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Preferred solution, K12 – Appendix I Fatigue analyses
Get PDFThis report describes the work performed in consideration of fatigue capacity of the selected concept (K12) in the concept development work of a floating bridge over Bjørnafjorden.
Fatigue calculations have been performed for selected details in the bridge girder, the connection between columns and bridge girder/pontoons, mooring chains and stay cables.
Large parts of the assessed structures have an acceptable fatigue utilization. However, some details are found to have insufficient fatigue life and need additional measures.
Most notably these are the details in the bridge girder deck which are subjected to local traffic loads. A measure that has been applied during the current project phase is to increase the plate thickness in the deck to 16mm along the entire length of the bridge to increase fatigue robustness. Still, additional measures are needed in order to get acceptable fatigue lives. For future fatigue work it is proposed to developed a traffic load model based on historical/forecasted traffic data for the actual bridge location. This is expected to give a less conservative load model which will improve fatigue life.
A sensitivity study has been performed on the traffic load model to identify the load reduction required to achieve acceptable fatigue lives. Several of the typical details in the deck currently have a calculated fatigue life of around 30 years. The required load model reduction to achieve acceptable fatigue life for these details is to use the medium range traffic distribution and reduce axle loads to 75% of the full FLM4 axle loads.
Most of the girder deck details are expected to get sufficient fatigue life with a moderate reduction in the traffic load model. However, for the cut-out detail in the transverse frames around the longitudinal trapezoidal stiffeners additional measures are required. For this detail further design optimization remains to get a fatigue friendly design. Another measure that has been proposed is to utilize the asphalt stiffness in the local FE-analyses, which is believed to give reduced stresses due to a more realistic transfer of loads onto the steel deck.
Another detail which currently have insufficient fatigue life is the connection between bridge girder and columns in the high part of the floating bridge. Here, insufficient fatigue life is found at axis 3 and 4 in the vicinity of the cast pieces at the top corners of the columns. At Axis 3 the calculated fatigue life is 44 years and 47 years for the girder side and column side of the corner respectively. At Axis 4 the calculated fatigue life is 89 years (column side). The recommended measure to achieve acceptable fatigue life for these locations is to increase structural dimensions locally. For future fatigue work it is also recommended that this connection is assessed by a more refined calculation method.Statens vegvesen Vegdirektorate
STRATMOD Brukerveiledning til storsonemodellen
Get PDFProsjektet STRATMOD er et samarbeid mellom Ruter, Jernbanedirektoratet, Vegdirektoratet, Urbanet Analyse, SINTEF, NTNU og VTI. Prosjektet er finansiert av det Regionale Forskningsfondet Hovedstaden RFFH. Hensikten med prosjektet har vært å utvikle et strategisk modellverktøy for kunne gjennomføre bedre analyser av ulike transportscenarier i byområdene. STRATMOD består av tre delmoduler; storsonemodellen, finansieringsmodellen og optimaliseringsmodellen. De tre delmodellene er dokumentert i hvert sitt dokumentasjonsnotat. Dette notatet gjennomgår en enklere brukerveiledning for storsonemodellen, som fokuserer på praktisk bruk av modellen
Summary documentation 2017 : For construction projects completed in 2017
No full textRapporten inneholder byggekostnader for prosjekter som ble åpnet for trafikk i 2017.Statens vegvesen Vegdirektorate
K12 - Structural response analyses
No full textIn this reports a description of the applied loads are presented along with the limit states and requirement that have been applied in design.
The limit state response is also presented together with the calculated capacity with regards to the requirements given in design basis.
In general the structure shows good capacity with regards to;
- Comfort requirement
- Global stability
- ULS/ALS response
- Deformation requirements (rotation/vertical)
Some optimization should be done with regards to rotation from traffic. Besides this, all requirements presented in this report are fulfilled.Statens vegvesen Vegdirektorate
Preferred solution, K12 – Appendix K Design of Floating Bridge Part
Get PDFThis appendix outlines the design of the floating bridge part for the concept K12.
The floating bridge part consists of the bridge girder, columns and pontoon.Statens vegvesen vegdirektorate
Complete Street Planning : A selection of relevant publications
No full textTransportplanleggingen har i løpet av de siste årene gått fra sektortenkning til å fokusere på helhetlig utforming og tilrettelegging for miljøvennlig transport. Helhetlig gateplanlegging handler om å ivareta alle trafikantgrupper og forhold i gata gjennom prioriteringer i og gjennom byområder. Da er det viktig å se hovednett for ulike trafikanter og deres behov i sammenheng, og tenke helhetlig på tvers av fag. Det finnes mange publikasjoner som er relevant for helhetlig gateplanlegging. Disse gir retningslinjer for planlegging og utforming av gater i byer.Statens vegvesen Vegdirektorate
Styring av vegprosjekter
Get PDFDenne Håndboka er en oppdatering av 2018-utgaven.Dette er en håndbok i Statens vegvesens håndbokserie. Vegdirektoratet har ansvaret
for utarbeidelse og ajourføring av håndbøkene. Denne håndboka finnes kun digitalt (PDF)
på Statens vegvesens nettsider, www.vegvesen.no. Statens vegvesens håndbøker utgis på
to nivåer:
Niva 1: Oransje eller grønn fargekode på omslaget – omfatter normal (oransje farge)
og retningslinje (grønn farge) godkjent av overordnet myndighet eller av Vegdirektoratet etter fullmakt.
Niva 2: Bla fargekode på omslaget omfatter veiledning godkjent av den avdeling som har fått fullmakt til dette i Vegdirektoratet.Statens vegvesenupdatedVersio
Calibration and development of a numerical method for frost protection
Get PDFMasters`thesis in MTBYGG. NTNT- Norwegian University of Science and Technology Department of Civil and Environmental EngineeringFrost heave and spring thaw can be critical contributors to pavement deterioration in seasonal frost regions. Several numerical programs are available to predict frost penetration depth, but the lack of fixed material parameters often leads to unreliable estimates and hence inaccurate frost design. To prevent detrimental frost heave and spring thaw conditions in the foundation layers, adapting numerical models to site-specific conditions is essential. This study uses the module Heat transfer in porous media in COMSOL Multiphysics to model heat flux in seven full-scale road sections with different frost protective layers. Numerical models are built for each section, using actual ambient air temperature as the top boundary condition, and material properties are adjusted to fit temperature profiles measured over seven weeks. The models fit field data with an average accuracy of 0.56 °C. The final thermal properties for each material in the road structure are presented for use in further calibration. It is assumed that applying continuous surface measurements as the top boundary condition would be a key improvement for future work. A further recommendation is to increase the modeling period, preferably to a whole year consisting of a cold winter.Statens vegvesen Vegdirektorate
Repaving of public roads in the Eastern Region of Norway in 2019 : Repaving contracts and pavement condition
No full textRapporten gir oversikt over vedlikeholdsasfaltering 2019Statens vegvesen Region øs
Saltstabiliering av kvikkleire, SAK - Arbeidspakke 1: Installasjonsmetoder
No full textDenne rapporten omhandler Arbeidspakke 1 Installasjonsmetoder. Målsetningen med arbeidspakken er å finne skånsomme installasjonsmetoder for saltbrønner i kvikkleire. Ulike installasjonsmetoder er testet ut på National GeoTest Site Flotten i Trondheim. Denne rapporten beskriver utstyr, prosedyrer og hovedresultater fra dette arbeidet. Statens vegvesen Region sør og NGI har utført installasjonsarbeidene ved bruk av eget utstyr