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Ayesha

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Everything posted by Ayesha

  1. Ayesha
    Location of base is always confusing and this article provides excellent insight.
  2. Ayesha
    Probably.. thats one of the reason. Other reason being that engineering drawings mostly show it that way.
  3. Ayesha
    Graphic calculator wouldn't be very useful. I would suggest a good book would make a good gift.
  4. Ayesha
    To add to this, Minimum thickness above bottom of concrete reinforcement prescribed for concrete footing is: Reinforced Concrete Footing on Soil: 6 inches (Section 15.7) Reinforced Concrete Footing on Piles: 12 inches (Section 15.7) Minimum Thickness of Plain Concrete Footing on Soil: 8 inches (Section 22.7.4) Plain Concrete Footings on piles are not permitted (Section 22.7.3)
  5. Ayesha
    Not the geotech design. PCACOL would do the structural design only.
  6. Ayesha
    It is explained in the manual that you can download from http://www.sepakistan.com/topic/1322-how-to-design-t-or-l-beams-in-etabs/ I have also attached the snapshot from the manual that explains how Etabs checks beam column capacities.
  7. Ayesha
    Do you want geotechnical design of steel pile or structural design of steel pile?
  8. Ayesha
    You are welcome
  9. Ayesha
    Walikumasalam DFX is a neutral file format used to interchange data between softwares. It shouldn't make any difference even if you use older versions of AutoCAD.
  10. Ayesha
    Good points being raised. Let me also clarify that my answer was with the assumption that only bottom cord of truss is supported on beam. If there is a horizontal reaction at pinned end then that would result in some torsion(reaction *distance to top of beam) in supporting beam. The action of wind + snow can result in uneven snow distribution of one side of the structure(if the area is considerable enough) resulting in substantial snow load. There is a good reference in book called "Why buildings fall down."
  11. Ayesha
    What is your wind load? Wind load would be more critical for your truss design than snow load provided you don't assume a very high snow load. Umair has mentioned good points here. Do note that the beam end supporting pinned end of truss would have torsion in it . The end with slotted hole will create no torsion in the supporting beam.
  12. Ayesha
    This depends upon what does your building code says and how do you establish your design criteria. Follow your firm's practise unless you have very good reasons not to do so.
  13. Ayesha
    I don't have access to any softwares so I don't know about your framing. But, for Steel Design, don't model 2D unless you are completely familiar with the overall process. Generally, steel columns(I shapes) can be moment connected in the major axis and braced in the minor axis to provide a load path for lateral loads. You should see what you column orientation is. Unlike concrete, for steel design, you have be watch the load path. Engage a senior engineer in your office and get him to review what you are doing.
  14. Ayesha
    I don't know above newer versions of ETABS but SAP2000 has the capability. You need to input time dependent properties and see how your results change. Attachment gives some information. the-structural-design-of-almas-tower-dubai.pdf
  15. Ayesha
    Draw your slab in ETABS. Select and move to the desired vertical level.
  16. Ayesha
    Height of building that you are analysing?
  17. Ayesha
    Attach your calculation and basis of calculation. Like Umar said you don't even need comparative study. Its obvious that new Saudi Code based on IBC will give higher base shears.
  18. Ayesha
    Share your model. When you say you didn't get satisfactory results, what is the basis for that ? Have you done any manual comparisons ? Share any framing images that you have .
  19. Ayesha
    Should be in your text book.
  20. Ayesha
    The UDL at top of slab is the dead weight of slab and any live load. http://www.sepakistan.com/topic/16-rectangular-concrete-tanks/ has a document attachment that shows what UDL should be for each boundary condition case. Referring to the title of thread, you can use this document to design Top Slab, Walls, And Bottom Slab Of Under Ground Water Tank as long as wall panels are expected to behave in a two way bending pattern.
  21. Ayesha
    Do you have any information about where to study for the exams that are taken by Atomic Energy ?
  22. Ayesha
    You should share your floor plans to give an idea of what you are trying to do. It will help others look for solution other than what are proposing.
  23. Ayesha
    Use the cover values specified in the building code you are using. Make sure you have the same clear cover as specified in code for beam, column or shear wall.
  24. Ayesha
    Material non-linearity would effect value of "EI" and would result accordingly when calculating the center of rigidity. Similarly, Second degree analysis would effect to the extent of change in EI value as calculated for the of Center of Rigidity. My answer is just the mathematical explanation of equations solved for center of rigidity.
  25. Ayesha
    When you say end bearing, do you mean "belled piles" ? or "end bearing" with straight shaft piles ? What pile diameters are you expecting ?
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