CSI ETABS - 09 - Story Drift check as per ASCE-7 16 | Part 3

In this lecture, Story Displacement, Story Drift and Story Drift Ratio Check as per ASCE Part 3 is discussed.

1- Story Displacement, Story Drift and Story excel sheet
Download: https://civilmdc.com/2020/03/09/story...

2- Uniform Building Code (UBC 97), Volumne I, II and III
Download: https://civilmdc.com/2020/03/09/unifo...


a) STORY DISPLACEMENT is the lateral displacement of floor or point from its original position.
b) STORY DRIFT is the lateral displacement of one level relative to the level below.
c) STORY DRIFT RATIO is the story drift divided by the story height.

Code requirements
The Maximum Inelastic
Response Displacement, Delta m, shall be computed as follows:
delta m = 0.7 R* delta S

EXCEPTION: Alternatively, delta m may be computed by nonlinear
time history analysis in accordance with Section 1631.6.

1630.10.1 General. Story drifts shall be computed using the
Maximum Inelastic Response Displacement, delta m.

Calculated story drift using delta m, shall not
exceed 0.025 times the story height for structures having a fundamental period of less than 0.7 second. For structures having a fundamental period of 0.7 second or greater, the calculated story drift shall not exceed 0.020 times the story height.

As per UBC -97 Code
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