really appreciate !

Thanks

@Eng.tarekyoussef

Ай бұрын

Welcome

In the CSI stiffness modifier page you showed says you should use the same stiffness modifier if you want to model the out of plane stiffness of the wall. So you should use 0.7 instead of 0.25.

@Eng.tarekyoussef

Ай бұрын

m11, m22 and m12 are the modifiers for the out-of-plane stiffness!

@abelberhanemeskel1426

Ай бұрын

Yes they are but I'm saying you should use 0.7 for out of plane stiffness instead of 0.25.

@Eng.tarekyoussef

Ай бұрын

There is no need to use 0.7. I believe you may have misunderstood the website. In my research, I used 0.25, which means I reduced the wall stiffness by 75%, reflecting the reality that shear walls are weak in resisting out-of-plane bending. This approach is commonly adopted by engineers. If you prefer to use 0.7, that is your choice, but using 0.25 is also valid. Many engineers even use values as low as 0.1 to represent the minimal out-of-plane stiffness of walls. Additionally, the ACI code specifies reducing the out-of-plane stiffness of slabs to 0.25 but does not mention walls. This suggests that using 0.25 for walls is reasonable since they behave similarly to slabs under out-of-plane loads.

@abelberhanemeskel1426

Ай бұрын

Please refer the CSIamerica page you have shown in the video and refer to the note. wiki.csiamerica.com/display/etabs/Modeling+concrete+cracked+section+properties+for+building+analysis

Do you use stiffness modifier for design also?

@Eng.tarekyoussef

10 ай бұрын

Sure

Is it for ultimate limit state?

@Eng.tarekyoussef

2 жыл бұрын

Yes for ultimate limit state

@kinjazz5050

2 жыл бұрын

Thank you

Can I output the result of compressive stress and tensile stress in slab by using ETabs ? How do I read

@Eng.tarekyoussef

Жыл бұрын

Certainly, ETABS can provide you with the tensile stresses of a slab. To obtain these stresses, you would need to select the shell stresses results, specifically S11, S22, and so on. It's important to understand the nature of the applied loads, whether they are gravity loads or lateral loads. This understanding helps determine which results you are interested in. For example, let's assume that a lateral load is applied to the floor in the Y-direction. In order to obtain the compressive and tensile stresses resulting from this load, you would need to check the F11 or S11 values in the shell stresses results. These values correspond to the stresses along the X-axis, which in this case represents the direction perpendicular to the applied load.