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Taqiuddin Syed Shah Thesis.pdf (2.17 MB)

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An Alternative Strengthening Technique using a Combination of FRP Sheets and Rods to Improve Flexural Performance of Continuous RC Slabs

Syed Shah, Taqiuddin Q
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1469151846

Abstract Details

2016, Master of Science, University of Toledo, Civil Engineering.
The present research in this study is directed towards improving the flexural performance, namely the load and displacement ductility capacities, and exploring the various failure modes, of continuous reinforced concrete (RC) slab strips. This improvement is accomplished by applying fiber reinforced polymers (FRP) of two types: FRP sheets and FRP rods, in both positive and negative regions of moment of the continuous RC slab strip. Currently, experimental research has shown that applying FRP rods using the near surface mounted (NSM) method to strengthen continuous RC structures can greatly improve flexural capacity and moment redistribution. Despite the benefits of FRP rods through the NSM method, applying FRP sheets using the externally bonded reinforcement (EBR) method is more common due to its ease of application and cost. Thus, this study takes into account the benefits of both NSM & EBR strengthening techniques, and presents an alternative strengthening combination using EBR-FRP sheets to strengthen the positive moment or sagging region, and NSM-FRP rods to strengthen the negative moment or hogging region of continuous RC slabs strips. Currently, the challenges faced when using FRP strengthening depends on the type of FRP material used. The EBR-FRP sheets suffer from debonding (loss of stress transfer between concrete-FRP) failures when facing high moments. To prevent these, anchorages can be provided. These anchorages are however, expensive and their applicability is limited. NSM-FRP rods suffer from sudden FRP rupture but are generally safer to use than FRP sheets. However, they require cutting of grooves on the concrete surface limiting their applicability in certain regions as well. The presented alternative strengthening combination aims at overcoming these drawbacks by applying EBR-FRP sheets in most locations while reducing the need for anchorages, and using NSM-FRP strengthening only in locations that benefit from concrete cover. Through, complex finite element analysis (FEA), the effectiveness of this combined strengthening method is investigated. Parametric studies to study the influences of carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP), various FRP reinforcement ratios (¿_frp^ ), and width of EBR sheet, on the flexural load and displacement ductility capacities, concrete-FRP bond strength, and failure modes, are also discussed. The general conclusion from this study indicates that the combination of using both EBR and NSM techniques simultaneously is more effective than using either EBR or NSM independently. CFRP material provided better load capacity and displacement ductility than GFRP; however GFRP led to more predictable failure modes. Overall, the sagging region FRP showed higher influence in increasing the load capacity and ductility. The hogging region FRP showed higher influence on the type and location of failure mode. Additionally, the hogging region FRP had a detrimental effect on the ductility when increased. The width of FRP sheets had a low impact on the bond strength or failure modes when lower ¿_frp^ values were used. However, using higher ¿_frp^ values required wider FRP sheets to prevent FRP debonding failures. Using wider FRP sheets also resulted in slightly higher displacement ductility.
Azadeh Parvin (Committee Chair)
Mark Pickett (Committee Member)
Eddie Chou (Committee Member)
103 p.
Civil Engineering; Engineering; Polymers
Near surface mounted, NSM, fiber reinforced polymers, FRP, externally bonded reinforcement, EBR, reinforced concrete, RC, continuously supported, applied loading, finite element analysis, FEA, debonding, failure mode, ANSYS

Recommended Citations

Citations

  • Syed Shah, T. Q. (2016). An Alternative Strengthening Technique using a Combination of FRP Sheets and Rods to Improve Flexural Performance of Continuous RC Slabs [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1469151846

    APA Style (7th edition)

  • Syed Shah, Taqiuddin. An Alternative Strengthening Technique using a Combination of FRP Sheets and Rods to Improve Flexural Performance of Continuous RC Slabs. 2016. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1469151846.

    MLA Style (8th edition)

  • Syed Shah, Taqiuddin. "An Alternative Strengthening Technique using a Combination of FRP Sheets and Rods to Improve Flexural Performance of Continuous RC Slabs." Master's thesis, University of Toledo, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1469151846

    Chicago Manual of Style (17th edition)

toledo1469151846
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This open access ETD is published by University of Toledo and OhioLINK.