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  1. precast78

    Retaining wall to retain liquid

    LittleInch, JStephen's sketch is accurate except the client wanted the precast piece sitting at grade (not possible). So I am proposing what JStephen sketched. It will be buried 6 to 7 ft.
  2. precast78

    Retaining wall to retain liquid

    So if I use JStephen's sketch. Do I need to subtract any buoyancy force?
  3. precast78

    Retaining wall to retain liquid

    Yes, exactly what JAE said. It seems impossible to make it work with a precast. The liquid can go as high as 10 ft. I have to make the precast so big if I can't use the vertical load from water. The only way I can see we can do it is if they put soil on the other side almost all the way to the...
  4. precast78

    Retaining wall to retain liquid

    At first when I did the overturning calculation and the sliding calculation, I added the weight of the water above the heel like if I was designing it to retain soil. But the more I think about it, I feel like I should not. If I do not add the weight of the water, it seems impossible to do...
  5. precast78

    Load combination question

    You put .6D of whatever that will "HELP" your design.
  6. precast78

    How to design polymer?

    Is there a manual or standard code on how to design structural plastic?
  7. precast78

    One-Way Slab (Suspended Slab) With Metal Deck Design under Wheel/Vehicle Loads

    Equation is just there so you do not have to use finite element analysis. Or just go ahead and use finite element analysis and apply the load per tire patch.
  8. precast78

    One-Way Slab (Suspended Slab) With Metal Deck Design under Wheel/Vehicle Loads

    I would distribute your wheel load to e width according to AASHTO LRFD 4.6.2.10. On the side edge of the slab, you should reduce this e width. Dont forget to add impact to your factored load.
  9. precast78

    Constructability of a 6" Concrete Wall

    Don't people use self-consolidating concrete nowadays?
  10. precast78

    How to design polymer?

    Yes, it will have glass in the plastic. So what shall I design it to? 25% yield? What safety factor shall I add on the top of that?
  11. precast78

    How to design polymer?

    Hello, I was assigned to help design a small plastic structure. My background is more in concrete. I modeled the structure using FEA. The structure will be buried and loaded with soil cover and vehicle load. My questions are the following: 1. What shall I use as my limiting factor? Shall I...
  12. precast78

    ACI 318-11 Shear Reinforcement

    Cooper thanks! So basically 11.4.7.5 is a reduction even though inclining the rebars will make it more perpendicular to the shear crack? How do you do 11.4.7.6?
  13. precast78

    ACI 318-11 Shear Reinforcement

    It is very hard for me to understand chapter 11.4.7.5 to 11.4.7.8. Do you guys have a sketch or photograph what these look like?
  14. precast78

    Retaining Wall - Location for taking Moments (Key on resisting side)

    If you extend the active pressure all the way down to the bottom of the keyway, you will realize that adding keyway will not do anything for taller walls.
  15. precast78

    Shear on simply supported beam

    rb1957, what if the beam is 2+ ft deep?
  16. precast78

    Sap 2000 for FEA question

    You have to draw the meshes manually.
  17. precast78

    Shear on simply supported beam

    Guys, I am having another engineering discussion with my coworker. Let's say you have a concrete beam simply supported 10 ft long. You have 10 kips factored point load that can be anywhere on the beam. The beam has 12" d distance. What Shear load would you design the beam for? Let's neglect...
  18. precast78

    Retaining Wall - Location for taking Moments (Key on resisting side)

    I just recently finished an excel spreadsheet. I personally did the sum of moment at the toe instead of the key. This way it is easier to do the formulas when you want key or no key. I also believe if you have a key, some of your friction coefficient will be higher because it is soil to soil...
  19. precast78

    Custom plate washer to increase Appendix D capacity

    On appendix D, the ANC is calculated from the center of the bolt. If I add a thick custom washer, is there a way to increase this number? I feel like my ANC should be higher? Does Appendix D cover this anywhere?
  20. precast78

    Steel Baseplate for a Wood Column?

    I am just really interested with this subject. If I was to put a column on a slab (new construction), what do I need to do? How do I design it?

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