Dynamic geometry monitoring system and its application in Sutong Bridge construction

Zhang, Hong; Yang, Bing-Yan; Huang, Shongming

doi:10.1007/s11806-010-0019-1

Cited by 9 publications

(7 citation statements)

References 6 publications

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“…It can be seen from Table 1 that the accuracy obtained from one and five minutes is better than ±4 mm in both directions. Compared with the results obtained from ten minutes and one hour, the mean square error decreases with smaller data intervals and this complies with that of Zhang et al [26]. Therefore, the results indicated that the GPS positioning accuracy is better than ±6 mm; in addition, this accuracy is acceptable to measure the semistatic and dynamic performances of the towers.…”

Section: Gps Measurement Accuracy Assessmentsupporting

confidence: 87%

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Dynamic Performance Analysis of the Towers of a Long-Span Bridge Based on GPS Monitoring Technique

Kaloop¹,

2016

Journal of Sensors

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The present study investigates the parameter identification and the dynamic performance of a long-span bridge tower based on the output of a global positioning system (GPS) health monitoring system. The random decrement (RD) algorithm is used to estimate the tower displacement impulse response. Three methods are applied to extract the dynamic performance including least squares complex exponential (LSCE) method, Hilbert envelope method (HEM), and eigensystem realization algorithm (ERA). Results reveal that the HEM and LSCE method are more suitable to extract fundamental frequency and modal and damping ratios of the tower. Furthermore, the dynamic properties and statistical time series analysis of the GPS measurements illustrate that the traffic loads have a high significant impact on the semistatic and dynamic performances.

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Section: Gps Measurement Accuracy Assessmentsupporting

confidence: 87%

“…Zhang et al [26] estimated the measurement accuracy of monitoring GPS system based on statistical analysis for two days. Therefore, in this study, two days monitoring data, 11 and 12 January 2008, are considered for the analysis of the dynamic performance of the towers.…”

Section: Gps Measurement Accuracy Assessmentmentioning

confidence: 99%

Dynamic Performance Analysis of the Towers of a Long-Span Bridge Based on GPS Monitoring Technique

Kaloop¹,

2016

Journal of Sensors

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“…where ∀ means 'for any'; Equation (6) means that the value |Ψ f (τ, ϖ)| of a harmonic signal f (t) with frequency β could reach the local maximum at any point in time τ and only if the variable ϖ is equal to β, so we need to first determine ϖ; Equation (7) indicates that the local maximum can be regarded as the instantaneous amplitude when ϖ equals β, i.e., |Ψ f (τ, ϖ)| is exactly the harmonic signal itself. For another time point τ, repeating the steps yields the instantaneous frequency, phase, and amplitude [32].…”

Section: The Theory Of the 'Inaction Method'mentioning

confidence: 99%

Analysis of Vibration Characteristics of Bridge Structures under Seismic Excitation

Li,

Huang

2024

Entropy

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Bridges may undergo structural vibration responses when exposed to seismic waves. An analysis of structural vibration characteristics is essential for evaluating the safety and stability of a bridge. In this paper, a signal time-frequency feature extraction method (NTFT-ESVD) integrating standard time-frequency transformation, singular value decomposition, and information entropy is proposed to analyze the vibration characteristics of structures under seismic excitation. First, the experiment simulates the response signal of the structure when exposed to seismic waves. The results of the time-frequency analysis indicate a maximum relative error of only 1% in frequency detection, and the maximum relative errors in amplitude and time parameters are 5.9% and 6%, respectively. These simulation results demonstrate the reliability of the NTFT-ESVD method in extracting the time-frequency characteristics of the signal and its suitability for analyzing the seismic response of the structure. Then, a real seismic wave event of the Su-Tong Yangtze River Bridge during the Hengchun earthquake in Taiwan (2006) is analyzed. The results show that the seismic waves only have a short-term impact on the bridge, with the maximum amplitude of the vibration response no greater than 1 cm, and the maximum vibration frequency no greater than 0.2 Hz in the three-dimensional direction, indicating that the earthquake in Hengchun will not have any serious impact on the stability and security of the Su-Tong Yangtze River Bridge. Additionally, the reliability of determining the arrival time of seismic waves by extracting the time-frequency information from structural vibration response signals is validated by comparing it with results from seismic stations (SSE/WHN/QZN) at similar epicenter distances published by the USGS. The results of the case study show that the combination of dynamic GNSS monitoring technology and time-frequency analysis can be used to analyze the impact of seismic waves on the bridge, which is of great help to the manager in assessing structural seismic damage.

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“…However, the diversification of bridge structures and the continuous increase in span lengths have presented greater challenges in bridge design, construction, and management. While promoting the development of related industries, ensuring the structural safety of bridges has become a crucial concern for construction managers [11][12][13]. Ensuring structural safety has become an indispensable part of the bridge construction process.…”

Section: Introductionmentioning

confidence: 99%

Study on Construction Monitoring and Control of Multi-Span Prestressed Concrete Continuous Beam Bridge

Zheng,

Guan

2024

CEJ

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This article focuses on the construction monitoring and control of a pre-stressed concrete continuous beam bridge, consisting of 13 spans. The goal is to ensure that the bridge structure meets the design requirements throughout the entire construction process. By comparing the theoretical and measured values of the bridge’s alignment and stress during the cantilever construction, closure, and completion phases, it can be observed that the deflection deformation of the bridge is generally in agreement with the theoretical calculations. After the completion of the entire bridge, the measured elevations of each section have an error range of -18mm to 20mm compared to the design elevations, which satisfies the specifications. A comparison analysis of the measured and theoretical stress values at the root and mid-span of the cantilever indicates that the stress difference at the root is within the range of -0.2MPa to 0.2MPa, and the stress differences at the mid-span after completion are 0.03MPa (upper) and 0.09MPa (lower), all of which meet the structural design and code requirements. By establishing a gray GM (1,1) model and using gray system theory, the deflection error during the construction process is predicted and controlled. The prediction accuracy of different methods is compared to determine a reasonable prediction method suitable for long-span pre-stressed continuous beam bridges, providing reference for similar engineering projects.

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Dynamic geometry monitoring system and its application in Sutong Bridge construction

Cited by 9 publications

References 6 publications

Dynamic Performance Analysis of the Towers of a Long-Span Bridge Based on GPS Monitoring Technique

Dynamic Performance Analysis of the Towers of a Long-Span Bridge Based on GPS Monitoring Technique

Analysis of Vibration Characteristics of Bridge Structures under Seismic Excitation

Study on Construction Monitoring and Control of Multi-Span Prestressed Concrete Continuous Beam Bridge

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