November 21, 2019 Meeting
Please join us for our November Meeting. This will be a Thanksgiving Luncheon meeting at Dilworth Neighborhood Grille on Thursday, November 21, 2019 with registration/socialization beginning at 11:30 am.
The details for the meeting are as follows:
Topic: Structural Concrete Repair – A Team Effort
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 were 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.
Presenters: George L. Luckenbaugh P.E., Principal Engineer with Wood Environmental & Infrastructure Solutions Inc.
PDH: 1 Hour
Date: Thursday, November 21, 2019
Time: 11:30 a.m. – 1:00 p.m.
Location: Dilworth Neighborhood Grille (basement level, Baxter Room)
MAP 911 E. Morehead Street, Charlotte, NC 28204
Cost: $25 for Members; $30 for Non-Members
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