Story Drift Vs Max. Deflection
Posted 28 September 2010 - 01:29 PM
1. Story Drift...Is the intent to measure the "average" displacement of the structure under the design EQ?
2. Compared to the Maximum design EQ deflection of members.
The structure I am looking at is an existing industrial structure somewhat similiar to a building. The "Average" roof displacement is around 0.5 inches measure near the center of the structure. (flexible roofs)....
While some of the boundary elements deflect around 1.3 inches.....
any thoughts on the proper use? This is a very light, tall and flexible structure. (ie cheaply built)
Posted 28 September 2010 - 05:16 PM
Posted 29 September 2010 - 12:21 AM
Posted 29 September 2010 - 01:20 AM
Posted 30 September 2010 - 12:38 AM
Posted 30 September 2010 - 03:08 AM
Posted 30 September 2010 - 01:35 PM
Per ASCE 7-05
Story Drift section 12.8.6.....simply the difference between the moments of the center of mass between floors. Nothing to do with individual columns. (This problem some of the boundary columns move larger amounts, which ends up being a P-delta issue)
12.12.2 Diaphragm Deflection: basically what ever is permissable and still maintains structural intregrity.
Total building deflection and building seperation is a different issue covered under 12.12.3
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