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  1. alphaxy

    Seismic Load path (Static & Dynamic)

    dgillete, you mentioned, stiff springs. I am thinking if this idea might be correct. what I will do is obtain the value of passive pressure and load it as spring K value. So for example..The earthquake forces is going to the right side (Active static + dynamic soil pressure, hydrostatic...
  2. alphaxy

    Seismic Load path (Static & Dynamic)

    dgillete, That is really great. Im doing figure C now. There is a soil extending at full height of wall in left most side and a lower level of soil (2.4 meters) offset from topmost height of wall in right side. I forgot to tell you that there is a beam that frames the walls and a superstructure...
  3. alphaxy

    Seismic Load path (Static & Dynamic)

    Ishvaag, what is CFD? If the structure will head toward in "say" positive X direction..how will the soil react to this loads considering the static forces of soil only. (say let us ignore first the seismic effect of soil) I am not sure if the passive force will be true at this point..as...
  4. alphaxy

    Seismic Load path (Static & Dynamic)

    Sirs / Mam's, Great day to all! I need your help..I need a brilliant idea with the attached file that Im dealing with right now. I have this confusion that you may have the idea of what is the correct approach In figure A, the normal pressures of static soil pressure and water pressure were...
  5. alphaxy

    Plate centre stress governing design moment

    STAADicEquilibrium, Thank you very much..You made it clear..=) What I did in my analysis is I used 20kN/m...my mesh size is all less than 1 so I guess I am in conservative side. The moment is dependent on size of mesh, and if we have a wall with mesh size of 0.65, 0.7 and 0.8..we can make use...
  6. alphaxy

    dynamic effect of rotating / vibrating equipment

    fellows, I would like to ask if the propeller-like at the bottom of the equipment (attached in this thread) should be considered in designing the platform shown in the picture? Do you have any guideline how to consider vibration in design? Happy Holidays Regards, AlphaXY
  7. alphaxy

    Vibrating Equipments 1950's

    diskullman, Thank you very much. As per attached picture, Is 5000lbs possible for this equipment? In the picture in their website, it seems very small (around 500mm to 1m in size longitudinally) and this seems to be just the motor. The equipment I have attached in this thread is huge around 5ft...
  8. alphaxy

    Vibrating Equipments 1950's

    Fellow Engineers, I have this 3 types of equipments which is placed in a table top which is constructed in the midst of 1920's and 1950's. I was task to design the table top, unfortunately we do not have any vendor data (weights, speed, etc.) Here are the equipment models found in the machine...
  9. alphaxy

    Peak Ground Acceleration

    Fellows, I am having a confusion with the PGA issue. Our Geotechnical contractor submitted a report to us for a particular project where the engineer in charge stated a value of 0.52g The peer reviewer keeps on asking in our meeting about the value we have used for Ca = 0.44Na = 0.44(1.2) =...
  10. alphaxy

    Plate centre stress governing design moment

    Sirs, I am confused with the design moment for plates in STAAD. When STAAD generate bending forces, it gives kNm/m. say my mesh would be 0.65m and a 20kNm/m. Does it mean that I have a design moment of 13kN/m? "OR" Use 20kNm, and when you obtain rho from equation Mu =...
  11. alphaxy

    Beam on top of wall

    Sirs, With the detail I provided, is the wall should be assumed pinned to beam?
  12. alphaxy

    Beam on top of wall

    InDepth, The structure is above the ground. The columns is on top of the basin. I assigned pin condition in walls of the concrete basin. It is continuously supported in every mesh of the walls (bottom only). I assigned spring supports in walls for the soil resistance. I used foundation support...
  13. alphaxy

    plate in tenion

    forsythr88, use dummy lines. be sure to zero the value of density. =) AlphaXY
  14. alphaxy

    Failing Members!!!

    What version are you using? Is it pirated or original copy?
  15. alphaxy

    Plate centre stress governing design moment

    Thanks Julianhardy Is the strip width you are referring to, depends on the mesh of plates in STAAD? Or just the normal assumption we used to do when we design slab (which is always 1 meter strip)
  16. alphaxy

    Beam on top of wall

    JAE, yes I understand your point and I absolutely agree with that but how is that happening, I have a wall in my model, have it meshed and the beams were also cut into length of each mesh, how come it absorbs moment in strong axis? what I cannot understand is my model in staad do not take into...
  17. alphaxy

    Beam on top of wall

    Guys, Thanks for your comments and suggestions, it really helps a lot. Btw, Is it possible to have a bending moment in major axis of beam? I pressume that It should not carry Mz because of the existing wall below, but it does. And torsion is very significant. Do I need to release the out of...
  18. alphaxy

    Plate centre stress governing design moment

    Fellow Engineers, I am modelling a concrete slab using plate elements. I am looking for the moments in the slab at the center of each element. I noticed that the output gives the bending moments per unit width. What is the per unit width? Would that be the thickness of the plate element? I...
  19. alphaxy

    Beam on top of wall

    Cont.. Or I may analyze the wall as a retaining wall. Lots of solutions, playing on my head. just don't know where to start and what is the correct approach.
  20. alphaxy

    Beam on top of wall

    Jae, That is a great idea. I thought of that too. I was thinking if the beam could be a part of the wall already as it might be a thickening part of wall to take into account the local stress of column on top. As I observed the water on site, it is possible that the water may reach the top of...

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