Article
Engineering, Biomedical
Giuseppe Coviello, Antonello Florio, Gianfranco Avitabile, Claudio Talarico, Janet M. Wang-Roveda
Summary: In modern medicine, smart wireless connected devices are playing an increasingly important role in monitoring patients' health and aiding doctors' work. However, synchronization in multi-board wireless connected systems has always been a challenging issue. This paper presents a distributed full synchronized system for monitoring patients' health, with time synchronization ensured by the Fractional Low-power Synchronization Algorithm (FLSA).
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
(2022)
Article
Computer Science, Interdisciplinary Applications
Bartosz Sobczyk, Lukasz Pyrzowski, Mikolaj Miskiewicz
Summary: This paper describes the problems encountered during the analysis of the structural response of historic masonry railroad arch bridges. It focuses on the stiffness of the masonry arches, their strengths, and the estimation of railroad load intensity. The paper presents computational models created to efficiently describe the responses of the bridges under typical loading conditions and discusses the outcomes of nonlinear static analyses. The possible causes of the deterioration of the bridges' condition were identified through these analyses.
COMPUTERS & STRUCTURES
(2024)
Article
Chemistry, Analytical
Lei Xing, Wujiao Dai, Yunsheng Zhang
Summary: This study presents a multi-point displacement measurement method for bridges using a low-cost Scheimpflug camera, which effectively reduces motion errors and maintains high consistency with LiDAR-based measurements through techniques such as motion compensation.
Article
Engineering, Civil
Yaozhi Luo, Yi Chen, Hua-Ping Wan, Feng Yu, Yanbin Shen
Summary: A laser-based displacement monitoring system was developed to track the real-time deformation of large-scale spatial structures, which showed good agreement with the finite element model-derived counterparts, indicating the effectiveness of the system.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2021)
Article
Chemistry, Multidisciplinary
Gun Park, Jae Hyuk Lee, Hyungchul Yoon
Summary: Current maintenance practices are time-consuming and costly, necessitating the need for a new maintenance technique. Building information modeling (BIM) has been applied to systematic planning and design in construction, but its application to existing structures is limited. This study proposes a method using photographic data and unmanned aerial vehicles to automatically construct 3D models, potentially improving current maintenance procedures.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Biao Hu, Wenjun Chen, Yueqiang Zhang, Yihe Yin, Qifeng Yu, Xiaolin Liu, Xiaohua Ding
Summary: A new vision-based multi-point displacement monitoring system is proposed for large-span bridges, utilizing a camera network to accurately monitor dynamic deflection and lateral displacement. The feasibility of the vision method for bridge monitoring has greatly improved, providing a new method and fine parameters for safety evaluation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Chemistry, Analytical
Zeyu Yue, Haili Sun, Ruofei Zhong, Liming Du
Summary: The study proposes a method for calculating shield tunnel displacements, utilizing point cloud data from a mobile tunnel deformation detection system to generate orthophoto images. By combining gray gradients, the Canny algorithm, and the Hough line detection algorithm, longitudinal and transverse seams are identified, and circumferential and radial displacements are calculated through the symmetrical vertical foot method and cross-section superposition analysis. The proposed method achieves automatic recognition and fast, accurate tunnel displacement monitoring.
Article
Engineering, Multidisciplinary
Shengli Li, Zhenzhen Liang, Pan Guo
Summary: This paper proposes a fiber Bragg grating pull-wire vertical displacement sensor for long-term monitoring of medium-small span bridges. It has advantages of low cost, high accuracy, and easy installation. Experimental results demonstrate its feasibility and high measuring accuracy for vertical displacement measurement.
Article
Construction & Building Technology
Wei-Hua Hu, Zeng-Mao Xu, Xiao-Han Bian, De-Hui Tang, Wei Lu, Chao Li, Jun Teng, Alvaro Cunha
Summary: This paper reports the structural dynamic behaviors of a skyscraper under operational conditions using a wireless distributed synchronized data acquisition system. The system is developed to conveniently acquire the structural responses from the skyscraper with the GNSS time information. The synchronization accuracy of the system is validated by comparing the modal parameters estimated by wired central data acquisition and the wireless system. The dynamic properties of the skyscraper are presented through operational modal analysis. Additionally, a continuous dynamic monitoring system is developed to capture the long-term structural responses at different spatial positions, and the structural dynamic behaviors of the skyscraper under normal wind, typhoon, and earthquake conditions are reported.
