Blar i NTNU Open på forfatter "Rønnquist, Anders"
-
Dynamic response of tall timber buildings under service load. Modal analysis-based experimental investigations and modelling
Tulebekova, Saule (Doctoral theses at NTNU;2023:294, Doctoral thesis, 2023)The rising awareness of sustainability importance has led to wider adoption of timber in structural design. While there is a growing number of multi-storey timber buildings, there is still a lack of confidence by designers ... -
The Effects of Spatially Distributed Damping on the Contact Force in Railway Pantograph-Catenary Interactions
Song, Yang; Jiang, Tengjiao; Rønnquist, Anders; Nåvik, Petter Juell; Frøseth, Gunnstein Thomas (Peer reviewed; Journal article, 2021)According to field measurements, the damping ratio of a railway catenary varies along the span length and shows an inherent uncertainty. In numerical simulations, it is common to assume a constant damping ratio. Herein, a ... -
Eksperimentell dynamisk analyse av en liten CLT-konstruksjon
Sekkesæter, Eirik; Fossheim, Lars (Master thesis, 2021)Denne masteroppgaven føyer seg inn under prosjektet DynaTTB som ønsker å undersøke dempingsegenskaper for høyhus av tre. Et av prosjektets mål er å kartlegge effekten av forbindelser på stivheten og energi-dissipasjonen, ... -
Eksperimentell dynamisk analyse av en liten CLT-konstruksjon Herunder evalueringen av betydningen til forbindelser på dempingskoeffisient, egenfrekvenser og egenmoder
Fossheim, Lars; Sekkesæter, Eirik (Master thesis, 2021)Denne masteroppgaven føyer seg inn under prosjektet DynaTTB som ønsker å undersøke dempingsegenskaper for høyhus av tre. Et av prosjektets mål er å kartlegge effekten av forbindelser på stivheten og energi-dissipasjonen, ... -
Estimating and Predicting Dynamic Properties of Stress-laminated Timber Bridges
Kastet, Anders; Alnaser, Ahmad Adnan (Master thesis, 2022)Populariteten til tverrspente limtrebuer har økt den siste tiden grunnet rask byggetid og god tilpasningsevne. Treverk er betraktet som et karbonnøytralt byggemateriale og dermed ansett som et sentralt byggemateriale for ... -
Estimating and Predicting Dynamic Properties of Stress-laminated Timber Bridges
Alnaser, Ahmad Adnan; Kastet, Anders (Master thesis, 2022)Populariteten til tverrspente limtrebuer har økt den siste tiden grunnet rask byggetid og god tilpasningsevne. Treverk er betraktet som et karbonnøytralt byggemateriale og dermed ansett som et sentralt byggemateriale for ... -
Evolution of load conditions in the Norwegian railway network and imprecision of historic railway load data
Frøseth, Gunnstein Thomas; Rønnquist, Anders (Journal article; Peer reviewed, 2018)This article describes historic load conditions in the Norwegian railway network to improve estimates of the remaining service life of bridges. Data on rolling stock, traffic and infrastructure throughout the history of ... -
Experiences from the five-year monitoring of a long-span pontoon bridge: What went right, what went wrong and what?s next?
