Article
Engineering, Civil
Yanru Wu, Xiaohong Wu, Junxin Li, Haohui Xin, Qing Sun, Jiantao Wang
Summary: This study focuses on the vortex-induced vibrations of cable-stayed bridges without backstays, showing different types of vibrations under various wind speeds. The responses of the bridge deck to vortex-induced vibrations change under the influence of wind flow, especially at positive wind angles of attack.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Elena Lopez-Nunez, Mikel Ogueta-Gutierrez, Omar Gomez-Ortega, Raul Manzanares-Bercial, Elena Roibas-Millan, Sebastian Franchini
Summary: To increase the capacity of a simple bridge, lateral extension decks are added to the main deck. An experimental wind tunnel campaign was conducted to analyze the aeroelastic behavior of a hinged-deck cross-section cable-stayed bridge. The experimental model used a reduced 6 degrees of freedom (DOFs) model to study the bridge's oscillating motion.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Shouying Li, Haokun Jing, Yangchen Deng, Dongsheng He, Zhengqing Chen
Summary: Recent years have witnessed harmful vortex-induced vibrations of high-order modes of super long stay cables on cable-stayed bridges with main spans close to 1000 m. To investigate the possibility of high-mode vortex-induced vibrations of the no-hanger main cable of a side span in a cable-stayed suspension bridge, wind tunnel tests were conducted using a three-dimensional elastic test model. The tests revealed large-amplitude oscillations of the test model under wind angles of 0°, ±50°, and +60°, with the highest observed mode being the 16th order. The results also showed that the high-order vortex-induced vibration of the cable can be effectively mitigated by increasing damping ratios or using helical wire with a pitch of 12D.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2023)
Review
Engineering, Multidisciplinary
Lixiao Zhang, Guoyang Qiu, Zhishou Chen
Summary: Cables are crucial components in cable-stayed bridges, and monitoring their tension is essential for ensuring bridge safety. This paper examines both traditional and innovative methods for monitoring cable force, including recent advancements in intelligent monitoring techniques. The conclusion provides insight for the future development of cable-stayed bridges.
Article
Chemistry, Multidisciplinary
Jaegyun Park, Jaeyong Yoon, Chulho Park, Jungwhee Lee
Summary: As the demand and construction of cable-stayed bridges have increased, research on the safety of cable-stayed bridges in the event of natural disasters such as fires and explosions is actively being conducted. This study evaluates the usability of the cable-stayed bridge in the event of cable damage and assesses its seismic performance and the impact of the damage through numerical analysis.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Guohui Zhao, Zhichao Wang, Shuo Zhu, Jianming Hao, Jun Wang
Summary: This paper investigates the aerodynamic response features of an asymmetric cable-stayed bridge by analyzing its dynamic characteristics and studying VIV and flutter response at various wind fairing angles. The results highlight the important effect of structural asymmetry and fairing shape on wind-induced bridge vibration and can facilitate more appropriate wind design of asymmetric cable-stayed bridges.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Yanxiao Yang, Mubiao Su, Heng Liu
Summary: In the study, the effects of ambient temperature change, stiffness degradation of the main beam, and cable damage on the deflection of the main girder in a single-tower cable-stayed bridge under self-weight were investigated. The results showed that the deflection difference of the girder had obvious characteristics before and after cable damage, with a twisted distribution curve and increasing peak value. The deterioration of the girder's performance made the deflection more sensitive to cable damage. Ambient temperature change had a significant influence on the girder's deflection, but no obvious influence on the deflection difference before and after cable damage.
Article
Engineering, Civil
Hourui Duan, Hongbo Liu, Yue Sun, Hongshuai Gao
Summary: Based on the analysis of the engineering background of the cable-stayed bridge without backstays in Jinzhou Bridge, it is found that the current cable force fails to satisfy the actual requirements. Finite element models are established and modified to analyze the internal force states of the beam and tower, and determine the reasonable internal force state and corresponding cable forces.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2023)
Article
Construction & Building Technology
Xiaoling Liu, Xiyan Yi, Bing Wang, Ying Liu
Summary: A novel method for assessing grouped cable forces using deflection data is proposed in this article, which includes establishing a simplified equation between cable forces and girder deflection, determining the threshold value of cable force change rate, and developing a condition assessment method for grouped cable forces. A case study of a real bridge validates the proposed theoretical equation and shows a decrease in the assessment scores of grouped cables over six years, reflecting the development of other component defects.