STRUCTURAL CONTROL & HEALTH MONITORING
(2022)
Article
Chemistry, Multidisciplinary
Xiaoya Li, Fangyuan Li
Summary: This paper introduces a monitoring technology solution for short and medium-span bridges, which utilizes wireless laser displacement monitoring technology and equipment to achieve real-time monitoring of bridges. It proves the significant significance of this technology in practical applications.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Analytical
Chuanzhi Dong, Selcuk Bas, Fikret Necati Catbas
Summary: Structural displacement monitoring is a significant challenge for large-scale civil structures, and computer vision-based monitoring has gained traction. This paper demonstrates the successful application of computer vision-based monitoring on three landmark long-span suspension bridges in Turkey. The results align well with conventional techniques and finite element analysis, but challenges such as adverse environmental factors and algorithm selection are highlighted.
Article
Chemistry, Multidisciplinary
Xi Chu, Zhixiang Zhou, Weizhu Zhu, Xin Duan
Summary: Bridge displacement is important for safety evaluations. A multi-point displacement synchronous monitoring method using natural texture features of the structural surface as measurement points is proposed. The method eliminates displacement mismatches by using the structural deflection curve and achieves a maximum error of 8.70% compared to 3D laser scanning measurement method.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Civil
Fernando Moreu, Lingkun Chen, Can Zhu, Zeyu Wu, Xinxing Yuan
Summary: Researchers have developed a new sensing technology (reference-free) to estimate displacements of railroad bridges. Using a 2 degrees of freedom (2DOF) solution, the method provides more accurate displacement estimation compared to the traditional 1 degree of freedom (1DOF) model. This approach enables cost-effective condition-based information related to bridge safety.
JOURNAL OF INFRASTRUCTURE SYSTEMS
(2023)
Article
Engineering, Civil
Hoang Minh Ngo Le, Keita Hashimoto, Minh Tuan Ha, Shota Kita, Saiji Fukada, Toshiyuki Ueno
Summary: This study conducted a structural health assessment for an elevated line on the Hokuriku Expressway, confirming that chloride attack was the main cause of deterioration. The reduction in stiffness and load-bearing capacity due to chloride attack was also studied, and a steel corrosion mitigation method using a detachable sacrificial anode was applied. In addition, a self-powered remote-monitoring system using a vibration energy harvester was introduced.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2023)
Article
Chemistry, Analytical
Jongbin Won, Jong-Woong Park, Junyoung Park, Junsik Shin, Minyong Park
Summary: This study proposes a reference-free indirect bridge displacement sensing system for measuring structural displacement, which shows promising results in experimental evaluation.
Article
Engineering, Civil
Baitao Sun, Billie F. Spencer, Peilei Yan, Xiangzhao Chen, Guixin Zhang
Summary: This study analyzes the seismic characteristics and damage causes of buildings with different structures in the area affected by the Lushan earthquake in China. It assesses the vulnerability of various structural forms in different intensity regions and compares the vulnerabilities of similar buildings. The research results provide important references for earthquake engineers in recognizing failure modes, revising design codes, and formulating disaster-reduction plans.
JOURNAL OF EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Civil
Nani Bai, Hui Li, Junming Ma, Chengming Lan, Billie F. Spencer
Summary: This article investigates the quantitative influences of corrosion on the fatigue life of high-strength steel wires. A multiparameter Weibull model is proposed to analyze the corrosion-stress-life relationship, and the Goodman relation is used to account for the dependence of stress ranges on positive stress ratios. The results show that corrosion significantly decreases the fatigue life of steel wires, especially at lower stress ranges, and the influence of ultimate tensile strengths on fatigue life can be ignored.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Transportation Science & Technology
Sarah Tell, Andreas Andersson, Amirali Najafi, Bill F. Spencer, Raid Karoumi
Summary: The dynamic response of railway bridges is critical due to the risk of resonance from high velocity loading. Using magnetorheological dampers can control the structure's response, and real-time hybrid simulations have shown that bridge responses can be reduced to permissible levels.