Kvåle, Knut Andreas; Øiseth, Ole; Rønnquist, Anders (Journal article; Peer reviewed, 2019)The Bergsøysund Bridge is a 930-metre-long end-supported pontoon bridge located in Norway, and has been the target of a five-year-long, extensive monitoring program. Herein, we will describe the unique structural characteristics ... -
Exploring Surrogate Modeling as a Tool for Structural Assessment in Conceptual Design
Skjærseth, Isak Edvard; Bergstrøm, Glenn Edson (Master thesis, 2021) -
Field investigations of crosswinds and vehicle-driver response on bridges
Reymert, Sebastian (Doctoral theses at NTNU;2023:41, Doctoral thesis, 2023)There are currently no scientific, evidence-based guidelines for designing windrelated traffic regulations on Norwegian road bridges. The topic of crosswindexposed vehicles on bridges has been studied theoretically, ... -
Geometry deviation effects of railway catenaries on pantograph–catenary interaction: a case study in Norwegian Railway System
Song, Yang; Jiang, Tengjiao; Nåvik, Petter Juell; Rønnquist, Anders (Peer reviewed; Journal article, 2021)This paper presents a non-contact measurement of the realistic catenary geometry deviation in the Norwegian railway network through a laser rangefinder. The random geometry deviation is included in the catenary model to ... -
Global Buckling Reliability Analysis of Slender Network Arch Bridges: An Application of Monte Carlo-Based Estimation by Optimized Fitting
Rønnquist, Anders; Næss, Arvid (Chapter, 2017)Network arch bridges are extremely slender bridge structures with a very efficient 16 load-carrying structure. This configuration can carry loads that are several times greater 17 than traditional tied-arch bridges with ... -
A Grasshopper Plugin for Finite Element Analysis with Solid Elements and Its Application on Gridshell Nodes
Haakonsen, Sverre Magnus; Dyvik, Steinar Hillersøy; Luczkowski, Marcin; Rønnquist, Anders (Peer reviewed; Journal article, 2022)Linking architectural models to structural analyses can be demanding and time-consuming, especially when the architectural models cannot be accurately analysed using readily available one- or two-dimensional finite elements. ... -
Gridshell Nodes. Exploring options for aluminium nodes in timber gridshells
Dyvik, Steinar Hillersøy (Doctoral theses at NTNU;2023:136, Doctoral thesis, 2023)Norsk sammendrag Tre-gitterskal er konstruksjonar som kombinerer fordelar med trekonstruksjon som låg bunden energi med konstruksjonseffektiviteten til ein skalkonstruksjon. I tillegg har dei visuelle kvalitetar på grunn ... -
Gridshells in Recent Research—A Systematic Mapping Study
Dyvik, Steinar Hillersøy; Manum, Bendik; Rønnquist, Anders (Peer reviewed; Journal article, 2021)Gridshells are shells where the structural system is some kind of grid of linear members rather than a surface. With today’s focus on environmentally friendly solutions, gridshells have gained increased relevance as ... -
A heuristic wear model for the contact strip and contact wire in pantograph – Catenary interaction for railway operations under 15 kV 16.67 Hz AC systems
Derosa, Stefano; Nåvik, Petter Juell; Collina, Andrea; Bucca, Giuseppe; Rønnquist, Anders (Peer reviewed; Journal article, 2020)The sliding contact between the pantograph and catenary allows the correct operation of electric trains. However, this contact induces wear on both the components involved in the process, namely the contact strip on the ... -
Identification of short-wavelength contact wire irregularities in electrified railway pantograph–catenary system
Song, Yang; Rønnquist, Anders; Jiang, Tengjiao; Nåvik, Petter Juell (Peer reviewed; Journal article, 2021)The effect of two common types of short-wavelength irregularities (local imperfections and periodic short-wavelength irregularities) of the railway catenary on the pantograph–catenary interaction performance are studied ... -
Implementation of Tetrahedral Elements in a Finite Element Method Plug-in for Grasshopper
Wulff, Markus Aleksander (Master thesis, 2022)I nyere tid har arkitekter og bygningsingeniører designet komplekse gitterskall ved hjelp av form-finningsmetoder i det algoritmiske modelleringsverktøyet Grasshopper. Knutepunktene i gitterskall påvirker i stor grad den ... -
Improved finite element model updating of a full-scale steel bridge using sensitivity analysis
Svendsen, Bjørn Thomas; Petersen, Øyvind Wiig; Frøseth, Gunnstein Thomas; Rønnquist, Anders (Journal article; Peer reviewed, 2021)There are many uncertainties related to existing bridges that are approaching or have exceeded their original design life. Lifetime extension analysis of bridges should be based on validated numerical models that can be ... -
Indirect monitoring of vortex-induced vibration of suspension bridge hangers
Cantero, Daniel; Øiseth, Ole; Rønnquist, Anders (Journal article; Peer reviewed, 2017)Wind loading of large suspension bridges produces a variety of structural responses, including the vortex-induced vibrations of the hangers. Because it is impractical to monitor each hanger, this study explores the possibility ...