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Recent content by jackyyau

  1. jackyyau

    Shell

    SAP2000 section cut may provide the resultant moment for a simple salb. But it fails to display the resultant or the figure when the cut is through shell elements of complex geometry for example a wall of a oval-shape shaft. Also the resultant is difficult to understand. From the shell...
  2. jackyyau

    Shell

    so we have done the shell anyalyses and obtained all the internal force resultants M11, M22, M12, V13, V23, F11 etc How to proceed to design the shell slab, wall orll-beam in accordance with the design codes like BS8110 etc? I found there is a gap between the design codes and shell analyses...
  3. jackyyau

    Wall Reaction Sign Convention

    In SAFE ver 7.01, the wall reactions can only be shown in tabular table and the wall reactions are in Global Axix direction. These are inconvient. Can the wall reactions be shown in graphic output and in local wall axis? How? Why I ask such a question? A circular slab is supported by circular...
  4. jackyyau

    Best quad mesh generation for SAP

    I am looking for guidlines on how to design the RC shells with SAP2000 shell element analyses output forces. It is noted that the resultant forces (M11, M22,M12, V11, V22, F11, F22 etc) from SAP analyses cannot be used directly for RC design in accordance with the design codes.
  5. jackyyau

    Gap NLink element

    In another software SpaceGass, compression-only members uses an iterative analysis method, SPACE GASS puts it into a slightly different category to the other non-linear effects and makes it available in either a linear or a non-linear static analysis. During the iterations SPACE GASS disables...
  6. jackyyau

    Gap NLink element

    Can someone please explain why SAP2000 need to activate Modal analysis (Ritz method) such that nonlinear Gap elements are effective. Please help!
  7. jackyyau

    Gap NLink element

    It depends on the connection details between the shelF and the wall. Without knowing the details, the Gap cannot be defined. Gap is a compression only spring, and SAP2000 provides an option to allow you to control when it come into functin by defining a real seperation (gap) between the Gap...
  8. jackyyau

    Gap NLink element

    I defined a Gap Nlink with stifness U1=1000kN/m. In nonlinear analysis, which direction is compression, +'ve local 1 axis or -'ve?
  9. jackyyau

    Design for Shear V13, V23 or Vmax of Shell

    the following lecture notes explin all about designing shell/plate structures based on FEA results: www.gtstrudl.gatech.edu/gtstrudl_new/GTSTRUDL_Users_Group_Newsletter/Presentations/2003/GTSUG2003_Tips&Techniques.ppt Thanks
  10. jackyyau

    Design for Shear V13, V23 or Vmax of Shell

    We are using SAP2000 nonlinear version 8.1.2. I still don't understand why the design moment is the sum of M11 and M12. How about the following: the reinforcement bars are arranged parallel to local 1-axis and 2-axis, do we still are add M12? I still don't understand the twisting moment...
  11. jackyyau

    Design for Shear V13, V23 or Vmax of Shell

    Does anyone have the Chapter 26 (as refered in help file) Manual discussing section cuts? Where can i get a copy? For design moments, can we simply add up M11+|M12| from M11 and M12 resultant diagrams? Could zer or someone help. ugoveri (Structural) 2 Nov 04 13:29 When drawing section cuts...
  12. jackyyau

    Design for Shear V13, V23 or Vmax of Shell

    I am designing a circular slab (with numerous openings, of course) fix-supported on a cylinder shaft. At the slab-wall interface, I am confused which shear force (V13, V23, Vmax or combination of V13 and V23) should be used for design. Anyone can calrify? (the slab thickness cannot be changed...
  13. jackyyau

    How to interprete the result of shell element

    can some explain V13 and V13, please?
  14. jackyyau

    Design a beam by using Shell elements!!!

    I am studying shells elements and need your help. How to design a beam with the SAP's shell element outputs, F11, F22 etc? see http://home.i-cable.com/jacky.yau/BeamDesignbyShell.tif The model: 12m span 1m x 1m x 0.6m thick shells area loads = uniform 100 kPa (global gravity) fixed at coners...
  15. jackyyau

    SAP Model with No Supports

    The case: A circular shaft subjects to underground water pressure (assumed uniform at a certain depth). Model: Plan circular shaft model with frame elements radial at 10 degrees (i.e. 36 elements total). The elemets are load with the uniform water pressure normal to the elements. No supports...
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