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  1. Canada580

    closed airtight container and corrosion

    Hi TugboatEng. Its just a liquid container which is not allowed to freeze and can be use in vibration control of structure.
  2. Canada580

    closed airtight container and corrosion

    Thanks EdStainless. Please see my below comments in red on your questions: will you please comment further So is there a loop that this fluid circulates through? No the same fluid will be there all the time. Are there any other metals in that loop? No You need consider everything that the...
  3. Canada580

    closed airtight container and corrosion

    Thanks a lot TugboatEng. We use to galvanize all the steel we use in our application. Two small questions: 1. What will be the mix ratio of carboxylic acid and water in general? in PPM ? 2. Does antifreeze will have any role in accelerating corrosion in the closed container ? Thanks
  4. Canada580

    closed airtight container and corrosion

    Hello, I would think the corrosion rate is very low in a closed airtight galvanized steel container containing liquid mix (40% water and 60% antifreeze (Ethylene Glycol)). The container can have 50% air and 50% the liquid mix or so. The tank size is about one meter cube and this needs to be...
  5. Canada580

    Damping measurement with Logarithmic decrement method - Excitation in both axis

    Thank you Josh. much appreciated! yes both direction recorded. In the attached excel file, I did the SRSS of two acceleration values. But the confusion is in sign (-ve or +ve) because SRSS will always be positive.
  6. Canada580

    Damping measurement with Logarithmic decrement method - Excitation in both axis

    I am trying to measure structural damping value (For the First mode of vibration) of a steel pole (pipe Section) with Logarithmic decrement method. When I excited the pole, the excitation axis is changing. It is mainly because the circular section have same stiffness about all axis passing...
  7. Canada580

    Cold formed stud wall - OSB panels on both sides - Shear Wall Type II - Capacity - AISI S240 or S420

    For Type II Shear wall with OSB panel sheathed on the both sides of the cold formed stud wall, Can we double the capacity and calculate as per the code that is mentioned for the Type I shear wall. The same clause is also explained in the commentary where it does not say for any specific Type of...
  8. Canada580

    Concrete Tension capacity utilization

    This may be silly questions but may not be at the same time. I want to use concrete tension capacity. Say, you have 1m diameter 30 Mpa concrete. Steel anchors at middle that load the pile into tension. The pile then resist load through skin friction with soil. Say the pile have minimum rebar...
  9. Canada580

    Screw pile foundation - minimum embedment depth requirement?

    I was thinking this depth of 3.5 m is not too deep to consider it as deep foundation.
  10. Canada580

    Screw pile foundation - minimum embedment depth requirement?

    Hi, I don't think there is specific emebedment minimum depth requirement for screw pile to work other than frost depth and uplift capacity requirement. But I am not 100%. I got a project, minimum torque specified was 80,000 ftlb and depth of installation was around 24 feet. But contractor was...
  11. Canada580

    Slab On Grade

    Thank you Dik. I am thinking to replace about 3 feet of the silt fill and replace with gravel compaction. Also, The shelter structure is steel frame. I do not see any major problem with some tilt.
  12. Canada580

    Slab On Grade

    I am also thinking to provide 2" insulation that provide R10. But not going to check freezing stuff. Though?
  13. Canada580

    Slab On Grade

    Thank you Canpro, KootK and Dik. It is for Winnipeg. Frost dept aroun 2.5 m. Air freezing index 3251 degree F. About 5 feet of silt and clay fill. I am thinking to replace about 3 feet of the fill and replace with gravel compaction. My bearing load is low around 30 KPA. 8 inch slab is good...
  14. Canada580

    Slab On Grade

    Thanks Hokie66, Yes. The frost heave could be hugging or sagging. I just assumed center upheaval because it gave me higher bending moment. As I can design the slab for maximum consideration, if bearing pressure is OK, do you think that the foundation should be frost protected ?
  15. Canada580

    Slab On Grade

    Thank you raspivey. I would consider all the weigh from the building on the pad. Then calculate bending moment with that cantilever action assuming slab will be supported at center only. If the upheaval force is more than building weight, the entire building will move upward. So the slab will...
  16. Canada580

    Slab On Grade

    Hello ! I have to design a slab on grade foundation for a small shelter. I have attached a sketch for this. The load due the shelter will be only around 30 KPa. If I design the slab for cantilever action that can cause due to frost upheaval, do I still need worry for some other stuff? It's no a...
  17. Canada580

    Maximum Stress on Shell element in Ultimate Limit State Design Method

    IF we design a plate based on ultimate limit state method, the stress on shell element with elastic model on SAP2000 can give higher stress value than yield stress. To compare design approach and modeling approach, may be we need to model the plate using layer nonlinear shell element. However...

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