Article
Engineering, Civil
Cong Zeng, Hui Jiang, Xiaoyu Bai, Guangsong Song
Summary: This study focuses on developing a multi-criteria optimizing method and investigating the damping effect of the optimized damper system on a cable-stayed bridge across a strike-slip fault. The influence of fault-crossing angles and earthquake parameters on the damping effect of the optimized damper system are investigated. The results indicate that fault-crossing angles and earthquake parameters have considerable influence on the damping effects.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Houjun Kang, Xiaoyang Su, Zihao Pi
Summary: The study explores the dynamic characteristics of a multi-cable-stayed shallow-arch model of a cable-stayed bridge under internal resonance, finding that support stiffness can reduce response amplitudes by absorbing energy to some extent.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Geological
Dionysius M. Siringoringo, Yozo Fujino
Summary: This paper investigates the seismic response characteristics and modal parameters of a cable-stayed bridge with movable bearings using vibration records obtained from a seismic monitoring system. It reveals that friction force at the movable bearings is the main source of the large damping, affecting the bridge's dynamic characteristics differently at various excitation levels, but stabilizing after a certain level of excitation.
BULLETIN OF EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Civil
Mohammad E. Omran, Abbas H. Karani
Summary: This paper studies the performance of isolated cable-stayed bridges in case of cable loss conditions, focusing on the Bill Emerson Cable-Stayed Bridge with Roll-N-Cage (RNC) isolators. The results show that the RNC isolator with an activated buffer mechanism can effectively reduce the permanent displacement under seismic loads and provide structural stability.
Article
Engineering, Civil
Noel Soto, Clara Cid, Aitor Baldomir, Santiago Hernandez
Summary: This paper presents a methodology to optimize the cable system in cable-stayed bridges by considering the accidental breakage of one cable. A multi-model optimization strategy is proposed, and design constraints are established on both the intact and damaged models. Impact loads are applied in the damaged models to account for the dynamic effect of cable breakage. The objective is to minimize the steel volume by varying cable anchor positions, number of cables, cross-sectional areas, and prestressing forces. The approach is applied to the Queensferry Crossing Bridge, resulting in a different layout with increased cables and smaller areas, while minimizing the penalty in steel volume.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
Shuang Zhao, Yi Shi, Jiahao Chen, Zhitao Yan, Bin Zhang, Xueqin Zhang, Zhenqiang Wang
Summary: Existing research has shown that curved beam unilateral stayed bridges (CBUSB) are at risk of cable breakage under design wind velocity. In order to ensure the structural wind-induced vibration security, it is necessary to study the wind-induced vibration characteristics of CBUSBs considering the impact load caused by cable breakage. Parametric analyses were conducted to assess the influence of cable breakage on the wind-induced vibration response of CBUSBs. The proposed dynamic amplification factor (DAF) can consider the amplification effect of wind-induced vibration due to cable breakage.
Article
Engineering, Civil
Jaeyeong Lim, Sunjoong Kim, Ho-Kyung Kim
Summary: This study presents an automatic classification method for vortex-induced vibrations (VIVs) in long-span bridges using machine learning algorithms. A three-stage strategy, including semi-supervised labeling, deep neural network training, and determination of the optimum parameter range, is proposed. The method demonstrates consistent and accurate detection of VIVs, as illustrated by its application to a cable-stayed bridge based on actual monitoring data.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Engineering, Civil
Jae-Yeong Lim, Sejin Kim, Ho-Kyung Kim, Young-Kuk Kim
Summary: A framework for short-term wind speed prediction in bridge traffic control under strong winds is proposed, aiming to improve prediction accuracy. The framework incorporates hybrid modeling and a time-shifted data correction method.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Chemistry, Analytical
Geonhee Lee, Sunjoong Kim, Sangsub Ahn, Ho-Kyung Kim, Hyungchul Yoon
Summary: This study introduces a new vision-based cable displacement measurement system that can measure the displacement of a cable even when the camera is installed in the side of the cable. The proposed method was validated through simulation-based tests, lab-scale tests, and on-site tests.
