cable stayed bridge
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Structures ◽  
2022 ◽  
Vol 37 ◽  
pp. 168-184
Jinxiang Zhang ◽  
Mingjin Zhang ◽  
Xulei Jiang ◽  
Renan Yuan ◽  
Jisheng Yu ◽  

2022 ◽  
pp. 136943322110499
Jianying Ren ◽  
Bing Zhang ◽  
Xinqun Zhu ◽  
Shaohua Li

A new two-step approach is developed for damaged cable identification in a cable-stayed bridge from deck bending strain responses using Support Vector Machine. A Damaged Cable Identification Machine (DCIM) based on support vector classification is constructed to determine the damaged cable and a Damage Severity Identification Machine (DSIM) based on support vector regression is built to estimate the damage severity. A field cable-stayed bridge with a long-term monitoring system is used to verify the proposed method. The three-dimensional Finite Element Model (FEM) of the cable-stayed bridge is established using ANSYS, and the model is validated using the field testing results, such as the mode shape, natural frequencies and its bending strain responses of the bridge under a moving vehicle. Then the validated FEM is used to simulate the bending strain responses of the longitude deck near the cable anchors when the vehicle is passing over the bridge. Different damage scenarios are simulated for each cable with various severities. Based on damage indexes vector, the training datasets and testing datasets are acquired, including single damaged cable scenarios and double damaged cable scenarios. Eventually, DCIM is trained using Support Vector Classification Machine and DSIM is trained using Support Vector Regression Machine. The testing datasets are input in DCIM and DSIM to check their accuracy and generalization capability. Different noise levels including 5%, 10%, and 20% are considered to study their anti-noise capability. The results show that DCIM and DSIM both have good generalization capability and anti-noise capability.

2022 ◽  
Dan Fitzwilliam

<p>This will be the second cable-stayed bridge in the city of Los Angeles. In order to mitigate the potential for resonant vibrations during passage of groups of equestrians, a system of tuned mass dampers was designed for the bridge. High-stressed cables are incrementally attached to the 38-meter-tall mast and configured in a fan pattern.</p>

2022 ◽  
Vol 250 ◽  
pp. 113414
Chao Zhang ◽  
Jianian Wen ◽  
Qiang Han ◽  
Xiuli Du ◽  
Zhichao Lai ◽  

Structures ◽  
2022 ◽  
Vol 35 ◽  
pp. 289-302
Yitong Gu ◽  
Junjun Guo ◽  
Xinzhi Dang ◽  
Wancheng Yuan

2022 ◽  
Vol 250 ◽  
pp. 113436
Yanru Wu ◽  
Xiaohong Wu ◽  
Junxin Li ◽  
Haohui Xin ◽  
Qing Sun ◽  

2022 ◽  
Vol 134 ◽  
pp. 625-636
Ahad Javanmardi ◽  
Khaled Ghaedi ◽  
Zainah Ibrahim ◽  
Fuyun Huang ◽  
Mieczysław Kuczma ◽  

2021 ◽  
Vol 12 (1) ◽  
pp. 242
Guohui Zhao ◽  
Zhichao Wang ◽  
Shuo Zhu ◽  
Jianming Hao ◽  
Jun Wang

This paper investigated the aerodynamic response features of an asymmetric cable-stayed bridge. The wind resistance design parameters for judging the response were first determined, afterwards the bridge dynamic characteristics were analyzed for subsequent aerodynamic analysis. The vortex-induced vibrations (VIV) and flutter response at various wind fairing angles were then examined by using a 1:50 sectional model in the wind tunnel test. Finally, a 1:150 full bridge aeroelastic model was employed to explore the aerodynamic stability and characteristics of the whole asymmetric bridge under different wind attack angles in various flow fields. The results show that the sharp wind fairings could reduce the VIV amplitude of the steel box girder cable-stayed bridge to some extent, and the example bridge has examined to have enough flutter stability through sectional and full bridge aeroelastic model wind tunnel tests. Unlike symmetric bridges, the bridge’s maximum displacement of first torsion mode shape is at the closure rather than the mid-span, which is the essential reason to lead this unique vibration feature. The results from the present study could highlight the important effect of structural asymmetry and fairing shape to the wind-induced bridge vibration and hence may facilitate more appropriate wind design of asymmetric cable-stayed bridges.

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