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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

URL: 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 

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

2. Raicic, Vesna. Deep embedment shear strenghtening of reinforced concrete continuous T-beams.

Degree: PhD, 2019, University of Bath

URL: https://researchportal.bath.ac.uk/en/studentthesis/deep-embedment-shear-strenghtening-of-reinforced-concrete-continuous-tbeams(052f8d25-e56a-4034-84e1-3c8c94058922).html  ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787515 

The need to extend the lifetime of our structures is crucial due to social, environmental and economic significance. Substantial number of existing buildings, need to be adapted to meet the requirements of the 21st century. There is no doubt that existing RC beams, which have shear deficiencies, will need strengthening. These deficiencies may occur due to insufficient shear reinforcement, reduction in steel area due to corrosion, increased service load or construction defects. Despite numerous studies, shear behaviour before or after strengthening is still not fully understood, particularly in continuous concrete structures which are the norm. This experimental work investigates strengthening of the existing reinforced concrete continues structures, deficient in shear by using the Deep Embedment (DE) technique. The experimental campaign involved mechanical testing of ten push-off specimens and ten two-span continuous T-beams in order to analyse and discuss the aspects related to the effectiveness of the DE technique and the types of failures of the system. An important connection was established between the push-off testing and the continuous T-beam results. Average recorded peak strains in the Deep Embedment bars in the continuous beams compare pretty well with equivalent peak strains recorded in the push-off specimens. This important finding suggests that push-off tests are indeed representative of results from the real beam tests when it comes to determining the levels of strain mobilised in the DE FRP bars. Different variables such as the type of DE bar material (steel, CFRP or GFRP), inclination of DE bars (900 or 450) and spacing between DE bars were studied. The results obtained have demonstrated that this technique is able to increase significantly the load carrying capacity of RC continuous beams which were originally deficient in shear. A significant increase in shear capacity was obtained in all the adopted strengthening configurations. The ultimate shear capacity increased on average by more than 60% across all the beams, demonstrating that the DE technique is indeed an effective solution for the strengthening of continuous RC T-beams deficient in shear, whether vertical or inclined bars were adopted and regardless of the type of DE bar material used. A powerful analytical approach, based on the upper- bound theory of plasticity, was developed and applied to unstrengthened specimens to produce realistic assessments of shear capacity. The upper-bound model was then extended to specimens strengthened using the deep embedment technique, producing accurate predictions for all specimens strengthened with steel, CFRP or GFRP bars. It was shown that the proposed upper-bound method is able to offer good shear predictions.

Subjects/Keywords: Deep Embedment; Continuous T-beams; Shear Strengthening; RC beams

…deficient in shear by using the Deep Embedment (DE) technique. The experimental campaign… …strengthened using the deep embedment technique, producing accurate predictions for all specimens… …Deep Embedment (DE) technique, an alternative strategy for shear strengthening of… …to investigate the effectiveness of the Deep Embedment technique has taken place on simply… …strengthened in shear using the Deep Embedment technique. For this purposes an experimental program… 

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

APA (6th Edition):

Raicic, V. (2019). Deep embedment shear strenghtening of reinforced concrete continuous T-beams. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/deep-embedment-shear-strenghtening-of-reinforced-concrete-continuous-tbeams(052f8d25-e56a-4034-84e1-3c8c94058922).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787515

Chicago Manual of Style (16th Edition):

Raicic, Vesna. “Deep embedment shear strenghtening of reinforced concrete continuous T-beams.” 2019. Doctoral Dissertation, University of Bath. Accessed February 25, 2021. https://researchportal.bath.ac.uk/en/studentthesis/deep-embedment-shear-strenghtening-of-reinforced-concrete-continuous-tbeams(052f8d25-e56a-4034-84e1-3c8c94058922).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787515.

MLA Handbook (7th Edition):

Raicic, Vesna. “Deep embedment shear strenghtening of reinforced concrete continuous T-beams.” 2019. Web. 25 Feb 2021.

Vancouver:

Raicic V. Deep embedment shear strenghtening of reinforced concrete continuous T-beams. [Internet] [Doctoral dissertation]. University of Bath; 2019. [cited 2021 Feb 25]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/deep-embedment-shear-strenghtening-of-reinforced-concrete-continuous-tbeams(052f8d25-e56a-4034-84e1-3c8c94058922).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787515.

Council of Science Editors:

Raicic V. Deep embedment shear strenghtening of reinforced concrete continuous T-beams. [Doctoral Dissertation]. University of Bath; 2019. Available from: https://researchportal.bath.ac.uk/en/studentthesis/deep-embedment-shear-strenghtening-of-reinforced-concrete-continuous-tbeams(052f8d25-e56a-4034-84e1-3c8c94058922).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787515

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