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  • Users: weab
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  1. weab

    Sewage Specific Gravity

    Hello, I am a structural engineer trying to design a sewage holding tank in a seismic zone. I'd like to know the specific gravity of typical of the combined fluid with solids, not just the solids. This fluid would be pumped into a tank just outside the restroom of an underground mine. This...
  2. weab

    Is geotech report Spectral Acceleration the same as IBC value Sa?

    Hello, I am not certain if this is best in this structural forum, seismic formum, or geotech forum, so I apologize in advance for this placement. I am trying to interpret a geotechnical report from a few years ago at a mine site in SE Asia. We are designing using IBC and ASCE 7 codes. This...
  3. weab

    Using less than minimum prescribed fillet weld size

    I know what the code says for minimum weld size. It indicates minimum fillet legs to assure quality welds and “ductility”. (I'll admit that I can't see the need for ductility in weld material, but that's what my references and AISC indicate is required of a weld.) Is there any other way to...
  4. weab

    RISA plate spreadsheet results don't match graphical output

    I have noticed this several times in doing FEA in RISA. I graphically show the Von Mises stresses using the contours option on the screen and notice the highest stress indicated by colors. Then I look at the plate stresses in the spreadsheet output and sort max to min. The highest stress is...
  5. weab

    Designing Rock Anchors

    I have been doing work for a mining company for quite a number of years. The site engineers are steadily doing less and handing more over to us, an engineering consultant. I have been doing some inconsequential rock anchor designs with little loads. The client likes wall plates with 2 or 4...
  6. weab

    Designing Rock Anchors

    I have been doing work for a mining company for about 10 years. The site engineers are steadily doing less and handing more over to us, an engineering consultant. I have been doing some inconsequential rock anchor designs with little loads. The client likes wall plates with 2 or 4 rock...
  7. weab

    Seismic Design Underground

    I soon expect to be designing an underground building, small but possibly 2 stories high. The buildings are usually close to walls (ribs), often in corners. The client is OK with continuing deck framing at the column rows in order to attach to the rock walls using rock anchors. If I do this...
  8. weab

    Seismic Loads on Bin Walls

    I have to design a bin with copper ore. I can calculate the static loads as per Gaylord & Gaylord. And Gaylord and other references even mention how to design the overall support structure for seismic. However, nothing is mentioned regarding the design of the bin wall to account for material...
  9. weab

    AISC 9th edition vs. 13th edition

    My company uses 9th edition, Allowable "Stress" Design and not 13th edition Allowable "Strength" Design. Our work in the petro-chemical, offshore, and general industry usually means that time is more important than saving 10% steel weight. We must order steel often before sizes can be...
  10. weab

    Design of Tee Section using AISC ASD 9th ed

    I am trying to design a Tee section in bending using AISC 9th ed. It does not really seem to be covered anywhere. It is bent about the strong axis (in plane of the stem) and the stem is in tension. Where is it in the code? Use Section F3? I've seen somewhere that a Qs factor is important...
  11. weab

    Seismic Design of Bin / Hopper with Bulk Material

    I'm designing a bin (or hopper or bunker, whatever you want to call it) on top of a braced frame tower. I know how to design the tower for UBC. However I may do a simplified design or a finite element analysis of the bin itself. I have rock inside a rectangular bin. Does anyone know of a...
  12. weab

    Jam Nut with insufficient thread

    I have an anchor bolt subject to tension. I have enough thread for a single nut but not enough to engage the entire second nut. This is a 90mm diameter anchor bolt and I have about 75mm available for the second nut. I don't want to weld to the anchor bolt in lieu of a jam nut. Is there a...
  13. weab

    IBC - Earthquate design outside U.S.

    The latest project that I'm working on is in a remote, undeveloped region in Indonesia. We'd like to use the latest code, IBC 2003. However, there are no Ss & S1 charts for earthquake design, and our client will never spend the money or time for the incredible amount of research that would be...

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