Article
Thermodynamics
Hanwen Ju, Wenqiang Zhai, Yang Deng, Min Chen, Aiqun Li
Summary: In structural health monitoring, the temperature time-lag effect can affect the assessment and warning of structure. Existing studies mainly focus on using machine learning models to eliminate this effect, but the training is expensive. This study proposes a novel time-domain translation (TDT) method that reduces the mean square error (MSE) between the original structural deformation data and fitting data to eliminate temperature time-lag effect. The proposed method effectively reduces hysteresis loops and enhances the correlation between bridge structure deformation and temperature data.
CASE STUDIES IN THERMAL 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
Environmental Sciences
Daniel Tonelli, Valeria F. Caspani, Andrea Valentini, Alfredo Rocca, Riccardo Torboli, Alfonso Vitti, Daniele Perissin, Daniele Zonta
Summary: This paper presents a study on using satellite Interferometric Synthetic Aperture Radar (InSAR) technology to remotely monitor road bridges and interpret the results from a structural standpoint. The study demonstrates the effectiveness of InSAR-based structural health monitoring (SHM) in detecting temperature-induced displacements and identifying different bridge spans. It also reveals unexpected behavior in retrofitted bridge sections and emphasizes the importance of considering environmental factors and geotechnical characteristics in bridge monitoring.
Article
Engineering, Civil
Lingfang Li, Yushi Shan, Qiang Jing, Yu Yan, Zili Xia, Yong Xia
Summary: This study investigates the global 3D temperature behavior of a long-span cable-stayed bridge using field monitoring and unified numerical simulation. Results show that the use of a global 3D model allows for accurate prediction of structural displacements and forces, providing an advantage over conventional 2D or local 3D simulations.
ENGINEERING STRUCTURES
(2023)
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
Zixiang Yue, Youliang Ding, Hanwei Zhao, Zhiwen Wang
Summary: This study uses deep learning to model the mapping relationship between temperature features and temperature-induced deflection of the main girder in a cable stayed bridge. By combining Long Short-term Memory (LSTM) with Convolutional Neural Network (CNN), the improved Stack-LSTM-CNN model is able to detect abnormal deflection based on the residual value between measured and regression values. With high precision, this model shows potential in detecting damaged cables based on bridge geometry.
Article
Construction & Building Technology
Tien-Thang Hong, Jung J. Kim, Duc-Kien Thai, Seung-Eock Kim
Summary: In this study, a graphical automatic system is developed to investigate the stress redistribution of structural members in a steel cable-stayed bridge. The findings show that both the cables and girders are affected by stress relaxation.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Chemistry, Analytical
Namju Byun, Jeonghwa Lee, Joo-Young Won, Young-Jong Kang
Summary: Cable-stayed bridges are commonly used for long-span bridge construction, but their deformation is larger compared to conventional bridges. To evaluate the performance of cable-stayed bridges based on measurement data, monitoring systems have been studied. However, most studies only focused on local response estimation and required sufficient measurement data. Recently, SRALMR was proposed as a method for structural response analysis using a limited amount of multi-response data. In this research, SRALMR was applied to analyze the structural responses of a cable-stayed bridge, estimating the deformed shape and member internal forces using a limited amount of displacement, slope, and strain data. The performance of SRALMR for cable-stayed bridges was analyzed based on the combination and number of response data.
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
Zixiang Yue, Youliang Ding, Hanwei Zhao, Zhiwen Wang
Summary: This paper introduces a digital regression model of temperature-induced deflection for cable-stayed bridges based on an LSTM network. The model improves the output accuracy and stability of the temperature-induced deflection model by considering time dependence and utilizing deep learning techniques.
ENGINEERING STRUCTURES
(2022)
Article
Thermodynamics
Qian Zhang, Xiaopei Cai, Yanrong Zhang, Tao Wang, Yanglong Zhong
Summary: This study aims to analyze the real-time temperature fields and thermal deformations of slab tracks on cable-stayed bridges. By testing, key heat conduction parameters of geotextile and rubber pad were obtained, and the governing equations considering temperature variations were improved. A thermal-fluid-solid coupling model for slab tracks on cable-stayed bridges was proposed. The study found that high temperatures concentrated within 0.05 m depth of the slab, and real-time temperature changes had obvious effects on the irregularity of the rail. In summer, the maximum vertical rail deformation was 201.88 mm and the transverse deformation was 17.87 mm.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Chemistry, Analytical
Dongmei Tan, Tai Guo, Hao Luo, Baifeng Ji, Yu Tao, An Li
Summary: This paper proposes a dynamic early warning method considering the temperature effect for cable-stayed bridges. With the use of GPD extreme value analysis theory and SARIMA model, the monitoring data of a bridge in Wuhan is analyzed and predicted. The comparison with the traditional fixed threshold monitoring system demonstrates that the dynamic threshold has better adaptability and effective monitoring capability for cable-stayed bridges, providing important value for bridge health monitoring.
Article
Construction & Building Technology
Yunwoo Lee, Won-Joo Park, Young-Jong Kang, Seungjun Kim
Summary: Measurement systems using different sensors are well established for the safe use of principal infrastructures, but existing technologies analyzing monitored data are underutilized. This study presents a methodology for monitoring structural response measurement data through pattern changes, which is simple, clear, and easily applicable. The proposed methodology is examined based on the measurement data of an in-service cable-stayed bridge, aiming to relate the pattern of structural responses to the state of the structures for structural health monitoring.
STRUCTURAL CONTROL & HEALTH MONITORING
(2021)
Article
Construction & Building Technology
Yadi Tian, Yang Xu, Dongyu Zhang, Hui Li
Summary: This study proposes global and partial bidirectional long short-term memory (BiLSTM) models to establish a relationship between girder vertical deflection (GVD) and cable tension (CT). The global model shows high accuracy in predicting CT, while the partial model has advantages in training efficiency.
STRUCTURAL CONTROL & HEALTH MONITORING
(2021)
Article
Chemistry, Multidisciplinary
Jintao Shi, Zhijiang Chen
Summary: This article focuses on a single-tower cable-stayed bridge with a steel-UHPC composite deck steel box girder and develops different casting plans for the UHPC layer on the bridge deck. It analyzes the impact of factors such as block casting sequence, post-casting sections, bridge deck counterweights, and their range on the additional deformation and stress during the construction stage. The research explores the effects of these factors on the structural target bridge's completion status under different pouring schemes. The study suggests that using bridge deck counterweight pouring during construction is a more effective measure in reducing UHPC tensile stress.
APPLIED SCIENCES-BASEL
(2023)
