| 1. |
- Cahill, Paul, et al.
(author)
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Energy Harvesting from Train-Induced Response in Bridges
- 2014
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In: Journal of Bridge Engineering. - 1084-0702 .- 1943-5592. ; 19:9, s. 04014034-
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Journal article (peer-reviewed)abstract
- The integration of large infrastructure with energy-harvesting systems is a growing field with potentially new and important applications. The possibility of energy harvesting from ambient vibration of bridges is a new field in this regard. This paper investigates the feasibility of energy harvesting for a number of trains considering their passage over a bridge. The power that can be derived from an energy-harvesting device due to a train crossing a bridge at different speeds is compared against typical demands of small wireless devices and is found to be adequate for powering such devices. These estimates of harvested energy also relate to the individual signatures of trains. In this work, the modeled dynamic responses of a bridge traversed by trains are compared against full-scale experimental analysis of train-bridge interactions. A potential application in structural health monitoring (SHM) using energy harvesting has also been demonstrated and compared with laboratory experimental data. Consistent and monotonic damage calibration curves have been constructed using estimated harvested energy.
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| 2. |
- Horgan, Chris, et al.
(author)
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Using Energy Payback Time to Optimise Onshore and Offshore Wind Turbine Foundations
- 2012
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In: Proceedings of the 9<sup>th</sup> ASMO-UK / ISSMO Conference on Engineering Design Optimization. ; , s. 48-60
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Conference paper (other academic/artistic)abstract
- Ireland has a target of meeting 40% of its electricity requirement with renewable energy by 2020[1]. It is estimated that Ireland has a practical wind energy resource of 613TWh, which is about 21 times the total electricity requirement in Ireland at the end of 2008. Therefore wind energy is worth pursuing, however many technical challenges remain as it progresses offshore, one of which is the foundation and this will be designed and optimised in this paper.Four different wind turbine foundations (WTF) will be designed and optimised in this paper, which include the small scale onshore, large scale onshore, offshore monopile and offshore gravity-based foundation. The foundation makes up on average 6.5% of the capital cost for onshore projects and 34%of that of offshore projects[2]. This justifies the need for optimisations to be performed on all WTFs to make wind energy more cost-competitive with conventional forms of thermal electricity generation.The primary driver in foundation size is wind loading, however it is also more desirable locate these structures in high wind resources to maximise the annual energy yield and consequently return on investment. Therefore a specific indicator has been developed for this project to measure performance of each foundation in terms of its mass compared to the annual energy yield of the wind turbine. This indicator is the energy payback time and it is minimised in order to develop the optimal foundation.The trade-off between material mass and annual energy yield is applied to define the performance of all designs developed for wind turbine foundations in this project. This is done to identify which foundation is most environmentally-friendly and cost-effective solution in delivering in Ireland’s renewable electricity target of 40% by 2020.
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| 3. |
- Johansson, Christoffer, et al.
(author)
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A methodology for the preliminary assessment of existing railway bridges for high-speed traffic
- 2014
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In: Engineering structures. - : Elsevier BV. - 0141-0296 .- 1873-7323. ; 58, s. 25-35
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Journal article (peer-reviewed)abstract
- The Swedish government is considering upgrading the train speed along three railway lines in the Southern part of Sweden from 200 km/h to 250 km/h. According to the current design code, this requires that the bridges be examined with dynamic simulations to avoid excessive vibrations. This paper employs a method that can be used at an early stage to estimate the expected cost of upgrading a bridge network. The results revealed that 70% of the plate/beam bridges, 64% of the closed slab-frame bridges, and 41% of the open slab-frame bridges are expected to not fulfill the requirement on the maximum bridge deck acceleration for ballasted tracks.
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| 4. |
- Johansson, Christoffer, et al.
(author)
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Probabilistic Dynamic Analysis of Existing Railway Bridges for High-Speed Traffic
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Other publication (other academic/artistic)abstract
- The Swedish government is considering upgrading the train speed along three railway lines in the Southern part of Sweden from 200 km/h to 250 km/h. According to the current design code, this requires that the bridges be examined with dynamic simulations to avoid excessive vibrations. This paper employs a method that can be used at an early stage to estimate the expected cost of upgrading a bridge network. The results revealed that 70% of the plate/beam bridges, 64% of the closed slab-frame bridges, and 41% of the open slab-frame bridges are expected to not fulfil the requirement on the maximum bridge deck acceleration for ballasted tracks.
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| 5. |
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| 6. |
- Ni Nuallain, Nora Aine, et al.
(author)
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Optimal seismic retrofit strategy selection of deteriorating concrete structures
- 2012
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In: Bridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management. - : Taylor & Francis Group. - 9780415621243 ; , s. 3568-3575
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Conference paper (peer-reviewed)abstract
- This paper presents a robust/repeatable approach for identification of the optimal retrofit strategy for structures in seismic zones which is probabilistically based and ultimately objective. The approach addresses the issues of (i) computational complexity vs. efficiency in modeling structures in seismic zones, (ii) the formulation of the structures seismic vulnerability probabilistically through the use of fragility curves and (iii) the incorporation of varying seismic retrofit options into these fragility curves to identify the optimal rehabilitation strategy for a structure as a function of condition. The overall aim and result is the optimization of retrofit budgets.
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