Article
Engineering, Civil
Tor M. Lystad, Aksel Fenerci, Ole Oiseth
Summary: This paper proposes a new algorithm for efficiently solving the full long-term problem through sequential Gaussian Process (GP) surrogate modeling. The algorithm trains a GP surrogate model to replace the buffeting response calculation in wind-sensitive structures, improving computational efficiency and accuracy of the response estimate. The algorithm is demonstrated on a practical design problem and compared with other methods, showing comparable efficiency and enhanced accuracy.
ENGINEERING STRUCTURES
(2023)
Article
Biodiversity Conservation
Ankit Shekhar, Lukas Hortnagl, Nina Buchmann, Mana Gharun
Summary: In this study, the long-term changes in forest NEP resistance and NEP recovery in response to extreme atmospheric dryness were quantified using data from 60 forest sites across the world. The results showed that forest types, LAI, and local VPD conditions explained over 50% of variance in both NEP resistance and NEP recovery, with drier sites showing higher NEP resistance and NEP recovery.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Engineering, Civil
Dario Fernandez Castellon, Aksel Fenerci, Ole Oiseth, Oyvind Wiig Petersen
Summary: Site measurements of long-span bridges' buffeting responses often show discrepancies with analytical models, mainly due to neglected variability in the wind's turbulence field. This paper proposes a full long-term analysis framework based on importance sampling Monte Carlo simulations to investigate the extreme buffeting response of a suspension bridge during the design phase. The results suggest a 30% larger extreme response than current design guidelines, highlighting the importance of considering turbulence and loading variabilities.
ENGINEERING STRUCTURES
(2022)
Article
Construction & Building Technology
Xiong Xiao, Quanwang Li
Summary: This paper develops a two-stage updating framework to incorporate measured data into existing models for a more realistic modeling of deterioration process of RC structures in marine environment. It uses observed data of chloride content profile and steel bar corrosion depths from one field inspection to construct likelihood functions in the two updating stages. Results from the first and second updating stages are compared, and the impact of two inspections on updating effects is investigated.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Fei Kang, Xi Liu, Junjie Li, Hongjun Li
Summary: This paper proposes a response surface model based on kernel extreme learning machine for parameter inverse analysis of concrete dams. The effectiveness of this method is verified through experiments, showing high accuracy at a low computation cost.
ENGINEERING STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Adrian Esteban-Arranz, Ana Raquel de la Osa, Wendy Eunice Garcia-Lorefice, Javier Sacristan, Luz Sanchez-Silva
Summary: This study optimized the performance of cement-based epoxy resin coatings in aggressive environments by functionalizing with different nanoparticles. The nanomodified coatings with activated carbon and silica showed the best adherence and abrasion resistance properties.
Article
Engineering, Marine
Yuliang Zhao, Sheng Dong
Summary: This paper presents an extension of the alternative environmental contour approach based on inverse first-order reliability theory in a three-dimensional model. It considers short-term extreme response uncertainties and investigates long-term extreme tension under wave excitation loads. The applicability of the load assessment models is demonstrated using a case study of a platform, and the results are compared with one- and two-dimensional environmental contour-based models.
SHIPS AND OFFSHORE STRUCTURES
(2022)
Article
Engineering, Civil
Tor M. Lystad, Aksel Fenerci, Ole Oiseth
Summary: The study suggests that the current design practice for wind excited long-span bridges, using short-term extreme response analyses with deterministic turbulence parameters, may significantly underestimate the long-term design stresses. Both the variability of the turbulence parameters and the uncertainty in the short-term extreme response are important factors to consider when estimating design stresses. The comparison between long-term extreme acceleration responses and the measured responses at the Hardanger Bridge shows considerable improvements to the current design practice.
ENGINEERING STRUCTURES
(2021)
Article
Green & Sustainable Science & Technology
Omar El Beshbichi, Henrik Rodstol, Yihan Xing, Muk Chen Ong
Summary: The modified environmental contour method (MECM) is assessed for predicting the extreme response of a floating wind turbine concept. The results show that MECM can reduce underpredictions and provide accurate analysis compared to the full long-term analysis (FLTA).
Article
Green & Sustainable Science & Technology
Andreas F. Haselsteiner, Malte Frieling, Ed Mackay, Aljoscha Sander, Klaus-Dieter Thoben
Summary: The study found that the environmental contour method currently recommended in the IEC design standard for offshore wind turbines can significantly underestimate the 50-year return value of response variables, mainly due to the method used to construct the contour, neglecting serial correlation in environmental conditions, and neglecting the short-term variability in the response.
Article
Engineering, Civil
Bai Xiao-dong, Guo Wei-wei, Yang Can, Luo Han-bing
Summary: This paper investigates the long-term extreme response of a fish cage using the environmental contour method. Results indicate that the 1D method greatly underestimates the extreme values, while the 2D environmental contour method with a higher percentile level provides reasonable estimations and seems to be suitable for the long-term value analysis. Sensitivity studies show that the mooring arrangement and the bending stiffness have great effects on the bending moment and the mooring force, and the mooring line pre-tension has minor effects on the fish cage response.