INTERNATIONAL JOURNAL OF RAIL TRANSPORTATION
(2022)
Article
Engineering, Civil
Huaibing Xu, Nani Bai, Chengming Lan, Hui Li, Billie F. Spencer
Summary: This study quantitatively assessed the influence of corrosion and its variability on the fatigue life of stay cables. The study proposed the corrosion-life inverse equal rank assumption to identify the order of wire failures. The study found that as the variability in corrosion of the wires increases, the variability in the fatigue life of the stay cables increases as well, resulting in a decrease in the fatigue life. The study also found that the decrease in fatigue life is more pronounced with higher corrosion levels and larger corrosion variability.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Engineering, Civil
Brian A. Eick, Nathaniel M. Levine, Matthew D. Smith, Billie F. Spencer
Summary: Locks and dams play a crucial role in transporting billions of dollars worth of goods through inland waterways each year. However, the anchorages that support the lock components have been subjected to cyclic loads for over 80 years and there are concerns about fatigue failure. The traditional analysis approach ignores the effect of concrete and suggests the need for costly replacements. However, numerical modelling and laboratory testing show that the planned replacements may not be necessary.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Construction & Building Technology
Qingxin Zhu, Hao Wang, B. F. Spencer, Jianxiao Mao
Summary: Temperature-induced responses to changes in bridge properties are sensitive, and temperature-response mappings are difficult to obtain analytically. Researchers have developed mappings using measured data, but capturing spatial temperature distribution within a bridge presents challenges, particularly for steel truss bridges with numerous structural members. This paper proposes using the relationship between temperature and responses to assess bridge performance, with promising results for identifying abnormal behavior. This approach can be improved by using all temperature sensors and principal component analysis to reduce input dimensions.
JOURNAL OF STRUCTURAL ENGINEERING
(2022)
Article
Construction & Building Technology
Sungsik Yoon, Billie F. Spencer, Sangmok Lee, Hyung-Jo Jung, In-Ho Kim
Summary: This study proposes a method to assess the seismic performance of deteriorated bridges using UAV-based damage detection. The method consists of two phases: damage detection using UAV and seismic performance assessment. The results show that the seismic responses of the deteriorated bridge are 10% poorer than those of the intact bridge.
STRUCTURAL CONTROL & HEALTH MONITORING
(2022)
Article
Engineering, Civil
Qingxin Zhu, Hao Wang, Billie F. Spencer
Summary: Temperature-induced bridge responses can be used as an indicator of bridge health, but its relationship with temperature and temperature-induced displacement is influenced by bridge bearing properties and spatial temperature distributions. This study focuses on accurately mapping temperature-induced responses in long-span steel truss arch bridges, considering bearing properties and spatial temperature distributions.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2022)
Article
Engineering, Civil
Lei Zhang, Baitao Sun, Zhijun Jiang, B. F. Spencer
Summary: This paper proposes a novel method for evaluating seismic damaged buildings based on 65 RC buildings, and the results indicate the feasibility of this method for assessing the safety of damaged buildings on site.
JOURNAL OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Civil
Xuguang Wang, Cristoforo Demartino, Yasutaka Narazaki, Giorgio Monti, Billie F. Spencer Jr
Summary: This paper proposes a framework for rapid seismic risk assessment of bridges using aerial photogrammetric surveys conducted by Unmanned Aerial Vehicles (UAVs). The data acquisition process for the photogrammetric 3D reconstruction of an asset and the subsequent procedure for computer-vision-based automatic extraction of visible geometric features are presented. The framework combines extracted features in the structural models to perform a seismic risk assessment in terms of capacity-to-demand ratios.
ENGINEERING STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Nathaniel Levine, Thomas Golecki, Fernando Gomez, Brian Eick, Billie F. Spencer
Summary: Accurate assessment of remaining life of infrastructure assets, especially inland navigation infrastructure, is crucial for safe operation and efficient maintenance. The embedded steel anchorages on miter gates, identified as critical components, often reach the end of their useful life. Traditional analysis method neglects the concrete embedment, resulting in conservative estimates of remaining fatigue life. This work proposes Bayesian model updating to calibrate concrete embedment and obtain more accurate assessments of remaining life for other embedded anchorages.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Computer Science, Interdisciplinary Applications
Thomas Golecki, Fernando Gomez, Juan Carrion, Billie F. Spencer Jr
Summary: This paper proposes a topology optimization method for high-speed rail bridges that considers passenger comfort through accounting for the vehicle-bridge interaction effects.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Engineering, Civil
Shaik Althaf Shajihan, Shuo Wang, Guanghao Zhai, Billie F. Spencer
Summary: Data-driven structural health monitoring of civil infrastructure allows continuous assessment of structure condition and preemptive safety measures. However, malfunctioning sensors can disrupt the assessment and lead to false-negative damage indications. This paper proposes an automated approach to detect and classify anomalies by enriching the neural network input data features. The method achieves high overall accuracy and recall in detecting faults in a long-span bridge's sensor dataset.
SMART STRUCTURES AND SYSTEMS
(2022)