Article
Construction & Building Technology
Ross A. Mcadam, Manolis N. Chatzis, Muge Kuleli, Emily F. Anderson, Byron W. Byrne
Summary: This paper presents a structural health monitoring approach that combines output only structural health monitoring methods and model updating to estimate foundation stiffness parameters. Field monitoring data from an offshore wind turbine under idling conditions are used to estimate modal parameters and compare them with predictions from finite element models. A new approach for interpreting seabed level statically equivalent foundation stiffness is also presented. The results demonstrate a close match to the predictions of the PISA method.
STRUCTURAL CONTROL & HEALTH MONITORING
(2023)
Article
Engineering, Civil
Andrija Buljac, Hrvoje Kozmar, Wenxian Yang, Ahsan Kareem
Summary: This study focuses on addressing the issue of environmental load effects on offshore wind turbines subjected to wind, wave, and currents. Laboratory experiments using a scaled model of an offshore wind turbine are conducted in the Wind-Wave-Current Tank at Newcastle University, UK. The surge force exerted by currents contributes significantly to the overall average loads, while waves are the main source of unsteady loads. The dynamic loads on offshore wind turbines are primarily at the wave frequency when waves are present. The response is more pronounced when all three load components act concurrently.
ENGINEERING STRUCTURES
(2022)
Article
Green & Sustainable Science & Technology
Ming Song, Zhiyu Jiang, Wei Yuan
Summary: This study evaluates the dynamic responses of a monopile-supported wind turbine under ship impacts in the vicinity of offshore wind turbines. Both numerical and analytical methods were used to assess the impact mechanism, considering factors such as wind load effects, soil conditions, and ship characteristics. The engineering approaches developed in this study can be applied to address accidental collision problems between ships and bottom-fixed offshore wind turbines.
Article
Engineering, Marine
Wystan Carswell, Sanjay R. R. Arwade, Jorgen Johansson, Don J. J. DeGroot
Summary: This paper investigates the influence of foundation damping on the cyclic load demand of offshore wind turbines and proposes a method to calculate the foundation damping. The results show that considering foundation damping in time history analysis can significantly reduce the cyclic foundation moment demand, particularly during parked and emergency shutdown conditions.
Article
Environmental Sciences
Navid Majdi Nasab, Jeff Kilby, Leila Bakhtiaryfard
Summary: This paper determines the optimal dimensions of monopiles to support the integrated assembly through finite element analysis and macro-element model, providing technical support for the integration of offshore wind and tidal energy.
Review
Engineering, Ocean
Fengpeng Zhang, Xuguang Chen, Jiahao Yan, Xingzheng Gao
Summary: This paper provides a comprehensive review of the latest advancements in preventing scouring for offshore wind turbine monopile foundations. It categorizes scour countermeasures into three groups and provides a detailed overview of more than twenty measures. Furthermore, a comprehensive comparison and evaluation of these measures have been conducted, analyzing the strengths and weaknesses of each.
APPLIED OCEAN RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Bo Qin, Yanfeng Xie, Wenxian Yang, Rui Qu, Fei Geng
Summary: This paper conducts experimental studies to investigate the effect of monopile vibration, water flow, and intermittent operation of OWTs on the scour around the monopile foundation. The results show that monopile vibration can create 'scour pits' and cause soil densification even in the absence of water flow. The coupling of large-amplitude monopile vibration and water flow exacerbates the scour, while the coupling of small-amplitude monopile vibration and water flow retards the scour. Vibration amplitude has a greater influence on the scour than vibration frequency.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Engineering, Civil
Dongyue Tang, Ming Zhao
Summary: This study established a real-time safety monitoring system for scouring around a monopile foundation based on the Jiangsu Rudong Offshore Wind Farm Demonstration Project, improving detection efficiency and accuracy through numerical models and warning indicators.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2021)
Article
Engineering, Marine
Jiale Li, Yong Zhang, Xuefei Wang, Zizheng Sun
Summary: This study introduces a new type of monopile foundation design with internal restriction plates to enhance the bearing capacity of the structure. Experimental tests in saturated sand show that the improved piles provide larger lateral resistances compared to traditional piles, with the improvement proportional to pile diameter. The research also suggests that the four-hole restriction plate is more effective for larger diameter piles.
