The real-time alarming technique of ship-collision to long-span bridges based on the displacement data of expansion joints

With the application of Global Positioning System (GPS) echnology using in the field of modern transport, more and more long-span bridges have set up the GPS system to monitor the real-time deformation in safety monitoring system. Nowadays the highest measuring accuracy of GPS technology achieves millimeter, and the sampling frequency can reach 20Hz. It can solve real-time deformation data and adapt to the complexity and poor working environment. Based on the application of GPS technology using in long-span bridges safety monitoring system, this paper set the Huangpu bridge as the engineering project and demonstrate how to apple the GPS technology in deformation monitoring and security evaluation.

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Vehicle-Induced Dynamic Response of Expansion Joints in Long Span Bridges

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.584-586.2117 ◽

2014 ◽

Vol 584-586 ◽

pp. 2117-2120

Author(s):

Zhen Sun ◽

Yu Feng Zhang

Keyword(s):

Dynamic Response ◽

Newmark Method ◽

Expansion Joint ◽

Expansion Joints ◽

Long Span Bridges ◽

Finite Element Software ◽

Long Span ◽

Vehicle Impact ◽

Vehicle Loading ◽

Analysis Scheme

Due to increasing traffic on long span bridges, behavior of expansion joints is believed to be largely influenced by pounding impact from passing vehicles. In order to precisely understand behavior of expansion joint under vehicle impact loading, a new analysis scheme is proposed which incorporates interaction between vehicle and expansion joint. Mathematical model of vehicle is established and solved with Newmark method. Expansion joint is modeled with refined solid element in Finite element software ABAQUS. The analysis indicates that vehicle loading can induce large dynamic response of expansion joint in long span bridges.

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Effect of Expansion Joints on Long-Span Bridges on Driving Behavior: A Driving Simulator Study

CICTP 2020 ◽

10.1061/9780784483053.338 ◽

2020 ◽

Author(s):

Ya-Di Huang ◽

Xiao-Peng Song ◽

Wei Wu ◽

Wen-Jun Du ◽

Feng Chen ◽

...

Keyword(s):

Driving Simulator ◽

Driving Behavior ◽

Expansion Joints ◽

Long Span Bridges ◽

Long Span ◽

Simulator Study

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Finite element analysis of long-span rail-cum-road cable-stayed bridge subjected to ship collision

Advances in Structural Engineering ◽

10.1177/1369433219846953 ◽

2019 ◽

Vol 22 (11) ◽

pp. 2530-2542

Author(s):

Qianhui Pu ◽

Jingwen Liu ◽

Hongye Gou ◽

Yi Bao ◽

Hongwei Xie

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Dynamic Responses ◽

Maximum Displacement ◽

Element Analysis ◽

Long Span Bridges ◽

Cable Stayed Bridge ◽

Long Span ◽

Ship Collision ◽

Collision Force

Ship collision is rare, yet it leads to serious consequences once it occurs, in particular for long-span bridges. This study investigates dynamic responses of a long-span, rail-cum-road cable-stayed bridge under ship collision through finite element analysis. Three ship tonnages were investigated, which are 3000, 5000, and 8000 t, respectively. The displacement, velocity, and acceleration of the bridge under ship collision are analyzed. The collision process is simulated in two explicit steps to improve the computational efficiency. First, the collision force is determined through a collision simulation of the ship to a rigid body that simulates the massive bridge pier. The collision force is then applied to the bridge to analyze the dynamic responses of the bridge. The simulation results of the collision force are compared with four different design codes. Analysis results from different codes show significant discrepancies, demonstrating lack of reliability of the formula recommended by the codes. The results indicate that the maximum displacement and acceleration occur at the top of the bridge pylon. The bridge’s responses under ship collision decrease as the collision angle increases from 0° to 20°.

