ETABS Tutorial 5: Creating a Linear Model with the Same Initial Stiffness as the Nonlinear Model?

[@shareqinamdar8903]

Informative

[@melkamuataro7858]

Hello Engineer Tarek I like your Teaching method. Please keep continuous your video.

[@Eng.tarekyoussef]

Thank you. I will try my best

[@anisrehman9353]

Very informative 👏 Thanks alot sir...❤

[@Eng.tarekyoussef]

Always welcome🙏🏻

[@alyaadella2347]

Hello, I wanna ask is there any stiffness modifier for steel beam? Thank you.

[@Eng.tarekyoussef]

In structural design, the stiffness of steel beams and columns is generally not reduced in the same way as it is for reinforced concrete beams and columns. In reinforced concrete design, the stiffness reduction often refers to considerations such as cracking of concrete and the non-linear behavior of reinforcement under load. Steel members are less affected by load-induced cracking or yielding compared to reinforced concrete. Steel beams and columns are designed to resist bending and axial loads primarily through elastic behavior, where the material remains within its elastic range and returns to its original shape once the load is removed. However, in practical design, factors such as local buckling, lateral-torsional buckling, and stability under various loading conditions are critical considerations that may indirectly affect stiffness calculations. These factors are addressed through appropriate design checks and may influence the effective length and moment of inertia used in the analysis, but they are not typically described as a direct reduction in stiffness similar to what is considered in reinforced concrete design.

[@alyaadella2347]

@@Eng.tarekyoussef thank you for your information👍🏻

[@Abdulhaq_Waseeq]

❤❤❤

[@jackmns]

Why damping ratio is equal to 0 (at 8:10)

[@Eng.tarekyoussef]

The response spectrum in ETABS is already defined with a 5% damping ratio for the Bangkok site of Thailand, providing another 5% damping ratio would essentially apply the damping twice, leading to incorrect results. It's important to ensure that the damping ratio is only assigned once to the spectrum to avoid any inaccuracies in the analysis.