When you are good at something, you can present it well.

@Eng.tarekyoussef

3 ай бұрын

Hope you enjoy it

hello, how to define in Etabs that the bracing of my building is provided by concrete frames when we don't have reinforced concrete bracing wall? should i release moments at the start and end of columns or at the start and end of the beams ? the bracing is provided by free-standing reinforced concrete portal frames

@Eng.tarekyoussef

Ай бұрын

To accurately model the behavior of the portal frames as bracing elements, you typically release moments at the ends of beams where they connect to columns. This approach acknowledges that the beams are hinged (or nearly hinged) at their ends where they meet the columns (not at the start and end of the columns). The decision to release moments depends on the structural design and the intended behavior of the portal frame system under lateral loads. If the frame is designed assuming hinge behavior at the beam-column connections (for example, for moment redistribution under lateral loads), you release moments. If the design assumes rigid connections to transfer moments and shear without significant rotation, you do not release moments. In summary, you do not necessarily release moments to all beams in all types of portal frame systems. It depends on the type of the beam-column connection (fixed or hinged connection).

hello sir, is equivalent static method and equivalent lateral force analysis are the same? if not, what's the difference?

@Eng.tarekyoussef

4 ай бұрын

Yes same

good afternoon sir tarek, I'm geri engineer from indonesia, I'd like to ask, in the asce code there is a chapter that states live load (0.25) should be included when calculating seismic mass, this can be done manually for simple building geometry, but when the building geometry becomes irregular, it can be cumbersome. my question is how would you obtain story masses including live load to calculate seismic masses, can we use etabs to obtain this mass (including live load seismic mass ) using etabs?, thank you, appreciate your response

@Eng.tarekyoussef

11 ай бұрын

Hello! Yes, you can use ETABS to obtain story masses, and you can include the live load in the computation of the seismic masses. To accomplish this, you simply need to add the live load pattern which you've assigned to each floor within the Mass Source definition. Including a portion of the Live Load in computing the seismic mass is typically applied in scenarios like storage areas or malls, as well as in structures where there is a substantial presence of people and heavy equipment. Check the first 40 sec of this video regarding the Mass Source definition, I have included all the "Dead" loads and "SIDL". To include a portion of the live load you need to add the live load pattern and to put the multiplier to 0.25. kzread.info/dash/bejne/jJmZx7iMpqzaY9Y.htmlsi=adnJr3J-7EhkuY_x

would you like sharing the excel file?

@Eng.tarekyoussef

7 ай бұрын

You can access and download the Excel sheets by clicking on the link below: drive.google.com/drive/folders/1WWyrqs8OaJbvIjkEqigb8ki_FDQmfauO?usp=sharing

I have many question first how do I choose the fundamental period For the X direction and Y direction do i choose the period that give us the biggest participation ratio? and is it always in the first two mode? And why do i have to the time. And why do i have to take the time period in two direction in to consideration ? and what is the most critical The bigger T or the smaller T to the structure I mean, if we have like time period equal to 1.7 second and we have another time period Equal 0.5 second which of them is more dangerous or more critical to the structure ? also, I have another question how do I know exactly how much load has been transferred from the slab to the beam the exact dead load and live load if I have a like a ripped slab modeld as shell slab because I want to take this beam and all the line load that has been transferred to it to another program to design it Thank you tarek

@Eng.tarekyoussef

5 ай бұрын

Choosing the fundamental period for the X and Y directions typically involves analyzing the structural response in each direction separately. One common approach is to select the fundamental period that yields the highest participation ratio, indicating the mode of vibration that contributes the most to the overall response of the structure. These modes are often among the first two modes, as they typically dominate the structural behavior. Considering the time period in both directions is crucial because structures can respond differently to seismic excitations along different axes. Accounting for both X and Y directions ensures a comprehensive assessment of the structure's dynamic characteristics and its ability to withstand seismic forces from all orientations. Regarding the criticality of the time period, structures can exhibit different responses depending on the period. In general, smaller periods correspond to higher frequencies and stiffer structures, which might be less susceptible to certain types of loading. Conversely, larger periods indicate lower frequencies and more flexible structures, which could be more susceptible to certain loading conditions, such as resonance effects. However, the specific criticality depends on the structural design, material properties, and loading conditions, among other factors. Regarding your second question about determining the load transferred from the slab to the beam in a model, especially if it's a shell slab, you typically need to perform structural analysis using finite element methods. My suggestion for you is to use the main beams of your ribbed slab and assigned over them a shell element which is equivalent in mass to the ribbed slab. In this way we can approximate the force transfer. I hope this helps clarify your questions.

@LodyBasha

5 ай бұрын

@@Eng.tarekyoussef thank you engineer Tarek for your reply and your time thank you very much

Thanks. Provide the Excel sheet.

@Eng.tarekyoussef

7 ай бұрын

You can access and download the Excel sheets by clicking on the link below: drive.google.com/drive/folders/1WWyrqs8OaJbvIjkEqigb8ki_FDQmfauO?usp=sharing

@shahriyarkhan3521

5 ай бұрын

@@Eng.tarekyoussef