| Ämnesområde: |
| Naturresursutnyttjande och materialåtervinning |
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| Namn: |
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| E-post: |
bjorn.taljsten@ltu.se |
| Univ./Institution: |
Luleå Tekniska Universitet - Samhällsbyggnad |
| Projekttitel (sv): |
Hållbart underhåll av existerande anläggnings-och byggnadskonstruktioner |
| Projekttitel (eng): |
Sustainable Rehabilitation of existing Civil Engineering and Building Structures |
| Värdhögskola: |
Luleå Tekniska Universitet |
| SCB-klassificering: |
Byggnadsteknik, Byggproduktionsteknik, Övrig samhällsbyggnadsteknik och arkitektur |
| Beviljat (SEK): |
Bidragsform |
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2008 |
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ERA-BUILD |
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1196000 |
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| Beskrivning: |
Our existing infrastructure are facing enormous challenges in the near future. Many fo the structures have reached their physical life and need either to be replaced or upgraded. For example the demands on our bridges will encompass higher speeds, higher axle loads, better availability and less traffic disturbance, at the same time using an aging infrastructure. On the top of that, caused by the present economic situation, a reduction of maintenance and replacements budgets is and will be a reality. Traditionally, optimal design of existing structures has consisted in selecting member sizes for structural members to achieve the minimum initial cost that meets all the performance requirements specified in the design code. Recently, the design paradigm has started to shift from an initial cost-effective mode to a life-cycle cost-effective mode. This due to the fact that maintenance, rehabilitation and renewal of existing structures is an ever-growing problem, facing rapid increasing traffic volume on bridges and increased costs both for maintenance of existing and construction of new civil structures. Over the past 15 years, however, research has shown that the initial costs are often dwarfed by the costs of repairing, inspecting and maintaining a structure over its useful life. A life-cycle cost analysis consists of the calculation of not only the initial design and construction costs, but it also includes the costs due to operation, inspection, maintenance, repair, and damage/failure consequences during a specified lifetime. Future costs are typically discounted to the present value for meaningful comparison. The goal is to produce a cost-effective design solution that balances the initial cost and lifetime cost in the preferred manner. In Europe optimal inspection and maintenance strategies for civil structures have recently been analysed by using a supply and demand approach combined with a probability based formulation of the inspection and maintenance activities. Besides the life-cycle cost (LCC), the environmental impact is important in infrastructure management. Since environmental impact assessment of large projects is made mandatory in many countries, various researches attempt to evaluate environmental impacts from infrastructure life-cycle. Civil engineers must pay attention not only to life-cycle cost (LCC), but to life-cycle assessment (LCA) in terms of greenhouse gases emission (CO2). Both of these life-cycle analyses require models, data and to analyse the critical issues when considering practical implementations.
In this project the overarching scientific and technical objective is to develop an innovative decision support system for optimized maintenance of large civil structures such as bridges and dams . The system will be based on appropriate data, methods for Life Cycle Cost Analyses (LCCA), deterioration models and benchmark examples. The decision support system will be sustained by following objectives:
Develop innovative construction methods including new methods to simulate civil structures and their repair by 4D modeling as well as new innovative methods
Develop innovative maintenance methods including a tool-box of available degradation models, and methods for remedial measures including suitable repair and strengthening methods.
Disseminate the results to owners, consultants, and contractors, especially small and medium enterprises, SME. Arrange training courses.
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