Article
Computer Science, Interdisciplinary Applications
Zhiwei Gao, Luoyi Yan, Scott Whyte
Summary: Long-term cyclic loading can cause excessive permanent rotation of offshore wind turbines due to sand's ratcheting response. A hybrid strain accumulation approach, called the bounding surface stiffness degradation method (B-SDM), is presented for the finite element analysis-based design of OWTs under cyclic loading. This approach incorporates a base elastoplastic constitutive model and a cyclic strain accumulation scheme, allowing for a versatile overlay scheme applied to various base elastoplastic models.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Marine
Xiaoyang Cheng, Andrea Diambra, Erdin Ibraim, Haoyuan Liu, Federico Pisano
Summary: This paper utilizes advanced 3D finite element modelling and laboratory testing to analyze the stress paths experienced by soil elements near a monopile foundation. It emphasizes the importance of considering the cyclic rotation of principal stress axes when investigating the response of soil elements under stress conditions similar to those around a monopile foundation.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Civil
Sangeet Kumar Patra, Sumanta Haldar
Summary: This study investigates the seismic response of monopile supported offshore wind turbines in liquefiable sand deposits under combined operational and seismic loads. Various seismic motion records are scaled and applied to study the effect of earthquake intensity and liquefaction depth on the dynamic response of the structure. Design implications for offshore wind turbines in liquefiable soil are also suggested.
Article
Engineering, Civil
Giuseppe Campione
Summary: The objective of this study was to determine the structural response of wind towers with monopile foundations made of steel tube with hollow cross-sections, taking into account the soil-structure interaction. Elastic and plastic analyses were conducted to determine the moment-rotation curves of the soil-foundation complex for the verification of ultimate and operating limit states. The influence of foundation characteristics and soil type on the first frequency and critical length was considered in the calculation.
Article
Green & Sustainable Science & Technology
Xiang Zhao, My Ha Dao, Quang Tuyen Le
Summary: In the wind energy industry, a cost-benefit digital twin (DT) is highly valuable for managing the operation of wind turbines. This study utilizes a component-based Reduced-Order Modelling (ROM) technique to create a DT for a parameter-varying offshore wind turbine system. The DT includes a ROM model for modal analysis and prediction of structural response under wind and wave loadings. With significantly faster computation speed and high accuracy, the DT can provide instantaneous predictions of turbine modes, responses, and structural health conditions.
Article
Engineering, Marine
Zechao Zhang, Tianpeng Wang, Zhihai Chen, Jie Zhang
Summary: A reliability analysis framework is proposed to assess the failure probability of monopile foundation, considering the correlated wind and waves, and spatial variability of soil properties. The results suggest that the reliability of monopile foundation may be overestimated if the spatial variability of soil properties is ignored and assuming fully correlated wind and waves.
Article
Mechanics
A. E. Kampitsis, E. J. Sapountzakis
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2017)
Article
Computer Science, Interdisciplinary Applications
A. E. Kampitsis, A. Adam, P. Salinas, C. C. Pain, A. H. Muggeridge, M. D. Jackson
COMPUTATIONAL GEOSCIENCES
(2020)
Article
Construction & Building Technology
Konstantinos A. Kapasakalis, Ioannis A. Antoniadis, Evangelos J. Sapountzakis
STRUCTURAL CONTROL & HEALTH MONITORING
(2020)
Article
Computer Science, Interdisciplinary Applications
Lluis Via-Estrem, Pablo Salinas, Zhihua Xie, Jiansheng Xiang, John-Paul Latham, Steven Douglas, Ioan Nistor, Christopher Pain
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2020)
Article
Engineering, Civil
Konstantinos A. Kapasakalis, Ioannis A. Antoniadis, Evangelos J. Sapountzakis
Summary: This study introduces a new concept of extended KDamper (EKD) as a seismic base absorber, which aims to reduce base relative displacement and base shear in a multi-story building by optimizing parameters and implementing acceleration filtering.
ENGINEERING STRUCTURES
(2021)
Article
Acoustics
Konstantinos A. Kapasakalis, Ioannis A. Antoniadis, Evangelos J. Sapountzakis
Summary: Seismic isolation is an effective technology, with vertical isolation systems facing the challenge of balancing stiffness and flexibility requirements. A novel vertical seismic absorber system combining negative stiffness-driven absorbers with inerters improves dynamic behavior while maintaining static settlements at desired levels.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Mechanics
A. E. Kampitsis, W. J. Kostorz, A. H. Muggeridge, M. D. Jackson
Summary: The study investigates the dynamics, interactions, and decay of immiscible viscous fingers in high-aspect ratio systems in both two and three dimensions. Different behaviors are observed based on viscosity ratio and a macroscopic capillary number. The research reveals that periodic tip-splitting and decay can occur at higher viscosity ratios and lower capillary to viscous ratios, leading to a fluctuation between one and two fingers at late time. Similar behaviors in both two and three dimensions suggest that knowledge from 2D linear displacements can be applied to 3D flows.
