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Recent content by ATOOMUS

  1. ATOOMUS

    Function Damping Ratio?

    Hi, It may use to redefine response spectrum if damping ratio isn't equal general assumption ( 0.05 ). Try it, Best regards, Atoomus
  2. ATOOMUS

    dual system

    Hi, I think Choose Dual System Order isn't more effective than released columns to ignored lateral moments effects. Try it may be useful Best Regards Atoomus
  3. ATOOMUS

    a technique to model a beam supporting slabs from 2 different levels

    Hi, Use two separate beams on two different levels then use supper-position method to collect internal foreces or stresses. Try it then send me your results and conclusions if u can do.
  4. ATOOMUS

    Concrete Shear wall with multiple openings

    Hi, Use door and window draw tools then use reshape object order to modify it.
  5. ATOOMUS

    Gravity members participating in mode shapes

    Hi, all steel columns can release to ignored lateral moment resistance effects. So, all wall becomes the main lateral moment resistance system. (shear wall system) Try it then send me your results and conclusions if you can do. Best Regards, Atoomus
  6. ATOOMUS

    EIGEN VALUE OR RITZ VECTOR?

    EIGEN VALUE OR RITZ VECTOR - RITZ Vector is more quick than EIGEN VALUE but at a large numbers of modes as larger than 250 modes may be become unuseful. So, you must lead to incrase manual meshing for elemens which may usally lead to acheive 90% of the building's modal mass participation. - If...
  7. ATOOMUS

    design of beam in etabs

    Hi, I am Eng. Mu'men Atoom from Jordan. I studied this case. I saw: - when we have solid slab ( slab on drop beams ), we must use membrane slab because it is more accurate than shell slab. ( membrane transfer loads from slab to beams by tributary area method then from beams to columns). -but...
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