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  • Sundell, Jonas, et al. (författare)
  • Comprehensive risk assessment of groundwater drawdown induced subsidence
  • 2019
  • Ingår i: Riskhantering vid grundvattensänkning i Varbergstunneln.
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a method for risk assessment of groundwater drawdown induced land subsidence when planning for sub-surface infrastructure. Since groundwater drawdown and related subsidence can occur at large distances from the points of inflow, the large spatial extent often implies heterogeneous geological conditions that cannot be described in complete detail. This calls for estimation of uncertainties in all components of the cause-effect chain with probabilistic methods. In this study, we couple four probabilistic methods into a comprehensive model for economic risk quantification: a geostatistical soil-stratification model, an inverse calibrated groundwater model, an elasto-plastic subsidence model, and a model describing the resulting damages and costs on individual buildings and constructions. Groundwater head measurements, hydraulic tests, statistical analyses of stratification and soil properties and an inventory of buildings are inputs to the models. In the coupled method, different design alternatives for risk reduction measures are evaluated. Integration of probabilities and damage costs result in an economic risk estimate for each alternative. Compared with the risk for a reference alternative, the best prior alternative is identified as the alternative with the highest expected net benefit. The results include spatial probabilistic risk estimates for each alternative where areas with significant risk are distinguished from low-risk areas. The efficiency and usefulness of this modelling approach as a tool for communication to stakeholders, decision support for prioritization of risk reducing measures, and identification of the need for further investigations and monitoring are demonstrated with a case study of a planned railway tunnel in Varberg, Sweden.
  • Adam, Abderisak, 1988-, et al. (författare)
  • How task heterogeneity and frequency relates to knowledge codification: Evaluating the Shared Construction Guidelines (SCG) of 24 Swedish Public Client Organizations
  • 2017
  • Ingår i: 9th Nordic Conference on Construction Economics and Organization. ; s. 1-9
  • Konferensbidrag (refereegranskat)abstract
    • Over a sustained period of time, organizational theorists have argued that public sector organizationsare more inefficient than their private counterparts. Recent studies have explained these inefficienciesas the result of having to do with capabilities rather than resources thereby calling for an improvementof the capabilities of public organizations. A key mechanism for achieving such improvements is thearticulation and codification of knowledge. This study examines an attempt at codifying knowledge inthe form of a set of shared construction guidelines (SCG) employed by 24 large public clientorganizations in the Municipality of Gothenburg, Sweden. Specifically, these guidelines are viewedwith respect to the framework of Zollo and Winter (2002) in terms of how organizations with high taskheterogeneity and low task frequency can more effectively develop dynamic capabilities through thedeliberate learning mechanism of knowledge codification. Preliminary results indicate that taskfrequency and organizational size are stronger indicators than heterogeneity in deciding whether apublic client organization utilizes knowledge codification systems such as the SCG.
  • Adam, Abderisak, 1988- (författare)
  • Managing construction challenges: Viability of a dynamic capabilities approach for the public client
  • 2016
  • Licentiatavhandling (övrigt vetenskapligt)abstract
    • Construction clients in the public sector face a large number of challenges in designing, procuring and managing construction projects in a manner that is conducive to the organization’s overall goals. In particular, clients have faced challenges in delivering projects that satisfied the projects’ goals with respect to cost overruns, delays and sustainable construction. The role of the client in managing these challenges has more recently been emphasized with a growing number of studies and governmental reports calling for the development of the client’s capabilities.This thesis examines the capabilities of the construction client through a dynamic capabilities framework, particularly with respect to the activities of sensing, seizing and transforming. Furthermore, the thesis explores whether the concept of dynamic capabilities is a viable approach for understanding how to manage the clients’ capabilities in a way that ensures that construction-related challenges are addressed. The thesis is based primarily on a case study of a large public construction client located in Sweden.Findings are presented in three appended papers. The thesis concludes with a discussion on the viability of using a dynamic capabilities framework in the specific case described in this thesis. It is argued that the concept of dynamic capabilities is inadequate for capturing the specific context in which public client organizations operate. Suggestions for alternative approaches to understanding the management and development of capabilities are then discussed.
  • Williams Portal, Natalie, 1986-, et al. (författare)
  • Bending behaviour of novel Textile Reinforced Concrete-foamed concrete (TRC-FC) sandwich elements
  • 2017
  • Ingår i: Composite Structures. - 0263-8223. ; 177, s. 104-118
  • Tidskriftsartikel (refereegranskat)abstract
    • A novel sandwich element design consisting of two facings made of carbon reinforced Textile Reinforced Concrete (TRC), a low density foamed concrete (FC) core and glass fibre reinforced polymer (GFRP) connecting devices was experimentally investigated according to quasi-static and cyclic quasi-static four-point bending. Optical measurements based on Digital Image Correlation (DIC) were taken during testing to enable a detailed analysis of the bending behaviour and level of composite action. A model, verified by the experiments, was developed based on non-linear finite element analysis (NLFEA) to gain further insight on the failure mechanisms. Under both loading conditions, the bending behaviour of the TRC-FC composite elements was characterized by favourable load bearing capacity, partial composite action, superior ductility and multiple fine cracking. The connecting devices were found to be the critical elements causing the initial failure mechanism in the form of localized pull-out within an element.
  • Dymitrow, Mirek, et al. (författare)
  • Crossing dichotomies and breaking mental patterns: Green business development when all else fails?