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Analysis of the dynamic response of long span bridges with GNSS under typhoon loading

Maritime Technology and Research ◽

10.33175/mtr.2022.254407 ◽

2021 ◽

Vol 4 (3) ◽

pp. Manuscript

Author(s):

Hongbo Wang ◽

Xiaolin Meng ◽

Chaohe Chen

Keyword(s):

Dynamic Response ◽

Real Time ◽

Deformation Monitoring ◽

Bridge Management ◽

Time Data ◽

Engineering Structures ◽

Long Span Bridges ◽

Long Span ◽

Long Span Bridge ◽

Cross Correlation Analysis

Nowadays, real-time bridge deformation monitoring has attracted more attention due to the development of bridge management system and land transportation safety. Huge civil engineering structures, such as long-span bridge, is susceptible to dynamic deflection caused by various loadings. Hence, precise dynamic response measurement becomes necessary to make structure more reliable and integrated. Currently, Global Navigation Satellite System (GNSS) positioning technology has been commonly used in this field to detect the dynamic displacement of long-span bridges. According to this, real-time data were collected from the Forth Road Bridge to observe the dynamic response of lang span bridges under extreme wind load conditions and this report has also verified the data processing technique of the real-time bridge deformation monitoring system. Compared with other monitoring methods, the method used in this report which combines GNSS and anemometer together has features of high frequency with low lag. Moreover, it also shows the superiority of post-processing and synchronization, background noises could be reduced by embedded software. Finally, according to the cross-correlation analysis, it was found that wind speed and bridge displacement in y-axis have the highest correlation. Also, the reliability of combining method to monitor the dynamic response of long-span bridge and noise reducing method proposed in this report has also been verified.

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Automated Real-Time Assessment of Stay-Cable Serviceability Using Smart Sensors

Applied Sciences ◽

10.3390/app9204469 ◽

2019 ◽

Vol 9 (20) ◽

pp. 4469 ◽

Cited By ~ 2

Author(s):

Seunghoo Jeong ◽

Young-Joo Lee ◽

Do Hyoung Shin ◽

Sung-Han Sim

Keyword(s):

Real Time ◽

Damping Ratio ◽

Assessment System ◽

Smart Sensors ◽

Stay Cable ◽

Long Span Bridges ◽

Long Span ◽

Stay Cables ◽

High Flexibility ◽

Cable Stayed Bridges

The number of cable-stayed bridges being built worldwide has been increasing owing to the increasing demand for long-span bridges. As the stay-cable is one of critical load-carrying members of cable-stayed bridges, its maintenance has become a significant issue. The stay-cable has an inherently low damping ratio with high flexibility, which makes it vulnerable to vibrations owing to wind, rain, and traffic. Excessive vibration of the stay-cable can cause long-term fatigue problems in the stay-cable as well as the cable-stayed bridge. Therefore, civil engineers are required to carry out maintenance measures on stay-cables as a high priority. For the maintenance of the stay-cables, an automated real-time serviceability assessment system using wireless smart sensors was developed in this study. When the displacement of the cable in the mid-span exceeds either the upper or the lower bound provided in most bridge design codes, it is considered as a serviceability failure. The system developed in this study features embedded on-board processing, including the measurement of acceleration, estimation of displacement from measured acceleration, serviceability assessment, and monitoring through wireless communication. A series of laboratory tests were carried out to verify the performance of the developed system.

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Investigation of temperature actions on flat steel box girders of long-span bridges with temperature monitoring data

Advances in Structural Engineering ◽

10.1177/1369433218766946 ◽

2018 ◽

Vol 21 (14) ◽

pp. 2099-2113 ◽

Cited By ~ 5

Author(s):

Yang Deng ◽

Aiqun Li ◽

Yang Liu ◽

Suren Chen

Keyword(s):

Temperature Distribution ◽

Effective Temperature ◽

Ambient Air ◽

Temperature Gradients ◽

Box Girders ◽

Expansion Joints ◽

Long Span Bridges ◽

Long Span ◽

Flat Steel

The worldwide application of streamlined flat steel box girder on long-span bridges calls for more knowledge of its temperature distribution. The rapid development of structural health monitoring techniques offers a great opportunity to address this issue. A comprehensive approach of installing monitoring equipment, collecting data, and applying long-term temperature monitoring data to study the temperature distribution of flat steel box girders is developed. As demonstrated through the analysis of 1-year data of a suspension bridge, first, a mapping relation between effective temperature and ambient air temperature is established. Such a relation enables identifying the optimal time to finally join the flat steel box girders at the designed effective temperature based on the easy-to-obtain ambient air temperature. Second, the cycling variation of effective temperature is presented to provide information for design and assessment of expansion joints and bearings, including not only the maximum design displacements but also cumulative displacements related to the long-term durability and remaining life of expansion joints and bearings. Finally, both vertical and transverse temperature gradients are studied to provide some new insights about the temperature characteristics of flat steel box girders. The study suggests that the transverse and vertical temperature gradients should be applied to the bridge cross section individually since the data analysis supports that the two gradients are independent.

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