Online Deflection Monitoring System for Dafosi Cable-Stayed Bridge

Zhu, Yudan; Fu, Yumei; Chen, Weimin; Huang, Shiyun

doi:10.1177/1045389x06055826

Cited by 30 publications

(17 citation statements)

References 1 publication

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“…For example, a geodetic surveys system can provide a precision of measurement of only 3 mm or so [9]. Another example is that the realistic precision reached by the hydrostatic leveling system decreases drastically with varying liquid temperature although the theoretic precision is estimated as about 0.5 mm [10].…”

Section: Introductionmentioning

confidence: 99%

Study on non-contact weighted-stretched-wire system for measuring bridge deflections and its effect factors

Lan

Yang

Chen

et al. 2008

Engineering Structures

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Section: Introductionmentioning

confidence: 99%

Study on non-contact weighted-stretched-wire system for measuring bridge deflections and its effect factors

Lan

Yang

Chen

et al. 2008

Engineering Structures

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“…A CPS (Figure b), using pressure transmitters to detect the changes of liquid levels in the connected pipes, was designed and mounted on this bridge for vertical deflection monitoring. The deflections can be deduced by using simple formulas from the detected changes of liquid levels . The performance of the CPS has been verified through both controlled and uncontrolled load tests as reported in the authors' previous studies .…”

Section: Applicationmentioning

confidence: 74%

Serviceability assessment for long-span suspension bridge based on deflection measurements

Deng

Chen

et al. 2018

Struct Control Health Monit

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Summary Serviceability issues related to service load deformations is of great importance to in‐service bridge maintenance decision making. Development in structural health monitoring brings opportunities to serviceability assessment for long‐span bridges. In this study, a reliability assessment framework of traffic‐induced vertical deflection is developed by incorporating extreme values analysis and system reliability with deflection measurements. The framework includes the following steps: (a) identifying traffic‐induced deflection by eliminating temperature component and extracting local extremes from the original measurements; (b) probabilistically modeling the peaks‐over‐threshold (POT) data to the generalized Pareto distribution (GPD); (c) selecting proper threshold of the GPD based on the mean residual life plot and goodness‐of‐fit tests; (d) extending the GPD to generalized extreme value distribution‐based extreme value distribution with the assumption of filtered Poisson process; and (e) assessing the serviceability reliability of vertical deflection by using the concept of series system. The multisensor deflection measurements, which were collected by a previously verified system installed on a suspension bridge, are processed and studied according to the proposed framework. The results indicate that the best GDP fitting of the POT data can be obtained due to the proposed threshold selection strategy. The quasisystem reliability approach also shows its ability in addressing the relationship between the reliabilities of the multiple sections equipped with sensors and presenting a reasonable overall reliability for the prototype bridge.

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“…Liu et al [22] discussed a connected pipe system based deflection monitoring and condition evaluation for a suspension bridge in China, and a series of load tests were also conducted to validate the proposed system. Zhu et al [23] presented the health monitoring system on Dafosi Bridge. The deflections of this bridge were mainly obtained through a communicating optoelectronic pipe sensor, namely the connected pipe system.…”

Section: Introductionmentioning

confidence: 99%

A Plastic Optical Fiber Sensing System for Bridge Deflection Measurement

Yang

Wang

Ren

et al. 2020

Sensors

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Deflection is one of the key parameters that reflects the state of a bridge. However, deflection measurement is difficult for a bridge that is under operation. Most existing sensors and measuring techniques often do not meet the requirements for health monitoring for various types of bridges. Therefore, based on changes of optical fiber intensity, a novel sensing system using connected pipes to measure bridge deflection in different positions is proposed in this paper. As an absolute reference, the liquid level position along the structure is adopted for the deflection measurement, and an additional external reference to the ground is not needed in this system. The proposed system consists of three parts: connected pipes to connect the measurement points along the structure, liquid to fill in the connected pipes, and the sensing element to detect the change of level. A plastic optical fiber sensor based on the intensity change is used as the sensing element of the developed system. Then, a set of experimental tests are conducted for performance evaluation purposes. Results show that this system has an accurate linear response and high reliability under various environmental conditions. The deflection of the test beam measured by the sensor agrees with linear variable differential transformer (LVDT) within an error margin of 2.1%. The proposed system shows great potential applicability for future health monitoring of long-span bridges.

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Online Deflection Monitoring System for Dafosi Cable-Stayed Bridge

Cited by 30 publications

References 1 publication

Study on non-contact weighted-stretched-wire system for measuring bridge deflections and its effect factors

Study on non-contact weighted-stretched-wire system for measuring bridge deflections and its effect factors

Serviceability assessment for long-span suspension bridge based on deflection measurements

A Plastic Optical Fiber Sensing System for Bridge Deflection Measurement

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