CHINA OCEAN ENGINEERING
(2021)
Article
Engineering, Marine
Yuliang Zhao, Sheng Dong
Summary: This study proposes a more feasible approach to evaluate the long-term extreme response of floating-structure mooring system designs, combining immediate integration with Monte Carlo simulations. By fitting the short-term extreme response distribution parameters and conducting case studies on a semi-submersible platform, the effectiveness of this method is demonstrated, showing the necessity for stricter design standards in long-term analysis.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART M-JOURNAL OF ENGINEERING FOR THE MARITIME ENVIRONMENT
(2021)
Review
Materials Science, Multidisciplinary
Abdulhakim Adeoye Shittu, Athanasios Kolios, Ali Mehmanparast
Summary: This paper discusses the probabilistic fracture mechanics approach as it accurately represents the fatigue reliability encountered in the design of current structures. Analytical/approximate methods like FORM/SORM strike a good balance between accuracy and efficiency, but they may be inaccurate for highly non-linear systems, so various modifications have been proposed for enhanced accuracy.
Article
Engineering, Civil
Claudia R. Corona, Shemin Ge, Suzanne P. Anderson
Summary: Extreme precipitation events have a significant impact on soil-water and groundwater storage globally. In this study, we examined the response of water-table depth to extreme precipitation events for 17 representative cases across the United States. Our results showed that the displacement of water-table depth was not directly controlled by the amount of extreme precipitation, but rather inversely related to available porosity. Additionally, the recession time of water-table was found to be inversely related to hydraulic diffusivity.
JOURNAL OF HYDROLOGY
(2023)
Article
Computer Science, Artificial Intelligence
Hyo Seon Park, Taehoon Hong, Dong-Eun Lee, Byung Kwan Oh, Branko Glisic
Summary: This study presents a model for predicting long-term strain in concrete structures using weather data. A convolutional neural network is used to establish the relationship between weather and strain data, and different types of weather data are utilized to determine the significant factors for concrete deformation prediction.
EXPERT SYSTEMS WITH APPLICATIONS
(2022)
Article
Mathematics, Interdisciplinary Applications
Tore A. Helgedagsrud, Yuri Bazilevs, Kjell M. Mathisen, Ole A. Oiseth
COMPUTATIONAL MECHANICS
(2019)
Article
Computer Science, Interdisciplinary Applications
Tore A. Helgedagsrud, Yuri Bazilevs, Artem Korobenko, Kjell M. Mathisen, Ole A. Oiseth
COMPUTERS & FLUIDS
(2019)
Article
Engineering, Civil
Bartosz Siedziako, Ole Oiseth
ENGINEERING STRUCTURES
(2019)
Article
Engineering, Mechanical
Tore A. Helgedagsrud, Ido Akkerman, Yuri Bazilevs, Kjell M. Mathisen, Ole A. Oiseth
JOURNAL OF ENGINEERING MECHANICS
(2019)
Article
Engineering, Mechanical
O. W. Petersen, O. Oiseth, E. Lourens
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Engineering, Ocean
Thomas Viuff, Bernt Johan Leira, Xu Xiang, Ole Oiseth
APPLIED OCEAN RESEARCH
(2019)
Article
Engineering, Civil
Tore A. Helgedagsrud, Yuri Bazilevs, Kjell M. Mathisen, Ole A. Oiseth
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2019)
Article
Construction & Building Technology
Giorgio Diana, Stoyan Stoyanoff, Ketil Aas-Jakobsen, Andrew Allsop, Michael Andersen, Tommaso Argentini, Miguel Cid Montoya, Santiago Hernandez, Jose Angel Jurado, Hiroshi Katsuchi, Igor Kavrakov, Ho-Kyung Kim, Guy Larose, Allan Larsen, Guido Morgenthal, Ole Oiseth, Simone Omarini, Daniele Rocchi, Martin Svendsen, Teng Wu
STRUCTURAL ENGINEERING INTERNATIONAL
(2020)
Article
Engineering, Civil
O. W. Petersen, O. Oiseth, E. Lourens
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2020)
Article
Engineering, Civil
Thomas Viuff, Xu Xiang, Bernt Johan Leira, Ole Oiseth
JOURNAL OF BRIDGE ENGINEERING
(2020)
Article
Engineering, Civil
Tor M. Lystad, Aksel Fenerci, Ole Oiseth
ENGINEERING STRUCTURES
(2020)
Article
Acoustics
Knut Andreas Kvale, Ole Oiseth
Summary: In this study, numerical predictions of the dynamic response of an existing floating pontoon bridge are compared with measured data. Hydrodynamic analysis and a beam model are combined in a finite element method framework for stochastic response prediction. The study emphasizes predictions under serviceability and ultimate limit state conditions, discussing the overall quality of the prediction model.
SHOCK AND VIBRATION
(2021)
Proceedings Paper
Engineering, Civil
Knut Andreas Kvale, Ole Oiseth, Anders Ronnquist
DYNAMICS OF CIVIL STRUCTURES, VOL 2
(2019)
Article
Construction & Building Technology
A. Zasso, T. Argentini, S. Omarini, D. Rocchi, O. Oiseth
Article
Engineering, Civil
Oyvind Wiig Petersen, Ole Oiseth, Eliz-Mari Lourens
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2019)
