Recent content by Ahmad Alhamad

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...

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 ?

even beam is cracked why cracking torsion should be 0 ? if the beam works compatible, the code allowed to reduce Tu to Tcr so then if Tcr is zero should i design for full Tu even if it works compatible ??

Nu is negative for tension

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...

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 ?

Trenno, from where can i install ETABS v17?

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...

So, should i include the finishes weight on slab or not in vibration calculation ?

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?

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?

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?

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...

try to extrude the beam to shell that taken the inclination then assigne it to slab

this problem is always happened when you change story level, to avoid this problem next times change only one value then make ok to modify this value then open story level second and change other one value then ok and so on this massege appeared when you make more than one change and click ok.