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  1. Ahmad Alhamad

    Dynamic Nonlinear Analysis (FNA) in ETABS

    Hello, I have 15 stories steel moment resisting frame exposed to Dynamic Nonlinear Analysis (FNA) in ETABS. When I defined Ritz modal, I have problem with the number of Ritz modes that I should define. Large differences in results have been obtained when I change the number of modes. In ASCE...
  2. Ahmad Alhamad

    Too close warnings

    Hello, when i export revit model to Etabs too close warnings appeared as shown in pictures. the warnings go away by dividing the beam at joints is this the logical solution ?
  3. Ahmad Alhamad

    beams cracking torsion

    Hello, I want to ask about cracking torsion when the member subjected to high axial force like tempreture then the term under the square root will be minus, so then what is this mean ? can i ignore torsion or the cracking torsion will be zero ? in ETABS the program calculate Tcr zero, is this...
  4. Ahmad Alhamad

    Beams cracking torsion

    Hello, I want to ask about cracking torsion when the member subjected to high axial force like tempreture then the term under the square root will be minus, so then what is this mean ? can i ignore torsion or the cracking torsion will be zero ?
  5. Ahmad Alhamad

    slab temperature load

    Hello, I have a roof slab and i want to add temperature on it, so when i export it to SAFE, i define two load patern hot and cold but when i assign surface temperature load on it , i found top and bottom temp. on the other hand in ETABS there is one temp. that i include it My question what is...
  6. Ahmad Alhamad

    Design for walking excitation

    Hello, I have to reach the frequancy for large span slab more than 4HZ, but i misunderstand what are the loads that i should include them in time period and mass source definition. should the self weight only be included or self weight plus super imposed dead load and the sustained live load?
  7. Ahmad Alhamad

    Design for walking excitation

    Hello, I have to reach the frequancy for large span slab more than 4HZ, but i misunderstand what are the loads that i should include them in time period and mass source definition. should the self weight only include or self weight plus finishes on slab?
  8. Ahmad Alhamad

    flexural design moment discrepency

    Hello, when i opened the beam flexure envelope and comparing the moment with the moment diagram, i found a discrepency between the two values as pictures below what is the reason for increasing the moment in design?
  9. Ahmad Alhamad

    Property Modifiers

    Hello, I have an issue about Etabs property modifiers when I used the modifiers for all members, how these modifications will reflect on ETABS (what are the results will be changed exactly) if the design will change so when i export the slab to SAFE, the program made cracking analysis for...
  10. Ahmad Alhamad

    how to module 2 slabs with small levels differences

    Hello everybody, I have 2 slabs with 0.5m level differences with beam connect the 2 slab (0.5m depth) what is the best way to module the two slabs I reach to different ways like: 1) drawing the 2 slabs in the same level with beam 0.5m depth. 2) drawing the 2 slabs in the actual levels and...
  11. Ahmad Alhamad

    RMS along-wind acceleration

    Hello, I have a building with height equal 63m, and i want to calculate RMS along-wind acceleration.However, I have issue in calculation modal mass (m1) and the mode exponent (hepsi). Thanks for any help...
  12. Ahmad Alhamad

    Wider beam on supported column

    Hello, I want to ask about the limit allowed for cases when the reinforced beam width is larger than column width. Is it correct to be wider and what is the percent to be wider? On other hand what is the negative reinforcement percent that developed in this case ?
  13. Ahmad Alhamad

    Wider beam on supported columns

    Hello, I want to ask about the limit allowed for cases when the reinforced beam width is larger than column width. Is it correct to be wider and what is the percent to be wider? On other hand what is the negative reinforcement percent that developed in this case ?

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