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  1. StructLin

    Crushed stone size limitation for non-expansive frostfree fill

    CarlB, Thank you very much. Yes I vaguely remember in a thread talking about 3" (or 5") maximum crushed stone diameter. So it is probably 3" is what I have seen.
  2. StructLin

    Crushed stone size limitation for non-expansive frostfree fill

    Hi, Guys, Need help here. I remember there was a thread before, which discusses about the crushed stone size for use as non-expansive frostfree fill. But I can not find this thread now. Can anybody direct me to that thread or tell me what is the max./min. crushed stone size for non-expansive...
  3. StructLin

    Crushed stone size limitation for non-expansive frostfree fill

    Hi, Guys, Need help here. I remember there was a thread before, which discusses about the crushed stone size for use as non-expansive frostfree fill. But I can not find this thread now. Can anybody direct me to that thread or tell me what is the max./min. crushed stone size for non-expansive...
  4. StructLin

    A 90mph gust windefinition is last how many seconds?

    I think a wind with 90mph last for several hours will cause much larger damage than a wind of 90mph just last for 3s. Are they still have the same rating?
  5. StructLin

    A 90mph gust windefinition is last how many seconds?

    So how do we rating a wind which stays at 90 mph for a long time (>3s)?
  6. StructLin

    A 90mph gust windefinition is last how many seconds?

    I got a customer enquiring about a 90mph (or 100mph) gust definition. His question is how long this 90mph gust last will be defined as 90mph wind. 3s? or 5s?, can anybody help me to answer this question? Thanks
  7. StructLin

    Does AISC 13th Manual still allow 10% negative moment reduction?

    We usually reduce 10% negative moment in continuous W shape beam in our past design projects, which is allowed per LRFD Section A5.1. Now our company is going to change to use AISC 13th. I am not sure if it is still allowed to have this 10% reduction in negative moment. I can not find the same...
  8. StructLin

    Steel Plate to increase Concrete Beam Capacity

    YS, I have calculated the shear force for you based on 250mm center. My result is 57.1 kN at 250mm center. Please see attached pdf file see if there is any mistake.http://files.engineering.com/getfile.aspx?folder=7f8a61de-b92e-4f24-91b7-62aa43d0f997&file=Steel-Plate-Under-Beam.pdf
  9. StructLin

    What is transfer Pt. Wher does it locate?

    I am reading PCI Design Handbook, Example 4.2.2.2, in the Table, there is a "Transfer Pt.at release P=Po". Is "Transfer Pt." means Transfer Point?. How to determine its location? Thank you very much for your help.
  10. StructLin

    Lethbridge, Albert, Canada basic wind speed

    Need help please, can anybody help me to find the basic wind speed in Lethbridge, Albert, Canada? I need work on a project over there. ASCE7-05 only gives US basic wind speed map. Thank you very much.
  11. StructLin

    MWFRS Question

    My understanding is that in the real world, in one enclosed space, internal air pressure will either in outward pressure or in suction. No such thing as one wall outward, another wall suction, which is against natural law. If there is two room, it is possible that one room in outward pressure...
  12. StructLin

    Fixed or simply supported boundary condition.

    Good Point. I think miecz gives an accurate analysis method. While SlideRuleEra gives an quick estimation method. Thank you both very much.
  13. StructLin

    Fixed or simply supported boundary condition.

    Suppose this bearing length is very small, say only 0.5", and weld is only tw=5/8", weld leng is only 2 of 1/2" (just imagine an example), does it still reasonable to consider it as fixed boundary? or you have to prove your weld will not fail?
  14. StructLin

    Fixed or simply supported boundary condition.

    A 5" width, 1" thickness, 12" clear span plate, exerted a load P. I guess most people will consider case (a) as simply supported boundary condition, and case (b) as fixed boundary condition. My question: is there any statement in any code which can justify above assumption? Should there any...
  15. StructLin

    Why use different moment of inertia in deflection calc in ACI and PCI?

    Now I need to calculate the deflection of a building floor. The floor is a 9" thick slab, sitting on 20' spacing column in one direction and 22' spacing column in other direction, all column is 20" square. Total factored load are given as "w" (psf). My question is: 1. Should I Add column strip...
  16. StructLin

    Why use different moment of inertia in deflection calc in ACI and PCI?

    ACI and PCI basiclly deal with same material, i.e. concrete, why in ACI, Ie=0.35Ig or 0.25Ig is used in calculating the member or slab deflection. While in PCI, the gross Ig is used in calculating the member or slab deflection? That makes no sense.
  17. StructLin

    How to use Table3-22b in AISC 13th edition?

    Thank you JAE and JaredS, Now I can figure out how to use this table.
  18. StructLin

    How to use Table3-22b in AISC 13th edition?

    Table 3-22a and Table 3-22c are quite straight forward and easy to understand how to use. But Table 3-22b is not. Its title is "Beam Diagrams and Formulas, Design Properties of Cantilevered Beam-.....", but I do not see any cantilevers, all the diagrams are showing statically inderminate simply...
  19. StructLin

    How to use Table3-22b in AISC 13th edition?

    Can anybody tell me how to use Table3-22b in AISC 13th edition? I will appreciate it very much if somebody can give an example showing how the Table3-22b in AISC 13th edition is used. Thank you very much in advance.
  20. StructLin

    How to calculate shear and flexural strength of hollow precast beam?

    I am involved in a project using hollow precast beam. But I am only familiar with reinforced concrete beam. Can I treat it the same way as concrete beams? How should I deal with those hollow holes which go through all the whole beam length? Can you please also recommend me some good design books...

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