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- Alfredsson, Magnus, et al.
(författare)
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Funktionskriterier för vägkonstruktioner : Förstudie
- 2010
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Det projekt som här rapporteras har som syfte att identifiera och beskriva de svårigheter och möjligheter som totalentreprenader medför, respektive erbjuder, för alla parter. Målet är att utveckla totalentreprenader på ett sådant sätt att branschens effektivitet ökas. Denna rapport är en förstudie där det studerats vilka krav som byggherren ska ställa på utföraren av en vägkonstruktion i en totalentreprenad med funktionsansvar och hur utföraren ska verifiera kraven. Arbetet har genomförts med medlemmar från olika aktörer i branschen och omfattat främst litteraturstudier och intervjuer. Kunskaper och erfarenheter har sammanställts och analyserats för att slutligen kondenseras ned till ett antal förslag till fortsatt arbete.Förstudien har pekat ut ett antal områden som viktiga för att påskynda framtida utveckling av totalentreprenader:Terminologi – idag råder viss begreppsförvirringAnalys av funktionella krav i tidigare projektTrafikantkravMiljökravUtveckling av funktionella krav i samverkanVäghållarekonomiRegelbetingade begränsningar av funktionella kravUppföljning och underlättande av erfarenhetsackumuleringImplementering av nya mått och mätmetoder
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| 2. |
- Deckner, Fanny, 1984-
(författare)
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Ground vibrations due to pile and sheet pile driving : influencing factors, predictions and measurements
- 2013
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Ground vibrations due to pile driving are part of a complex process. Vibration is generated from the pile driver to the pile. As the pile interacts with the surrounding soil, vibrations are transferred at the pile-soil interface. The vibration propagates through the ground and interacts with structures, both above ground and underground. The vibration continues into the structure where it may disturb occupants and/or damage the structure.In this thesis the study of the vibration transfer process due to pile driving is limited to the vibration source and the wave propagation in the soil. Vibration transmission to adjacent buildings and structures is not studied. However, impact of vibrations on buildings is briefly discussed in the literature study.It is important to accurately predict the magnitude of ground vibrations that result from pile driving in urban areas, both over- and underestimated vibration levels lead to increased costs. A lot of research has been performed within this field of knowledge, but a reliable and acknowledged prediction model for vibrations induced by pile or sheet pile driving is still needed.The objective of the research project is to increase the knowledge and understanding in the field of ground vibrations due to impact and vibratory driving of piles and sheet piles. This research project also aims to develop a reliable prediction model that can be used by practising engineers to estimate vibration due to pile driving. This licentiate thesis presents the first part of the research project and aims to increase the knowledge and understanding of the subject and to form a basis for continued research work.The most important findings and conclusions from this study are:The main factors influencing vibrations due to pile and sheet pile driving are; (1) the vibrations transferred from the pile to the soil, (2) the geotechnical conditions at the site and (3) the distance from the source.The vibrations transmitted from the pile to the soil depend on the vibrations transferred to the pile from the hammer, the pile-soil interaction and the wave propagation and attenuation in the plastic/elasto-plastic zone closest to the pile.There is today no prediction model that fulfils the criteria of the “perfect” prediction model; reliable but yet easy to apply.Future research should study the transfer of vibrations at the pile-soil interface, including the generation of a plastic/elasto-plastic zone in the area closest to the pile and how that affects the transfer of vibrations from the pile to the soil.
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| 3. |
- Deckner, Fanny, 1984-, et al.
(författare)
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Ground vibrations due to pile and sheet pile driving : prediction models of today
- 2012
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Ingår i: Proceedings of the 22nd European Young Geotechnical Engineers Conference. - Gothenburg : Swedish Geotechnical Society. - 9789163714351 ; , s. 107-112
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Konferensbidrag (refereegranskat)abstract
- As part of aconstruction work pile and sheet pile driving unavoidably generates vibrations.As of today construction works are often located in urban areas and along withsociety’s increasing concern of environmental impact the need for vibrationprediction prior to construction is of immediate interest. This study presents a review of the predictionmodels existing today. For prediction of ground vibrations from pile and sheetpile driving there are roughly three different types of models; empirical models,theoretical models and engineering models. A prediction model should bereliable in all cases where it is meant to be used. It is also important thatit is relatively easy to use and that the input data is easily obtained. Thisstudy concludes that, as of today, there is a lack of such a model. Today’smodels either lack in reliability or require great amounts of input data,knowledge and skills as well as time and money. The findings within this study constitutethe initial part of an on-going research project at the division of Soil- and RockMechanics at the Royal Institute of Technology in cooperation with the DevelopmentFund of the Swedish Construction Industry and NCC Construction Sweden.
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| 4. |
- Deckner, Fanny, et al.