Article
Chemistry, Multidisciplinary
Konstantinos A. Kapasakalis, Ioannis A. Antoniadis, Evangelos J. Sapountzakis
Summary: This paper introduces a vibration control system (VCS) as a supplement to conventional base isolation (BI) to increase effective damping and reduce required base displacements. The novel system utilizes a passive negative stiffness-based vibration absorber and is designed for various soil types to consider effectiveness and soil-structure-interaction effects. Comparison with traditional BI suggests that the VCS is an effective alternative and retrofitting option.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Konstantinos A. Kapasakalis, Ioannis A. Antoniadis, Evangelos J. Sapountzakis
Summary: The radically new concept of Stiff Seismic Base Absorber (SBA) proposed in this paper shows great potential for seismic protection of multistory building structures, with significantly reduced base displacements, improved superstructure dynamic behavior, and observed detuning phenomena through sensitivity analysis.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2022)
Article
Engineering, Geological
Marina E. Kalogerakou, Konstantinos A. Kapasakalis, Ioannis A. Antoniadis, Evangelos J. Sapountzakis
Summary: This article proposes a novel vertical Stiff dynamic absorber (SDA) that aims to minimize vertical accelerations induced on the structure and keep the displacement within reasonable limits. The optimized design parameters of the SDA are applicable across a wide range of vertical vibration control applications, achieving great acceleration isolation without compromising the weight-bearing capacity of the structure.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Correction
Mechanics
A. E. Kampitsis, W. J. Kostorz, A. H. Muggeridge, M. D. Jackson
Article
Construction & Building Technology
Antonios G. Mantakas, Konstantinos A. Kapasakalis, Antonios E. Alvertos, Ioannis A. Antoniadis, Evangelos J. Sapountzakis
Summary: In this study, a negative stiffness-based passive vibration absorber called EKD-R is developed and applied as a seismic retrofitting measure for RC residential buildings. The design of the EKD-R device and its properties are optimized using a harmony search algorithm. The effectiveness of the EKD-R system is demonstrated through a realistic case study and nonlinear time-history dynamic analyses.
STRUCTURAL CONTROL & HEALTH MONITORING
(2022)
Article
Engineering, Civil
Renbing An, Jiacong Yuan, Yi Pan, Duhang Yi
Summary: Traditional timber structures built on sloped land are more susceptible to seismic damage compared to structures built on flat land. The upper portion of the structure is found to be the weak point on sloped land, with potential issues such as tenon failure and column foot sliding.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Elyas Bayat, Federica Tubino
Summary: The current design guidelines for assessing floor vibration performance do not consider the influence of variability in the walking path on the dynamic response of floors. This study investigates the dynamic response of floors under a single pedestrian walking load, taking into account the randomness of the walking path and load. The effectiveness of the current guidelines in predicting floor response is critically assessed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Gao Ma, Chunxu Hou, Hyeon-Jong Hwang, Linghui Chen, Zhenhao Zhang
Summary: Minimizing earthquake damage and improving repair efficiency are the main principles of resilient structures. This study proposed a repairable column with UHPC segments and replaceable energy dissipaters. The test results showed that the columns with UHPC segments and replaceable dissipaters exhibited high strength, deformation capacity, and energy dissipation.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Kartheek S. M. Sonti, Pavan Kumar Penumakala, Suresh Kumar Reddy Narala, S. Vincent
Summary: In this study, the compressive behavior of alumina hollow particles reinforced aluminum matrix syntactic foams (AMSF) was investigated using analytical, numerical, and experimental methods. The results showed that the FE solver ABAQUS could accurately predict the elastic and elastio-plastic behavior of AMSFs. The study also suggested that FE models have great potential in developing new materials and composites under compression loading.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Zheqi Peng, Xin Wang, Zhishen Wu
Summary: In this study, the statistical modeling of fiber-reinforced polymer (FRP) cables using the classic fiber bundle model is explored. The study considers important features of large-scale multi-tendon FRP cables, such as initial random slack and uneven tensile deformation among tendons. A parametric study and reliability analysis are conducted to predict the load-displacement relation and design thousand-meter-scale FRP cables. The study emphasizes the relation between the reliability index beta of the cable and the safety factor gamma of the FRP material.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Yanchao Shi, Shaozeng Liu, Ye Hu, Zhong-Xian Li, Yang Ding
