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  • Users: jackyyau
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  1. 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...
  2. 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?
  3. 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...
  4. 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...
  5. 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...
  6. jackyyau

    SAP 2000 ver 8.1 - out of memory?

    When I define many load combinations (over 10 combinations), there is an error that "SAP 2000 is running out of memory" and the combination already defined cannot be saved! Under the "Option" menu, we can set the values in memory, m1 and m2. But what are m1 and m2?? (in MB or kB)? Is there a...
  7. jackyyau

    SAP2000 ver Nonlinear 8.1.2 Default Unit

    Would anyone please advise: How to set the default units in SAP2000 ver Nonlinear 8.1.2 to SI units, such that each time I open a new model the units are by default in SI system, m, kN.. instead of in and kip. Also the accompanying kit, SAPTemplates.exe, which is good for building arbitrary...
  8. jackyyau

    Mesh Transition Shell

    Suppose a floor meshed into 9 by 9 shells each is 1m x 1m and a wall meshed into 6 by 6 shells each is 1.5m x 1.5m. In SAP2000 Version 8.2, how can the floor/wall interface shells be quickly meshed into a transition zone? I tried "mesh using seleted joints and on edges" but it did...
  9. jackyyau

    SAP2000 modelling of pad footing on rock

    Would one please advise how to model the foundation in SAP2000 for the follwing underground station: The station has a 2m thick base slab with side walls and tensile anchors (underneath the slab between side walls) to resist floatation. The base slab sits directly on hard rock. Questions: 1...
  10. jackyyau

    Compression only element/support (NLLINK-GAP)

    I am try to model a support, an element which is able to take compression only with the NLLInk GAP element, however it is found that the GAP element is able to take tension as well. Why?
  11. jackyyau

    BS8110: Design for Shear

    BS8110 allows shear capacity to be increased for the following two cases: 1. when the section being considered is near the support (increased by factor of 2av/d) 2. when the section is subjected to axial compression (increased by +N/Ac*M/V) My question is: when the section being considered has...
  12. jackyyau

    How to Analyse Railing Beam to Diaphragm Walls of Underground Station

    How to Analyse Railing Beam to Diaphragm Walls of Underground Box Station In Hong Kong, a 25m wide by 25m deep railway box station with 3 slabs (roof, concourse and base slabs) is to be constructed underneath a busy urban carriageway. The cross section: __Ground Level (0.0 mPD)...
  13. jackyyau

    Analysis of railing beam of underground Station

    How to Analyse Railing Beam to Diaphragm Walls of Underground Box Station In Hong Kong, a 25m wide by 25m deep railway box station with 3 slabs (roof, concourse and base slabs) is to be constructed underneath a busy urban carriageway. The cross section: __Ground Level (0.0 mPD)...
  14. jackyyau

    Inactive Members in SAP (Ver7.4)?

    As a SAP model grows bigger and bigger because of refinement of meshes, the time taken to draw the model become longer and longer. Is there a function in SAP (like other FEA softwares) which allows me to temporary swith off (inactivate) those elements which are not being refined such that the...
  15. jackyyau

    Missing Resultant of Shell Elements!?

    In a wall-slab deep underground station, the slabs have holes for escalators and vent shafts. The holes are arranged adjacent to one of the walls. Therefore, strong beams surrounding the holes are required to support the wall from bending inward. These beams surrounding the hole also prevent the...
  16. jackyyau

    What are the support conditions of shells?

    Can someone tell what the restraints should be applied to the edge joints of shell elements which are subjected to moments, axial and shear forces on the restrainted edges. xxxxxxxxxxxxxxxxxxxxxxxxxx (edge subjected to M, P and V) xxxxxxxxxxxxxxxxxxxxxxxxxx (edge subjected to M, P and V)...
  17. jackyyau

    Seismic Load on Underground Structures?

    For an underground multi-story basement structure, will the seismic load be citical to the design of the structure? If so, how the lateral quake loads be modelled?
  18. jackyyau

    Plate sub-model, your views? I

    Plate sub-model, your views? I have an underground reinforced concrete box station 16.5m wide by 35m deep by 280m long modelled by plane frame with SAP2000. The frame is 16.5m wide and 35m deep. The model is as follows: roof |--------| | | | slab1 | |--------| | |...
  19. jackyyau

    Analysis Incomplete!!

    I got a .s2k model exported from SAP2000 version 7.4 non-linear. This model runs well in Ver 7.4, however, when this .s2k inputs into Ver7.12 (SAP2000 NL), there is an error when SAP solves the model as follows: Analysis Incomplete!! Why and what goes wrong?
  20. jackyyau

    How to model limit the maximum force taken by a spring?

    SAP2000 is able to model supports as springs. But does SAP2000 allow the failure of a spring? For an example, if the spring is under tension and subjected to a force larger than its capacity, the spring breaks and the force previously taken by it will transfer to its neighbouring springs. How...

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