(författare)
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Markvibrationer vid spontning för Karlstad teater
- 2013
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Ingår i: Bygg och Teknik. - Stockholm : Förlags AB Bygg & teknik. - 0281-658X .- 2002-8350. ; :1, s. 25-29
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 8. |
- Ma, J., et al.
(författare)
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Deformation of anchor-sheet pile wall retaining system at deep excavations in soft soils overlying bedrock
- 2010
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Ingår i: Deep and underground excavations. - Reston, VA : American Society of Civil Engineers (ASCE). - 9780784411070 ; , s. 126-131
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Konferensbidrag (refereegranskat)abstract
- This contribution gives a case study on the deformations of anchor back-tied steel sheet pile walls and retained soils at deep excavations in soft soils overlying bedrock in Stockholm. Instrumentation results show the deformation of the retained soils is larger than that from similar case histories. The monitored anchor stresses increase quickly in the early stages of excavation and decease gradually to a constant value during later stages, while the lateral displacements of the sheet pile walls increase gradually. The results of both monitoring and numerical analysis show that this dynamic feature becomes weak as the thickness of the underlying soils is small. The decrease of the anchor stresses is mainly due to the flectional behavior of the sheet pile wall and the stress rotation in the retained soils.
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| 9. |
- Zalejska-Jonsson, Agnieszka, et al.
(författare)
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Energy-Efficient Technologies and the Building’s Saleable Floor Area : Bust or Boost for Highly-Efficient Green Construction?
- 2013
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Ingår i: Buildings. - : MDPI AG. - 2075-5309. ; 3:3, s. 570-587
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Tidskriftsartikel (refereegranskat)abstract
- When the external measurements of a building are fixed, an increase in external wall thickness caused by additional insulation, for example, will lead to loss of saleable floor area. This issue has to be taken into account in the evaluation of investment profitability. This paper examines how technologies used in energy-efficient residential building construction affect the available saleable floor area and how this impacts profitability of investment. Using a modeled building and an analysis of the average construction cost, we assessed losses and gains of saleable floor area in energy-efficient buildings. The analysis shows that the impact of potential losses or gains of saleable floor area should be taken into account when comparing investment alternatives: building energy-efficient green dwellings or building conventional ones. The results indicate that constructing energy-efficient buildings and introducing very energy-efficient technologies may be energy- and cost-effective even compared with conventional buildings. Employing new products in energy-efficient construction allows benefit to be drawn from lower energy consumption during the life cycle of the building, but also from the increase in saleable floor area.
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| 10. |
- Zalejska-Jonsson, Agnieszka, 1978-
(författare)
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In the Business of Building Green : The value of low-energy residential buildings from customer and developer perspectives
- 2013
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- An overarching aim of this research was to investigate the comprehensive value of green residential buildings as seen from two perspectives: that of the developer and that of the occupant (the customer). The dissertation consists of studies presented in seven papers. The studies conducted to investigate the developer’s perspective focused on construction cost and potential profit (papers I and VII). The customer’s perspective was examined with three approaches: the impact that energy and environment have on the decision to purchase (or rent) an apartment (paper V), willingness to pay for a green apartment (paper VI) and finally, the occupants’ satisfaction with the dwelling and indoor environment (papers II, III and IV). The first paper examines whether increased investment costs are profitable, taking into account the reduction in operating costs. The investment viability is approached by comparing investment in conventional and green residential building, particularly passive houses, using real construction and post-occupancy conditions. The increased investment costs in energy-efficient building were also the focus of paper VII. In this paper, the aim was to study how technologies used in energy-efficient residential building construction affect the available saleable floor area and how this impacts on the profitability of the investment. Potential losses and gains of saleable floor area in energy-efficient buildings were assessed using a modelled building and analysed with the help of the average construction cost.Papers II and IV present results from a study of occupants’ satisfaction and indoor environmental qualities. Both papers aim at comparing and analysing responses from occupants living in green and conventional buildings. Paper III focuses on a similar subject, but investigates occupants’ satisfaction among all adults living in multi-family buildings in Sweden, providing a national context for the results presented in papers II and IV. The results indicate that occupants are generally satisfied with their dwellings, but indoor environment proved to have a statistically significant effect on overall satisfaction.The results in paper V indicate that energy and environmental factors have a minor impact on customers’ decision to purchase or rent an apartment. However, availability of information on building energy and environmental performance may have an effect on the likelihood of the buyers’ being interested in environmental qualities and consequently an impact on their decision. The study presented in paper VI shows that customer interest in energy and environmental factors has a significant impact on stated willingness to pay for green dwellings. The paper discusses the stated willingness to pay for low-energy buildings and buildings with an environmental certificate and attempts to assess the rationale of the stated willingness to pay for low-energy dwellings given potential energy savings.
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