Summary: This paper introduces a damage assessment method for reinforced concrete (RC) columns under blast loading, using modal parameter measurement as the evaluation index. The validity of the proposed method is validated through numerical and experimental analysis. The results show that this modal-based damage assessment method is applicable for non-destructive evaluation of blast-induced damage of RC columns.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Xiaolin Zou, Maosheng Gong, Zhanxuan Zuo, Qifang Liu
Summary: This paper proposes an efficient framework for assessing the collapse capacity of structures in earthquake engineering. The framework is based on an accurate equivalent single-degree-of-freedom (ESDOF) system, calibrated by a meta-heuristic optimization method. The proposed framework has been validated through case studies, confirming its accuracy and efficiency.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jie Hu, Weiping Wen, Chenyu Zhang, Changhai Zhai, Shunshun Pei, Zhenghui Wang
Summary: A deep learning-based rapid peak seismic response prediction model is proposed for the most common two-story and three-span subway stations. The model predicts the peak seismic responses of subway stations using a data-driven approach and limited information, achieving good predictive performance and generalization ability, and demonstrating significantly higher computational efficiency compared to numerical simulation methods.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jin Ho Lee, Jeong-Rae Cho
Summary: A simplified model is proposed to estimate the earthquake responses of a rectangular liquid storage tank considering the fluid-structure interactions. The complex three-dimensional structural behavior of the tank is represented by a combination of fundamental modes of a rectangular-ring-shaped frame structure and a cantilever beam. The system's governing equation is derived, and earthquake responses such as deflection, hydrodynamic pressure, base shear, and overturning moment are obtained from the solution.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
W. J. Lewis, J. M. Russell, T. Q. Li
Summary: The work discusses the key features and advantages of optimal 2-pin arches shaped by statistically prevalent load and constant axial stress. It extends the design space of symmetric arches to cover asymmetric forms and provides minimum values of constant stress for form-finding of such arches made of different materials. The analysis shows that constant stress arches exhibit minimal stress response and have potential implications for sustainability and durability of future infrastructure.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Wen-ming Zhang, Han-xu Zou, Jia-qi Chang, Tian-cheng Liu
Summary: Saddle position is crucial in the construction and control of suspension bridges. This study proposes an analytical approach to estimate the saddle positions in the completed bridge state and discusses the calculation under different definitions. The relationship between the saddle position and the tower's centerline is analyzed, along with the eccentric compression of the tower. The feasibility of the proposed method is verified through a real-life suspension bridge.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Shaise K. John, Alessio Cascardi, Yashida Nadir
Summary: This study experimentally investigated the use of TRM material for reinforcing concrete columns. The results showed that increasing the number of textile layers effectively increased the axial strength. Additionally, the choice of fiber type and hybrid textile configuration also had a significant impact on strength improvement. A new design model that considers the effects of both the confining matrix and textile was proposed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chandrashekhar Lakavath, S. Suriya Prakash
Summary: This study experimentally investigated the shear behavior of post-tensioned UHPFRC girders, considering factors such as prestress level, fiber volume fraction, and types of steel fibers. The results showed that increasing prestress and fiber dosage could enhance the ultimate load-carrying capacity of the girders, reduce crack angle, and increase shear cracking load.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Vahid Goodarzimehr, Siamak Talatahari, Saeed Shojaee, Amir H. Gandomi
Summary: In this paper, an Improved Marine Predators Algorithm (IMPA) is proposed for size and shape optimization of truss structures subject to natural frequency constraints. The results indicate that IMPA performs better in solving these nonlinear structural optimization problems compared to other state-of-the-art algorithms.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chun-Xu Qu, Jin-Zhao Jiang, Ting-Hua Yi, Hong-Nan Li
Summary: In this paper, a computer vision-based method is proposed to monitor the deformation and displacement of building structures by obtaining 3D coordinates of surface feature points. The method can acquire a large number of 3D coordinates in a noncontact form, improve the flexibility and density of measurement point layout, and is simple and cost-effective to operate.
ENGINEERING STRUCTURES
(2024)