  • 2017
  • Ingår i: 8th International Scientific Conference “Rural Development 2017: Bioeconomy Challenges”, 23–24 November, 2017 Kaunas, Lithuania.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Obtaining sustainable and inclusive societal organization is not merely a simple matter of ‘doing it’ by subscribing to some winning formula. Given that conceptual frameworks always guide our thoughts, judgments and actions (Latour, 2013; Harvey, 1996; Dennett, 1993), the ways in which we relate to concepts chosen to serve as guiding forces for future development will eventually determine its outcome. As scholarly evidence continuously suggests the concepts ‘rural’ and ‘urban’ are increasingly recognized as artificial barriers for conducting sound and integrated development endeavors in a globalized reality of interconnectedness. In line with the Sustainable Development Goals, which aim to eradicate poverty, shield the planet and safeguard prosperity for all, commitment to universal access to healthy food year round has become an important agenda point. This, however, has been exacerbated by binary thinking and separate ways of doing policy. This paper aims to share experiences from a unique project launched in the northern parts of Gothenburg, Sweden’s second largest city. While the area offers ample resources and immense opportunities for areal economies, it at the same time remains one of Gothenburg’s most segregated, with high levels of unemployment, ill health and crime. The uniqueness of the project lies not only in its way of abridging the rural-urban divide, but also by consciously deferring from the debilitating rhetoric of previous ‘immigrant policies’, and instead focusing on agricultural productivity, small-scale food producers and sustainable food strategies. Such exhortations to bridge between philosophical and material polarities, however, have not come without conceptual and practical challenges, something this paper aims to subsume and open up to debate.
  • Adl-Zarrabi, Bijan, 1959-, et al. (författare)
  • Safe and Sustainable Coastal Highway Route E39
  • 2016
  • Ingår i: Safe and ice-free bridges using renewable energy sources.
  • Konferensbidrag (refereegranskat)abstract
    • The project “Coastal Highway Route E39” have a mandate to, investigate how infrastructure can exploit renewable energy to reduce environmental footprint. Three PhD projects were initiated on this subject at Chalmers University of Technology by Norwegian public road administration. Results in this paper conclude that (1) Life Cycle Assessment should have a geographical dimension with respect to assumptions and input data, (2) there are substantial potential to reduce the CO2 emissions from the E39, especially when considering an electrification, and (3) the harvested energy from hydronic pavement system can be enough for maintaining ice-free roads in Nordic countries.
  • Crocetti, Roberto, et al. (författare)
  • Stress-laminated-timber decks : state of the art and design based on Swedish practice
  • 2016
  • Ingår i: European Journal of Wood and Wood Products. - Springer. - 0018-3768. ; 74:3, s. 453-461
  • Tidskriftsartikel (refereegranskat)abstract
    • Stress-laminated-timber (SLT) bridge decks are a valid alternative to conventional short- and medium-span bridges in terms of cost and performance. SLT decks are made from a number of planks or glulam beams positioned side by side and stressed together using high-strength steel bars. A concentrated load can therefore be distributed from the loaded beams onto adjacent beams due to the resisting friction caused by the pre-stressing of all beams in the deck. This paper describes the state of the art of SLT bridge decks, with special emphasis on Swedish practice. The effect of butt joints on deck deflection and solution applied to accommodate the loss of pre-stress are shown. Simple design tools for the preliminary design of road bridges are illustrated. Best practice with regard to some detailing, water protection and durability is also discussed. Finally, possible developments of SLT bridges are discussed.
  • Kharazmi, Parastou, 1977- (författare)
  • Experimental evaluation of a rubber-epoxy polymeric system used in the rehabilitation of sewer infrastructure- Dataset
  • 2019
  • Annan publikation (övrigt vetenskapligt)abstract
    • <p>This dataset includes data related to water sorption analyses to support research findings stated in the article:"Experimental evaluation of a rubber-epoxy polymeric system used in the rehabilitation of sewer infrastructure: a case study in Sweden" with the following abstract: </p><p>one rehabilitation method used to prolong the service life of waste-water sewer pipes in residential buildings in Sweden is to apply a coating, based on an epoxy resin system that is modified with rubber, to the inner surface of the deteriorated pipe. To understand the material’s performance and stability in operation, the properties of the material were studied in the laboratory under water and air aging conditions. Changes in the material were monitored by conducting thermal, mechanical and water absorption analyses. Results showed that the mechanical properties of the material after water aging decreased significantly compared to material that was subject to dry aging. The material absorbed water over a long period of time, and the water uptake rate was found to be highest at higher temperatures. The material can thus be said to be more sensitive when high temperature is combined with water exposure; therefore, the performance of this liner material is expected to be better in places where constant exposure to water is not required.</p>
  • Aygül, Mustafa, 1970-, et al. (författare)
  • A comparative study of different fatigue failure assessments of welded bridge details
  • 2013
  • Ingår i: International Journal of Fatigue. - 0142-1123. ; 49:0, s. 62-72
  • Tidskriftsartikel (refereegranskat)abstract
    • Five different welded joints frequently used in steel bridges have been selected to investigate the accuracy and applicability of three fatigue assessment methods. The first method, also categorised as the global method, is the nominal stress method, while the more advanced methods are the hot spot and the effective notch stress methods. Solid element based finite element models for welded bridge details were created by following the modelling requirements of each fatigue assessment method. A statistical evaluation based on the results of the finite element analyses and the fatigue test data collected from the literature was performed to determine the mean and characteristic fatigue strength. In addition, the standard deviation for each data series was also determined to conclude how well each method describes the fatigue strength of each welded detail. A method with a lower standard deviation is regarded as more accurate. Moreover, the evaluated results from each method were compared with the recommended fatigue strength values in the Eurocode 3 (EN 1993-1-9:2005) and IIW codes. In the light of the test results in this study, it appears that the codes are in reasonable agreement with the test data, even though a few examples of the opposite occurred. The conclusion based on the revised results in this article indicates that the nominal stress method yields satisfactory results, despite its simplicity. When considering the effort involved in creating FE models for numerical analysis, it seems clear that the choice of the nominal method is fairly acceptable.
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