrete?

    Fibres (steel, fibreglass or polypropylene) are used in concrete to minimise cracking, especially at the surface. I've only ever seen fibre reinforced concrete (FRC) used in slabs-at-grade and in sprayed concrete ("shotcrete"); not in formed items such as beams, walls and columns. I've seen...
  6. dbuzz

    Petrochemical plants cost estimate

    Are you looking for Lang factors (i.e. process plant component costs as factor of priced equipment) or capital cost indices (CE Plant Cost Index, Nelson Farrar Refinery Inflation Index, etc.)? I don’t know of any sources that give unit capital costs, say in terms of bbl/day capacity. You may...
  7. dbuzz

    M&S Mining & Milling Index

    Thanks owg!
  8. dbuzz

    M&S Mining & Milling Index

    I'd be grateful if someone was able to 'fill in the blanks' in the M&S Mining & Milling Index series below. - Q1 2005 1,304.8 - Q2 2005 - Q3 2005 - Q4 2005 1,341.2 - Q1 2006 1,368.4 - Q2 2006 - Q3 2006 - Q4 2006 - Q1 2007 1,427.7 - Q2 2007 dbuzz
  9. dbuzz

    Australian code AS121 - design software

    There is PRESTO, however I can't find it using Google.
  10. dbuzz

    Engineering Firms rip off

    It's like that old joke about the retired engineer: An engineer retired after serving his company loyally for many years. Several years later, the company was having a problem with one of their generators. They had tried everything and everyone else to get the machine fixed, but to no avail...
  11. dbuzz

    Worth while to be a CPEng?

    Probably only if you do work for Local Government. As far as I'm aware, they are the only clients that require CPEng. Most other clients just require ISO 9001 certification. In my experience, potential employers are far more interested in your experience that your post-nominals. Engineers...
  12. dbuzz

    Concentrated loads on steel plate

    You'll find British Standards at http://www.bsi-global.com/
  13. dbuzz

    FIDIC "Engineer" vs design Engineer

    Isn't the party that you are referring to as the 'site engineer' actually the Principal's Contractor and your organisation the Principal's Engineer?
  14. dbuzz

    Concentrated loads on steel plate

    Roarks Formulas should address this case, however I don't have my copy at hand. In the Australian code for concrete design (AS 3600), the effective width of a one-way slab, deemed to resist moments caused by a concentrated load, not located near an unsupported edge, is given by the following...
  15. dbuzz

    anchoring a RC tank base to rock

    Rock bolting is actually quite expensive. I'd just add more mass in concrete.
  16. dbuzz

    Lime Silo Foundation

    What country are you in? The Australian standard AS 3774 Loads on bulk solids containers provides guidance on seismic loads for silos. My understanding is that in the United States, the requirements for non-building structures of ASCE 7-02 apply to silos. The ASCE's Guidelines for Seismic...
  17. dbuzz

    Wheel Load Near Retaining Wall

    Lateral earth pressure from point loads near a retaining wall are fairly easily determined using the Boussinesq equation.
  18. dbuzz

    Lateral Restrain At MidSpan

    See this extract from the commentary to AS 4100. I think it's best to take the conservative case and assume that 'Case 2' is unrestrained.
  19. dbuzz

    Shielding factor in Wind (AS1170)

    Isn't the spacing ratio, [λ], equal to: 0.70 for northerly and southerly winds, i.e. 7m (frame spacing) [÷] 10m (projected width of building normal to the wind) 0.71 for easterly and westerly winds, i.e. 5m (frame spacing) [÷] 7m (projected width of building normal to...
  20. dbuzz

    Lateral Restrain At MidSpan

    I agree with apsix's judgement. BTW, there are two excellent AISC (now SIA) journal papers that address the restraint afforded to beams and cantilevers by various connections: - Trahair NS, et al (1993), Design of Unbraced Beams, Steel Construction, Vol 27, No 1 - Trahair NS (1993), Design of...

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