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SEA Webinar - Case Study of a High Rise Column Bearing Repair

 

July 15, 2020
12:00 PM - 1:00 PM
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Please join the SEA for our virtual meeting on Wednesday, the 15th of July.  This meeting is being coordinated by the Charlotte Chapter, but members of other North Carolina Chapters are invited to attend as well.  This will be an online presentation and the login information will be sent to registered participants on the 14th. 

 

The meeting is free for members or applicants with membership form/dues and $10.00 for nonmembers.  Please make your reservation by 2:00pm on Tuesday, July 14th.  RSVP by clicking the "Register Now" link.  Members will login to the website and register and nonmenbers can register by clicking "Continue as Guest". 

Time: Wednesday, July 15th  12:00 - 1:00 p.m.

Presentation by Wood Environment & Infrastructure Solutions, Inc.: 

The subject structure is a structural steel high-rise with a P/T concrete garage below. During façade renovations, it was discovered that an exterior steel column was missing base plate grout and anchor bolts, bearing only on shim packs. Crushed concrete was noted at the post tensioned beam end below the base plate. This finding made the necessary repair methodology a complicated one beyond ordinary patch repairs.

The repair methodology for the column base and beam involved unloading the subject column by designing shoring and jacking systems, distributing the load to multiple floors. Shoring to ground/foundation was not an option. Subsequently the P/T beam was shored and de-tensioned.  Anchor bolts and missing column reinforcement were installed, the concrete and grout was restored.  The P/T beam was re-tensioned and the structure was returned to service.

The presentation will cover technical challenges in: work in a downtown setting, structural analysis and redistribution of the column load, shoring/load frame design, and de-tensioning and re-coupling of P/T.  The presentation will include video footage of column lift-off and instrumentation used to monitor the lifting/jacking.

Tickets

$0.00 Member Registration

$10.00 Non-Member Registration