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  1. BFPartners

    Need concrete storage pond design references

    I have designed several in ground storage tanks which are common in mining operations such as smelters and in refineries. Try ATLAS Chemical Company for the membrane. The "pool" should have a containment barrier membrane sandwiched inbetween two layers of concrete. Spec the concrete for the...
  2. BFPartners

    Is it ok to pour piers without use of a vibrator

    Vibration serves two main purposes: 1) Consolidates the interface between successive pours. 2) Eliminates concrete hanging on the reinforcing creating voids within the structure. If the piers were poured in one continuous pour then you will not have irregularities in the concrete. So check the...
  3. BFPartners

    Cracks in concrete

    Normal method of crack sealing is to use ports and pressure grouting the cracks. Most contractors know this method and you do not need to know the crack depth. Most crack sealers will specify the crack width.
  4. BFPartners

    Tank Slab

    A tank in the ground will not slide if there is equal soil loads on all sides of the tank. However, there is the possibiliy that the tank could float out of the ground (upward)when then tank is empty and a hydraulic pressure is surrounding the structure. A basement wall of a house will develop...
  5. BFPartners

    Structural Library

    You will probably start with numerous textbooks but as you progress through your EIT, you will find "gems" that have useful design data that can't be found elsewhere... start a collection of papers and misc design details. What I suggest as a Structural Engineer is to start by having the...
  6. BFPartners

    Movable Bridges

    The Mabey bridge builders are simialr to Acrow in panel style pre-eng bridges www.acrowcanada.com The world famous Gateshead Millenium Bridge was constructed by Gifford and Partners. www.gifford.uk.com There are numerous engineering firms in Canada that also can supply you with engineering...
  7. BFPartners

    Truck Live Load- Exterior Girder Design

    The definitions are the same for subdivision design... mountable curb = rounded curb barrier curb = square curb can be 6 -8" high or check New Jersey Turnpike Barrier (NJ DOT for more info).
  8. BFPartners

    When can personal project files be trashed?

    I completed a law course for professionals and this is how the courts are handling these types of cases... this does change from state to state and province to province but check with your local association.... Think about the term professional liability. A house should have no problems for a...
  9. BFPartners

    Cost of structural steel

    The costs are for general fabricated beam members such as W, WWF, S, C, and L sections(c/w copes and holes for end clip bolts). HSS and other tubing may cost more therefore try to avoid HSS when possible. For plates, remember most steel sheets are supplier in a 4 x 8 or a 3 x 6 sheet size and...
  10. BFPartners

    When can personal project files be trashed?

    I do believe that a normal prof liability is 7 years from the date of the found deficiency. A book covering the topic "Law for Professional Engineers" explained that a problem found at any time plus 7 years can be brought to court. The question is "As a professional, what is the anticipated...
  11. BFPartners

    Specialty engineered items, calculations and submittal review

    When we submit the calculations to the client, we are of the assumption that the calculations will be passed on to the next firm performing work on the item. Second, this is a reassurance to the client we didn't accept his work and not perform any calcualtions, that is, a due dillagence has been...
  12. BFPartners

    Cost of structural steel

    Currently the price for structural steel is approx $0.75/lb CND or $0.63/lb USD. Last year the prices were: $0.50/lb CND or $0.41/lb USD The best bet is to call a supplier and get the price. Currently a large amount of scrap steel is being shipped to China which is driving up prices for...
  13. BFPartners

    Steel Bowstring Truss Design

    You might spec that the truss installation requires an engineer or inspector to be on site during installation/ removal from the truck. You should perform an inspection before the trusses are raised into the air to ensure no damage to the trusses. I know of many cases where the trusses are...
  14. BFPartners

    bolt and weld connections

    Things to remember... Shop welding is always cheaper and easier and higher quality than field welding. Steel errectors like bolted connections. Field weld when required such as moment connections or for items such as roof truss to shoe connections. Welders have to lug around heavy welding...
  15. BFPartners

    Basketball Court Slab on Grade

    The soils (clays) in Winnipeg swell under moisture and you could experience unwanted cracking. Use the recommendations in CSA 23.1 and A23.2 for maximum joints in slabs and floor flatness numbers. The question becomes if you are trying to stop the cracks then you must use 0.002Ag or if you are...
  16. BFPartners

    Reinforcing on Concrete Blocks Walls?

    The wall design is based on the bar in the middle of the grouted core since the positioning will be unknown. Think conservative. Most walls are designed spanning to the floor slab and roof decking in a simply supported design. Alternatively, the wall can be designed as a cantilever from the...
  17. BFPartners

    Shear Walls - no OSB on a residential wall

    That is one scary cost savings measure... So what will prevent the wind from cracking the stucco and styrofoam? Where is the strength in that wall?
  18. BFPartners

    Frost depth

    Up here, frost goes down to 8 ft in ditches/fields and up to 11.5 ft under roads. Frost suseptable soils are not solid enough due to water expansion and soil movement which can cause structural damage. Most soils experience somesort of soil freeze/thaw action in the spring time due to warm...
  19. BFPartners

    "at rest" vs "active" earth pressure

    Hopefully I can help clear the air on this subject. Passive pressures result when the wall rotates into the retaining soil. Active pressures result when the wall rotates away from the soil mass. Both conditions require shear planes to form within the soil mass (ie the soil must plasticize)...
  20. BFPartners

    Bad idea - second opinion

    The orignial building probably was constructed without an engineer review utilizing Part 9 of the NBCC. Be cautious with expansions. As you mentioned, you might find out that there are moments generated within the slab (below the strip footing placed above the slab on granular). These moments...

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