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Recent content by SamETABS

  1. SamETABS

    Two way slab deflection, ACI 318-08

    Dear All, As per commentary clause "ACI 318-08, R9.5 — Control of deflections" if you satisfy the minimum thickness requirements of clauses 9.5.3.1, 9.5.3.2, and 9.5.3.3 there won't be any need to control deflections!!! firstly, What sort of deflection it is referring to? immediate, long term...
  2. SamETABS

    Lateral sway of Vertical Bracing and Moment Reisisting Frame

    Hello All, Do you know any shortcuts (prefereably Graphical Solution) to calculate the lateral sway of Vertical Bracing or Moment Reisiting Frames in low/medium rise buildings? I know I can calculate it with "Virtual Work Method" but this can be lengthy! Many Thanks,
  3. SamETABS

    Steel Truss-Chord Splicing Location

    Thanks all for your quick response: @a2mfk: so you think, I should put them near the end of each panel(say less than a foot)? @MiketheEngineer-: yes, the top chord is loaded (unifromly), so there ould be bendng moment on top chord member, so I presume I need to get it closer the area with less...
  4. SamETABS

    Steel Truss-Chord Splicing Location

    Hello All, I'd be grateful if you share some ideas regarding the best locations to introduce splice for bottom and top chord of a steel truss. Many hanks,
  5. SamETABS

    Floor Plate in Lateral Stability Model

    StructuralEIT, Just to add to valuable posts by WillisV and hokie66, if you build two models; one with floor plates included and the other one w/o floor plates; you will notice from reading the axial force in the peripheral columns that in the first model (i.e. floor plates included)you will...
  6. SamETABS

    Floor Plate in Lateral Stability Model

    WillisV, Thanks for your response. I was actually wanted to point out this phenomenon at the beginning of my thread, that when you define floor plates, it starts to engage peripheral columns as outrigger action and stiffening up the building. 1) I agree with your approach as to design the...
  7. SamETABS

    Floor Plate in Lateral Stability Model

    StructuralEIT, I apply the lateral loads on Diaphragm CM, either wind or seismic. I've also attached a section from "Reinforced Concrete Design of Tall Buildings by B. Taranath" that emphasizes on modelling the floor...
  8. SamETABS

    Floor Plate in Lateral Stability Model

    StructuralEIT, Thanks for your post. Since, the plates are modelled as shell elements, their presence in 3D model will enhance the lateral stiffness of the tower. I have set up two models: i)frames and shearwalls (i.e. w/o any fllor plate), which are part of the lateral stability system...
  9. SamETABS

    Floor Plate in Lateral Stability Model

    Dear All, I'm doing a lateral stability study on a 40 story building. Should I model RC floor plates in the lateral stability model? I know that there would be a beneficial effect by including the floor plate on lateral sway of the tower. But, is it a logical thing to do? many thanks.
  10. SamETABS

    Rigid-Ended Beam Element

    Kellnerp, ETABS specificaly for structural engineering modelling . But, any general idea would be hlepful as well. thanks.
  11. SamETABS

    Rigid-Ended Beam Element

    Hi Guys, I am sure you've come across coupled shearwalls. Does anybody have any idea how to model spandrel beams which couples the shearwalls by use of Rigid-Ended Beam Elements? many thanks, Sam
  12. SamETABS

    Shaking Table Test Model

    Hi Guys, As you might be aware, the recently designed SWFC (Shanghai World Financial Centre) Tower and CCTV tower in shanghai and beijing, have been studied through 1:50 and 1:35 scaled models on shaking table to predict a more realsitic behaviour of these structures under the earthquake. I was...
  13. SamETABS

    Through-Bolt Design

    Asixth: thanks for the comment. What code r u using? paddingtongreen: the main technical authorities would be ETAG001, Annex C, ETA-02/0042 But gents the main issue is defining the modes of failure. HILTI and other technical literatures discuss mainly about partially peneterated anchors (as...
  14. SamETABS

    Through-Bolt Design

    paddingtongreen, my apology, it was a typo. it should be 30 mm.
  15. SamETABS

    Through-Bolt Design

    Hi Gents, I am trying to design a 300mm Diam. through-bolt which penetrates through 200mm THK reinforced concrete wall and it is under both axial and shear force. The checks that I am trying to apply are as follows: 1-Concrete bearing capacity ----> not sure how to calculate it for a...
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