CFRP strengthening of a railway concrete trough bridge – a case study

Bennitz, Anders; Täljsten, Björn; Danielsson, Georg

doi:10.1080/15732479.2010.489787

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…The NSM technique was, to the authors' knowledge, first applied in the mid 90-ties for strengthening of a RC cable stayed bridge in Uddevalla, Sweden. Considerable research on NSM strengthening solutions [8][9][10][11][12][13][14][15][16][17][18][19] has since been carried out. Compared to EBR, the NSM technique provides increased interfacial stress capacity [8][9][10], due to a larger bond surface and confinement provided by the surrounding concrete [9,19].…”

Section: Introductionmentioning

confidence: 99%

Strengthening of RC beams using bottom and side NSM reinforcement

Sabău

Popescu

Schmidt³

et al. 2018

Composites Part B: Engineering

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The allowable strain in fibre reinforced polymers reinforcement is limited by design codes to avoid debonding. The near-surface mounted (NSM) reinforcement technique has been proven to produce better anchorage behaviour compared to externally bonded reinforcement solutions. However, NSM solutions do not always eliminate debonding issues, with concrete cover detachment (CCD) typically occurring in RC beams strengthened for flexure. This experimental study investigated the efficiency of side mounted (S) compared to bottom mounted (B) NSM bars to prevent CCD. The experimental results were compared to models available in the literature that predict the observed failure modes and the crack spacing in the NSM anchorage zone. Compared to B-NSM, the S-NSM solution was successful in avoiding brittle CCD failure and showed increased rotational capacity and energy dissipation at failure. Existing CCD debonding models were found to be conservative.

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Section: Introductionmentioning

confidence: 99%

Strengthening of RC beams using bottom and side NSM reinforcement

Sabău

Popescu

Schmidt³

et al. 2018

Composites Part B: Engineering

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“…Wallin et al (2011) investigated two different strengthening methods (adding arches or prestressing the floor beams) for a through-girder steel railway bridge in the city of Stockholm, Sweden. Bennitz et al (2012) presented an upgrading and monitoring of a Swedish concrete railway bridge. In this method, carbon fiber tubes are inserted in holes drilled in the transverse direction of the slab.…”

Section: Introductionmentioning

confidence: 99%

Renovation of existing steel railway bridges: Field test and numerical simulation

Lin

Taniguchi

Yoda

et al. 2017

Advances in Structural Engineering

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Renovation of the aged steel railway structures is of vital importance due to their long service life after completion. A strengthening method for aged steel railway bridges by using rubber-latex mortar, glass fiber-reinforced polymer plates, lightweight rapid hardening concrete, and reinforcing bars was introduced in this article. To confirm the real effect of the present strengthening method, field tests were performed on two aged steel railway bridges that have been in service for 87 and 61 years, respectively. Stress variations on the mid-span section of the railway bridge due to the running trains were measured in the field test, and the stress reduction effects as well as the load redistribution effects of the present strengthening method were also confirmed. Three-dimensional finite-element models were built, and the numerical results were in good agreement with the field test results. Besides, structural vibration and noise levels of both strengthened and un-strengthened railway bridges were measured, and the noise reduction effect of the present method was confirmed in the field tests. In addition, further nonlinear analyses were performed, and the applied load-displacement relationships as well as the load-normal longitudinal strain curves of the aged structural steel, the glass fiber-reinforced polymer plates and the rapid hardening concrete, were given. Both experimental and numerical results indicate that the present renovation method can greatly enhance the stiffness and reduce the stress levels of steel members, resulting in the extension of the residual service life of the aged steel railway bridges.

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