The PEs in Construction Group of NYSSPE will host a presentation by Structural Technologies on the topic of Techniques to Reinforce Concrete Structures And Increase Structural Capacity. The presentation will be held on Tuesday, March 13th at 6:00pm at McLaren Engineering in West Nyack, NY. To RSVP and for more info about the presentation, go to: https://www.surveymonkey.com/r/F88B3JR
There are many factors that create the need for strengthening, reinforcing and increasing the load capacity of concrete structures. They include construction and design errors, increase in live load, new code requirements, low concrete strength, voids created during concrete placement, new penetrations and prevention of progressive collapse from blast loads.
Structural strengthening projects may utilize traditional materials such as conventional cement-based and steel materials as well as advanced composite materials (FRP’s) that are commonly used for aerospace applications. The techniques used to design and install these materials for upgrade applications are not common to the engineering and general construction industry which can make strengthening projects even more challenging and complex than new construction.
Factors (among others) affecting the performance or capacity of reinforced concrete
- New Loads – change in use
- Construction or design errors
- Missing, misplaced or damaged reinforcement
- Voids or Honeycombs created during concrete placement
- Cutting of new penetrations that affect existing reinforcement
- Low strength concrete
Strengthening with externally bonded FRP systems
- Typically used forms
- Installation techniques and QA/QC
- Design Concepts per ACI 440 2R-08 and ICC (AC125)
- FRP Limitations and strengthening limits
Conventional strengthening techniques for cases where FRP is not viable
- External and Internal Post Tensioning
- Section enlargement and bonded overlays
- Supplemental steel supports and span shortening
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