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Lateral Earth Pressure using Hydrostatic Pressure

bharathv23
I am modeling a basement structure in which I had to apply lateral earth pressure on the basement walls. The symmetrically opposite walls were modeled using plate elements with the same orientation. I used hydrostatic Pressure to apply the lateral load on the wall. But as the earth Pressure acting on the opposite wall is opposite in direction I had to change the sign of the values of pressure. But I see that the STAAD V8i does not accept this hence I had to reverse the orientation of my plates and then apply the pressure which finally appears as shown in the figure attached. While such limitation was not present in the previous versions of STAAD like STAADPro 2006, why is that STAAD V8i has this Limitation. Also this renders the option of choosing global axis to apply pressure useless as we can only apply pressure in positive loacl Z direction of the plate. Hence I think I may be missing something. Please help me a to find a better way of applying the loading without having to reverse the orientation of plates.
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  • I had no problem to assign plate pressures, hydrostatic pressures, or general trapezoidal pressures to plates in the negative Local Z direction using the latest release of STAAD.pro, 20.07.07.19.

    Perhaps it was something we fixed since the version you are using, or perhaps you are creating the loads some other way.



  • in reply to Seth Guthrie

    In STAAD.Pro V8i Build 20.07.07.19, in the Revision History document, you will find the following description for an error that has been corrected.

    1. What's New in STAAD.Pro V8i SS2, Build 20.07.07 ( 12 October 2010)

    -------------------------------------------------------------------

    (B) Issues addressed in the Pre-Processing Mode (16)

    ------------------------------------------------------

    B) 03 The GUI has been updated to improve the ability to apply trapezoidal and hydrostatic loads on

    plates.  Previously where the force W1 is 0 or negative and W2 is non zero, then only one row

    of plates was being loaded.

    So, you need to install 20.07.07.19 to get it working correctly.

  • in reply to SKLose

    Dear Mr. S K Lose

    Thank you very much for the information. We have been using STAAD Pro V8i SELECT series 1, 20.07.07.35.

    I think I should be asking my company officials  to check with STAAD if they can provide any free update. Either way, I treid using STAAD 2006 an older version whose license we fortunately still have and was working fine.

    Bharath V.

    Assistant Engineer

    CES India Pvt. Ltd.

  • Offline in reply to SKLose

    Mr SKLose /  Mr Seth Guthrie,

    I am using STAAD.Pro, 27.06.23

    I have had problems using hydrostatic pressures on inclined wing walls.

    I think hydrostatic pressures can only be applied as long as you have a rectangle or square plate elements.

    Consider an inclined wing wall modelled as plate elements. The earth pressure at the top wall is always zero and will increase downwards p=γ.z, for z=0 then p=0.

    If in this version of program you want to apply hydrostatic pressures the earth pressure at the top of wing walls won’t be zero.

    I don’t know if this limitation is still the case in build 20.07.07.19?

    Please clarify.

    babmou

     

Reply
  • Offline in reply to SKLose

    Mr SKLose /  Mr Seth Guthrie,

    I am using STAAD.Pro, 27.06.23

    I have had problems using hydrostatic pressures on inclined wing walls.

    I think hydrostatic pressures can only be applied as long as you have a rectangle or square plate elements.

    Consider an inclined wing wall modelled as plate elements. The earth pressure at the top wall is always zero and will increase downwards p=γ.z, for z=0 then p=0.

    If in this version of program you want to apply hydrostatic pressures the earth pressure at the top of wing walls won’t be zero.

    I don’t know if this limitation is still the case in build 20.07.07.19?

    Please clarify.

    babmou

     

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