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Estimate Drift in Steel moment Frame

Estimate Drift in Steel moment Frame

Estimate Drift in Steel moment Frame

thread726-449159: Estimate stiffness/drift in a steel moment frame
Hi, I am a fairly new engineer designing a moment frame using the First Order Analysis Method. I am doing it all by hand (no software) and was wondering if there is a way to estimate first order interstory drift (delta-h) for a moment frame whose columns are pinned at the base? I need to solve or estimate this value in order to solve for my B2 multiplier.

I read the thread referenced in this one and it looked like that moment frame was fully fixed at base connections, so I am wondering if any of those equations would work for my situation?

RE: Estimate Drift in Steel moment Frame

The first order displacements and forces can be determined using principles of structural analysis for in-determinate structures.

These solutions have been developed by others and are readily available.
First order elastic formulae - Link or similar are available from different resources.

2nd Order effect can be a bit more cumbersome. But involve determining second order column moments, then adding that moment to the column and computing the deflection of it by some means (euler bernoulli, timoshenko, etc).

RE: Estimate Drift in Steel moment Frame

Thanks so much, I really appreciate it

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