Estimate Drift in Steel moment Frame

[Erik_Struct]

thread726-449159
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?

 

[driftLimiter]

Erik,
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).

 

[Erik_Struct]

Thanks so much, I really appreciate it