Post Analysis Stability & Seismic Checks in UBC 97 | Story drift and torsional irregularity checks
This video shows model stability and analysis results based structure serviceability checks that should be done as UBC-97, before proceeding with design of the structural elements. The already drawn model is a low-rise structure.
After analysis run, stability of model is checked by investigating the Negative Eigenvalue. The video then shows how to make an excel calculation sheet to investigate Story Drift Ratio, Story Drift and Displacement based checks to investigate if the building will behave in serviceable limits during or after earthquake. The last part of video shows how to do torsional irregularity checks in excel by developing the sheet.
00:00 Overview
01:36 Model Stability Check(Eigenvalue)
02:06 Drift Checks(Intro)
04:09 Importing Story Data from ETABS
05:19 UBC Section for Drift Checks
06:27 Story Drift Ratio Check
09:26 Story Drift Check
11:30 Story Displacement Check
15:43 Torsional Irregularity(Intro)
16:40 Torsional Irregularity Checks
Пікірлер: 6
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excellent .
grate
What to do if my model pass in all drift and displacement checks but somehow still gets extreme irregularity and irregularity exists in some lateral load cases?
Do I need to consider torsional irregularity for 2 storey residential. Building due to architectural arrangements of column and beams
@GoldRidgeDesigns
Жыл бұрын
Most of the codes suggest to calculate torsional irregularity, largely for the structures experiencing lateral loads. For instance, Seismic Design Category of your building will suggest to calculate this irregularity or not.