Article
Engineering, Civil
Sunjoong Kim, Ho-Kyung Kim, Billie F. Spencer
Summary: This study proposes a machine-learning-based fault-data management approach to accurately estimate damping values by identifying and removing sensor faults in long-term monitored data of large-scale structures. The method uses a support Vector Machine (SVM) and a new feature to classify faulty and normal data, and augments training samples using digital simulation. The effectiveness of the approach is validated using data from a wireless sensor network in a cable-stayed bridge.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2022)
Article
Acoustics
Sunjoong Kim, Sejin Kim, Ho-Kyung Kim
Summary: This case study investigates the cause of high-mode vortex-induced vibration (VIV) in stay cables of a cable-stayed bridge using long-term field monitoring data. Wind characteristics and dynamic responses of girders and stay cables were analyzed to study two potential vibration sources - interactions with girders and vortex shedding. A novel modal decomposition procedure and damping identification technique were proposed to reveal the relationship between shedding frequencies of stay cables, critical wind velocities, and the damping capacity's effect on modal VIV amplitudes. The effectiveness of Stockbridge dampers in mitigating high-mode cable VIVs was examined through field application and comparison analysis during a typhoon. The unique interaction between stay cable vibrations and the buffeting response of bridge girders was also discussed.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Construction & Building Technology
Geonyeol Jeon, Sunjoong Kim, Sangsub Ahn, Ho-kyung Kim, Hyungchul Yoon
Summary: Cables are crucial structural components of cable-stayed bridges, but their vibrations caused by wind and vehicles can greatly affect the bridges' usability. To overcome the challenges of installing sensors for measuring cable vibrations, researchers have introduced a computer-vision-based displacement method. However, manual selection of the region of interest (ROI) and loss of feature points remain issues in this method. This paper proposes a new method that automatically selects the ROI using a convolutional neural network and tracks feature points more robustly using a modified Kanade-Lucas-Tomasi (KLT) algorithm.
STRUCTURAL CONTROL & HEALTH MONITORING
(2022)
Article
Construction & Building Technology
Youchan Hwang, Jae-Hong Shim, Oh-Sung Kwon, Ho-Kyung Kim
Summary: The conventional spring-supported section model test is effective but has limitations in selecting the model scale and requires calibration and modification of dynamic properties. This study proposes a new real-time aeroelastic hybrid simulation approach that directly measures the aeroelastic force on the physical model, eliminating the potential drawbacks of the conventional approach.
JOURNAL OF STRUCTURAL ENGINEERING
(2023)
Article
Engineering, Civil
Doyun Hwang, Sunjoong Kim, Ho-Kyung Kim
Summary: Modal parameters play a critical role in wind resistant design and vibrational serviceability assessments of cable-supported bridges. However, modeling damping ratio remains challenging due to inherent errors in damping estimates, lack of insight into damping mechanisms, and uncertainties in environmental and operational conditions. This paper proposes a probabilistic regression model using Deep Gaussian Processes (DGP) to estimate damping based on 2.5 years of structural health monitoring data from a cable-stayed bridge. The model incorporates input features representing environmental and operational conditions that are hypothesized to be related to damping ratios. Comparative studies confirm the robustness of DGPs in different datasets, and a feature engineering process identifies the most significant predictor of damping ratios. This data-driven regression model enables a probabilistic consideration of damping in structural design and vibrational serviceability assessments.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2023)
Article
Engineering, Civil
Sunjoong Kim, Soyeon Park, Jinwon Shin, In-Rak Choi, Sungmo Choi
Summary: This study proposes a framework using long-short-term memory (LSTM) with Bayesian optimization to reconstruct temperature histories in fire experiments by learning the spatiotemporal correlation of the data. The framework is validated using simulated datasets and real fire test results, demonstrating its reliability and practicality. A novel data processing technique is also introduced to mitigate overfitting issues, enhancing the robustness and reliability of temperature history reconstruction. Overall, the results highlight the potential of deep learning in accurately and practically reconstructing temperature histories in fire experiments.
FIRE SAFETY JOURNAL
(2023)
Article
Engineering, Multidisciplinary
Taeyong Kim, Marco Aulla Villacres, Jaehong Shim, Oh-Sung Kwon, Ho-Kyung Kim
Summary: Load cells, used for measuring forces and torques, often need to take into account the inertia of the object being measured. This study proposes a differential load cell that addresses the coupling effect of inertia by combining two load cells with a novel Wheatstone bridge design.
Article
Engineering, Civil
Qingshan Yang, Juan Wang, Sunjoong Kim, Huihui Chen, Billie F. Spencer
Summary: This paper reports the design and implementation of a long-term Structural Health Monitoring (SHM) system on the Feiyun Wooden Pavilion in China, a historic timber building. The system utilizes 104 sensors of 6 different types to monitor environmental effects and structural responses. Through data processing and analysis, the system has shown the capability of assessing the condition of the structure based on one year of monitoring data.
SMART STRUCTURES AND SYSTEMS
(2022)
