| 1. |
- Achi, L. M., et al.
(författare)
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Wanted : A larger, different kind of box
- 2016
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Ingår i: IABSE Congress Stockholm, 2016. - : International Association for Bridge and Structural Engineering (IABSE). - 9783857481444 ; , s. 358-367
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Konferensbidrag (refereegranskat)abstract
- To have the ability to "think outside the box" is generally regarded as something positive. At a moment in time when resources are scarce, and the problems facing us are many, innovation and professional excellence becomes a requirement, rather than a matter of choice. At the core of our attempts to come up with new, and better solutions are the digital technologies. Within the structural engineering context, the different types of off-the-shelf packages for finite element analysis play a central role. These "black-box" types of software packages exemplify how user friendliness may have harmful consequences within a field where knowledge and the successful mastery of relevant skills is key, and consequently- ignorance may lead to fatal results. These tools make any effort "venturing outside" difficult to achieve. A technical paradigm shift is called for that places learning and creative, informed exploration at the heart of the user experience.
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| 2. |
- Andrade, Pedro, et al.
(författare)
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Innovative system for the construction and management of student resisdences : Frameup system
- 2016
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Ingår i: IABSE CONGRESS, STOCKHOLM, 2016. - CH - 8093 Zürich, Switzerland : International Association for Bridge and Structural Engineering. - 9783857481444 ; , s. 1364-1370
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Konferensbidrag (refereegranskat)abstract
- Sweden has a strong demand on the construction of student accommodations and consequently significant efforts have been taken to increase and streamline construction methods. In addition, the fluctuation on the number of students admitted at each year, in each university, lead to periods of house shortage or, in opposition to that, to eventual surplus on the housing market. For these reasons urges finding a fast execution process in construction to fulfil the market needs, together with a housing mechanism of control which balances the students’ needs with the housing availability. In this sense, the Frameup system arises as a solution to solve both problems by combining a modular construction with an innovative execution process.The FRAMEUP buildings uses a steel frame in combination with prefabricated 3D modules - fully equipped and suitable for student accommodations – which are assembled by starting from the roof to the 1st floor. The existence of the lifting system permits the erection of the building, promoting each time the building is lifted, a clearance of one-floor-height, at ground level, for the assembly of a new floor. The procedure is repeated several times, according to the number of floors, until the 1st floor of the building, the last floor of the execution sequence, is assembled.Alongside with its advantage on the fast execution, the Frameup system allows to efficiently increase or decrease the number of the floors and consequently its exchangeability with other buildings of same nature. Thus, assuming a net of FRAMEUP buildings at each university, its exchangeability system would create the necessary conditions so that the number of floors at each campus would follow the fluctuations of the students’ population among the different universities on different periods of time, so to suppress the needs for housing or to avoid the surplus on construction.
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| 3. |
- Bagge, Niklas, 1987-, et al.
(författare)
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Evaluation of residual prestress force in a concrete girder bridge
- 2016
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Ingår i: IABSE CONGRESS, STOCKHOLM, 2016. - CH - 8093 Zürich, Switzerland. - 9783857481444 ; , s. 222-229
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Konferensbidrag (refereegranskat)abstract
- When assessing the structural behaviour of prestressed concrete bridges, understanding the level of prestressing is crucial. However, for existing structures, this is usually an unknown parameter and the literature only describes a few methods of experimentally determining the residual prestress forces. For this paper, a non-destructive testing approach has been evaluated based on testing of a multi-span continuous girder bridge. The method, consisting of in-situ measurements in combination with finite element (FE) simulations, revealed prestress levels in the range 25 % to 82 % of the reinforcement steel yield strength, depending on the section tested. A comparison with theoretically calculated residual prestress forces, taking into account friction and timedependent losses, indicated values of the same order but with some inconsistencies.
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| 4. |
- Beygi, H., et al.
(författare)
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Vibration control of a high-speed railway bridge using multiple tuned mass dampers
- 2016
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Ingår i: IABSE Congress Stockholm, 2016. - : International Association for Bridge and Structural Engineering (IABSE). - 9783857481444 ; , s. 2519-2526
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Konferensbidrag (refereegranskat)abstract
- In the current article, the Banafjäl Bridge located on the Bothnia line (Botniabanan) in northern Sweden is studied. The bridge is a 40m long composite ballasted high-speed railway bridge. A 3D FE model of the bridge was developed using the commercial FE software, Abaqus. The FE model was calibrated against the measured data of the bridge. The dynamic response of the bridge's FE model was investigated under the dynamic load of the passing HSLM-A trains using modal dynamic analysis. The vertical acceleration induced by excitation of the passing train exceeded the permissible limit of 3.5 m/s2 for the speed range of 220-240 km/h. Thus, damping solutions using multiple tuned mass dampers (MTMDs) were investigated. According to the results of this study, a 4 tonnes MTMD system consisting of 5 parallel TMDs attached to the mid-span of the bridge could effectively control the undesired vibration of the bridge in both warm and cold seasons.
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| 5. |
- Blomfors, Mattias, 1990, et al.
