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University of Bath

1. Brindley, Monika. Shear assessment and strengthening of reinforced concrete T-beams with externally bonded CFRP sheets.

Degree: PhD, 2018, University of Bath

Existing reinforced concrete bridges may be deemed inadequate to carry the ever-increasing traffic loads according to the current codes and standards before they reach the end of their design life. It may therefore be required to either strengthen or replace these structures, which can be costly and causes disruptions to the infrastructure. This work investigates experimentally the possibilities to extend the useful life of existing reinforced concrete slab-on-beam structures deficient in shear by means of structural strengthening with fibre-reinforced polymers (FRP). The experimental campaign involved mechanical testing of ten full-scale T-beam specimens, representative of typical existing slab-on-beam bridges. Two sizes of test specimen were used to investigate the effect of size on the ultimate shear capacity of the beams. The investigated shear-strengthening configurations included externally bonded carbon fibre reinforced polymer (CFRP) sheets in a U-wrap configuration with and without end-anchorage and deep embedded CFRP bars. Unstrengthened control specimens were also tested to provide baseline for comparison. The results from the experimental programme revealed that while the deep embedment strengthening solution provides an increase in shear capacity of up to 50%, the strengthening with CFRP U-wraps results in reduced capacity compared with the underlying control beam. This presents a major implication in terms of safe design predictions of shear capacity of reinforced concrete T-beams strengthened with CFRP sheets as this is the most commonly used shear-strengthening scheme in practice. The study also demonstrated that greater contribution from the externally bonded CFRP U-wraps can be achieved using end-anchorage systems, which delay the debonding of the CFRP. The applicability of current codes of standards and guidelines was studied as well as appropriateness of using advanced numerical methods for assessment of existing reinforced concrete structures. It was found that while the standards used for assessment greatly under-predict the shear capacity, the guidelines for FRP-strengthened beams either under- or over-predict the shear capacity of the tested beams. More accurate predictions are possible using advanced fracture mechanics-based methods for both the unstrengthened as well as the strengthened beams.

Subjects/Keywords: 624.1; Reinforced Concrete T-beams; Shear; FRP Strengthening; Assessment; CFRP sheets; Deep Embedment; Experimental Testing; Numerical Analysis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Brindley, M. (2018). Shear assessment and strengthening of reinforced concrete T-beams with externally bonded CFRP sheets. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/shear-assessment-and-strengthening-of-reinforced-concrete-tbeams-with-externally-bonded-cfrp-sheets(5467c456-6b66-4e60-911d-0007887ce790).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761006

Chicago Manual of Style (16th Edition):

Brindley, Monika. “Shear assessment and strengthening of reinforced concrete T-beams with externally bonded CFRP sheets.” 2018. Doctoral Dissertation, University of Bath. Accessed February 25, 2021. https://researchportal.bath.ac.uk/en/studentthesis/shear-assessment-and-strengthening-of-reinforced-concrete-tbeams-with-externally-bonded-cfrp-sheets(5467c456-6b66-4e60-911d-0007887ce790).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761006.

MLA Handbook (7th Edition):

Brindley, Monika. “Shear assessment and strengthening of reinforced concrete T-beams with externally bonded CFRP sheets.” 2018. Web. 25 Feb 2021.

Vancouver:

Brindley M. Shear assessment and strengthening of reinforced concrete T-beams with externally bonded CFRP sheets. [Internet] [Doctoral dissertation]. University of Bath; 2018. [cited 2021 Feb 25]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/shear-assessment-and-strengthening-of-reinforced-concrete-tbeams-with-externally-bonded-cfrp-sheets(5467c456-6b66-4e60-911d-0007887ce790).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761006.

Council of Science Editors:

Brindley M. Shear assessment and strengthening of reinforced concrete T-beams with externally bonded CFRP sheets. [Doctoral Dissertation]. University of Bath; 2018. Available from: https://researchportal.bath.ac.uk/en/studentthesis/shear-assessment-and-strengthening-of-reinforced-concrete-tbeams-with-externally-bonded-cfrp-sheets(5467c456-6b66-4e60-911d-0007887ce790).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761006


University of Georgia

2. Jackson, Chester W. Spatio-temporal analysis of barrier island shoreline change.

Degree: 2014, University of Georgia

Deficiencies exist in the study of shoreline dynamics of Georgia’s barrier islands and the processes that influence change. Previously unexamined shoreline localities that were difficult to assess using existing techniques and software programs provide a basis for the development of new tools and methods for analyzing change. AMBUR (Analyzing Moving Boundaries Using R) was developed to analyze shoreline change along barrier islands with complex shapes and highly curved coastlines. Built using the R programming environment, AMBUR provides a suite of functions for quantifying the rate and magnitude of shoreline movement and performs additional statistical, graphical, and geospatial analyses. The reliability of transect-based analyses is improved using new techniques for curved shorelines too problematic for the traditional perpendicular-transect method. Application of AMBUR to Georgia’s barrier islands provides a robust dataset for island-wide shoreline change and assists with classifying the modern behavior of the coast. Historical shorelines from 1855 to 2004 were analyzed and partitioned into oceanfront, backbarrier, and inlet-facing zones. Throughout the 1855 to 2004 era, 41 % of Georgia’s oceanfront shoreline eroded at a mean rate of -1.66 m/yr EPR (± 0.06 m/yr) and the remaining shoreline accreted at 2.25 m/yr EPR (± 0.06 m/yr). The backbarrier eroded along 65 % of the shore at a mean rate of -0.35 m/yr EPR (± 0.07 m/yr) throughout the period. More than half of the islands exhibit a net seaward shift in area and regressive behavior, whereas Wolf and St. Catherines Islands are thinning and shortening and are transgressive, erosional hotspots. Reversals of longshore transport currents, primarily due to inlet dynamics and seasonal shifts in climate regimes, promote periods of accretion and erosion along the northern and southern ends of some islands. Stable, migrating, and ephemeral inlet processes at the local level exert the greatest influence over oceanfront shorelines. Backbarrier shorelines are primarily influenced by tidal creek migration, proximity to inlets and confluences of other streams. Human activities are influencing shoreline erosion and accretion rates through uses of hard/soft stabilization and dredging activities.

Subjects/Keywords: shoreline change; oceanfront; backbarrier; inlet; coastal mapping; Holocene; Pleistocene; AMBUR; transect; baseline; erosion; accretion; t-sheets; aerial photography; endpoint rate; morphodynamics; anthropogenic; hard stabilization; storms; rivers; tidal

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jackson, C. W. (2014). Spatio-temporal analysis of barrier island shoreline change. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/26360

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Jackson, Chester W. “Spatio-temporal analysis of barrier island shoreline change.” 2014. Thesis, University of Georgia. Accessed February 25, 2021. http://hdl.handle.net/10724/26360.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Jackson, Chester W. “Spatio-temporal analysis of barrier island shoreline change.” 2014. Web. 25 Feb 2021.

Vancouver:

Jackson CW. Spatio-temporal analysis of barrier island shoreline change. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Feb 25]. Available from: http://hdl.handle.net/10724/26360.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jackson CW. Spatio-temporal analysis of barrier island shoreline change. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/26360

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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