(författare)
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Engineering Assessment Method for Anchorage in Corroded Reinforced Concrete
- 2016
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Ingår i: IABSE Congress Stockholm 2016. - : IABSE c/o ETH Hönggerberg. - 9783857481444 ; , s. 2109-2116
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Konferensbidrag (refereegranskat)abstract
- There is an increasing need for reliable methods to assess load-carrying capacity and remaining service life of existing infrastructure. Several previous research projects have resulted in a verified, simple 1D model for assessment of anchorage in corroded reinforced concrete structures. Previous verification has involved both experiments and detailed 3D NLFE analyses. To further develop the 1D model it needs to be extended to comprise more practical situations. In order to facilitate an efficient extension procedure in the future, the size of 3D NLFE model that is required to capture the bond behaviour between corroded reinforcement and concrete is investigated. Beam-end models and models of sub-sections were studied, and the results in terms of bond stress and crack pattern were compared. Preliminary results indicate good agreement for some situations; however for some cases a section model seems to overestimate the capacity.
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| 6. |
- Carolin, Anders, et al.
(författare)
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Innovative Intelligent Management of Railway Bridges, In2Rail : A European Horizon 2020 Project
- 2016
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Ingår i: IABSE CONGRESS, STOCKHOLM, 2016. - CH - 8093 Zürich, Switzerland. - 9783857481444 ; , s. 2552-2561
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Konferensbidrag (refereegranskat)abstract
- Innovative Intelligent Railways, In2Rail, is a European Horizon 2020 Project with the objective to enhance capacity, increase reliability and reduce Life Cycle Costs of European Railways. Bridges and Tunnels is the main focus in Work Package 4. The aim is to study, benchmark and further develop new Inspection Technologies in order to create more proactive maintenance procedures. In this paper some preliminary results are presented.
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| 7. |
- Danewid, Robert, et al.
(författare)
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Lessons from collapse of a 3-storey building in Sweden
- 2016
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Ingår i: IABSE Congress Stockholm, 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. - 9783857481444 ; , s. 870-877
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Konferensbidrag (refereegranskat)abstract
- The Swedish system for public quality control of structural design of buildings is one of the most liberal in the world. The full responsibility for this is given to the client in a building project. Consequences of this system are discussed in this paper via a case study of a recent collapse of a three-storey building. A number of gross errors in design and execution are described followed by a discussion about what went wrong in the design and construction process. The event can also be used to evaluate the efficiency of current requirements for robust design of buildings. The learnings drawn from this event are summarized.
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| 8. |
- Du, Guangli, 1985-, et al.
(författare)
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Evaluating the life cycle environmental impact of short span bridges
- 2016
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Ingår i: IABSE Congress Stockholm, 2016. - : International Association for Bridge and Structural Engineering (IABSE). - 9783857481444 ; , s. 1701-1707
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Konferensbidrag (refereegranskat)abstract
- Bridge infrastructure consumes large amount of energy and raw materials, leading to considerable environmental burdens. The traditional infrastructure construction prioritizes its technical and economic viability. In recent years, the society devotes an ever-increased attention to the environmental impact of the construction sector. Life cycle assessment (LCA) is a systematic method for assessing the environmental impact of products and systems, but its application in bridges is scarce. In Swede, most of the bridges are short spans and the type of concrete slabframe bridge (CFB) accounts for a large share. Soil steel composite bridge (SSCB) is a functional equivalent solution for CFB. In order to mitigate the environmental burdens of short span bridges, this paper performed a comparative LCA study between these two types of bridge. The results indicate that the initial material consumption is critical through the whole life cycle. The case of SSCB shows preferable environmental performance over CFB in most of the examined indicators.
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| 9. |
- Flansbjer, Mathias, et al.
(författare)
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Structural Concept of Novel RPC Sandwich Façade Elements with GFRP Connectors
- 2016
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Ingår i: IABSE Congress Stockholm 2016. - : IABSE c/o ETH Hönggerberg. - 9783857481444 ; , s. 2164-2171
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Konferensbidrag (refereegranskat)abstract
- The SESBE research project aims to develop novel smart sandwich façade elements with high insulating capabilities while providing a reduced thickness in conjunction with superior mechanical and durability properties. The present paper mainly focuses on the verification of the mechanical performance of the glass fibre reinforced polymer (GFRP) connectors in the façade element composed of reactive powder concrete (RPC) panels with foam concrete insulation between them. Because of the reduced thickness of the large façade elements, the performance of the connectors is critical for the entire structural concept. A description of structural performance and results based on experimental methods and finite element (FE) analysis are presented.
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| 10. |
- Ge, Yuanfei, et al.
(författare)
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A refined model of concrete carbonation by coupling of multi-factors
- 2016
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Ingår i: IABSE CONGRESS, STOCKHOLM, 2016. - H - 8093 Zürich, Switzerland. - 9783857481444 ; , s. 1198-1206
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Konferensbidrag (refereegranskat)abstract
- Studies on carbonation of concrete play an important role in accurately predicting the service life. However, most research work on carbonation of concrete was carried out in qualitative ways and seldom in quantitative ways. In this paper, based on conservation of mass of C3S(s), C2S(s), CSH(s), CH(s), CH(aq), CO2(aq) and CO2(g) and one-dimensional diffusion and reaction equation, a refined mathematical model of concrete carbonation composed of a series of partial differential equations (PDEs) was built. Corresponding MATLAB codes were developed with calculus of differences to solve the mathematical model of concrete carbonation. The results of the mathematical models in this paper agree very well with measurements, which show that this model can be used to accurately predict concrete carbonation as well as remaining service life of concrete bridges and other concrete structures
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