The effect of load position to the accuracy of deflection measured with LVDT sensor in I-girder bridge

Hidayat, Irpan; Suangga, Made; Maulana, Moh Reshki

doi:10.1088/1755-1315/109/1/012024

Cited by 3 publications

(4 citation statements)

References 2 publications

(3 reference statements)

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“…The deflection limit check applies to the center of the span. The critical value of maximum displacement is more significant than (L/400) according to the National Annex e-UT 07.01.12 [8], as presented in Equation (1). Bridge engineers commonly use this limit to evaluate the serviceability of the bridge.…”

Section: Discussion Of Static Deflection Resultsmentioning

confidence: 99%

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Evaluation of the Szapáry Long-Span Box Girder Bridge Using Static and Dynamic Load Tests

2023

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This paper presents the results of a recent field test carried out before the opening phases of the Szapáry motorway bridge across the Tisza River in central Hungary. The evaluation test was based on static and dynamic load tests that provided information on deflection, stresses, and dynamic mode shapes along the bridge. The structure has two large continuous independent steel box girders that cover spans across the floodplain and river. Various configurations of truck loading applied up to 6400 kN of loading on the deck. During the static tests, string potentiometers recorded deflections at mid-span. Additionally, strain gauges enabled strain/stress measurements at the mid-point of the longest span and directly above one support. Dynamic loadings showed variation in deflection response due to vehicle speed, and ambient vibration testing led to determining vibration modes and frequencies. A three-dimensional finite-element model produced similar deflections, stresses, and modal behavior. Measured and modeled deflections and stresses indicated that the bridge performed within design margins. The testing and analysis results will be part of a future program assessing conditioned-based maintenance.

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Section: Discussion Of Static Deflection Resultsmentioning

confidence: 99%

“…The serviceability of long-span bridges will decrease over time; the primary source of this decreasing function is the cyclic load on the girders caused by the vehicle loadings [1]. One parameter to determine bridge serviceability is the vertical deflection of the spans.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Szapáry Long-Span Box Girder Bridge Using Static and Dynamic Load Tests

2023

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“…A linear variable differential transformer (LVDT) is the most reliable and accurate direct displacement measurement sensor with an accuracy of 0.01 mm [3]. Unfortunately, the installation of such fixed contact sensors is an enormously challenging task.…”

Section: Structural Health Monitoring Of Bridgesmentioning

confidence: 99%

Outlier Detection Based on Nelder-Mead Simplex Robust Kalman Filtering for Trustworthy Bridge Structural Health Monitoring

Bao

Sun

et al. 2023

Remote Sensing

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Structural health monitoring (SHM) is vital for ensuring the service safety of aging bridges. As one of the most advanced sensing techniques, Global Navigation Satellite Systems (GNSS) could capture massive spatiotemporal information for effective bridge structural health monitoring (BSHM). Unfortunately, GNSS measurements often contain outliers due to various factors (e.g., severe weather conditions, multipath effects, etc.). All such outliers could jeopardize the accuracy and reliability of BSHM significantly. Previous studies have examined the feasibility of integrating the conventional multi-rate Kalman filter (MKF) with an adaptive algorithm in the data processing processes to ensure BSHM accuracy. However, frequent parameter adjustments are still needed in tedious data processing processes. This study proposed an outlier detection method using a Nelder-Mead simplex robust multi-rate Kalman filter (RMKF) for supporting trustworthy BSHM using GNSS and accelerometer. In the end, the authors have validated the proposed method using the monitoring data collected at the Wilford Bridge in the UK. Results showed that the accuracy of the total dynamic vibration displacement time series has been improved by 21% compared with the results using the conventional MKF approach. The authors envision that the proposed method will shed light on reliable and explainable data processing policy and trustworthy BSHM.

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“…In literature, both contact and non-contact sensors or techniques are widely used for measuring displacement responses of engineering infrastructures. For instance, the linear variable differential transformer (LVDT) is a highly sensitive transducer for displacement measurement in a specific direction [1][2][3]. As it requires solid base support during measurements, its applications are highly limited.…”

Section: Introductionmentioning

confidence: 99%

Full-Field Bridge Deflection Monitoring with Off-Axis Digital Image Correlation

Lan

Jian-hui

Pan

et al. 2021

Sensors

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Video deflectometer based on using off-axis digital image correlation (DIC) has emerged as a robust non-contact optical tool for deflection measurements of bridges. In practice, a video deflectometer often needs to measure the deflections at multiple positions of the bridge. The existing 2D-DIC-based measurement methods usually use a laser rangefinder to measure the distance from each point to the camera to obtain the scale factor for the point. It is only suitable for the deflection measurements of a few points since manually measuring distances for a large number of points is time consuming and impractical. In this paper, a novel method for full-field bridge deflection measurement based on off-axis DIC is proposed. Because the bridge is usually a slender structure and the region of interest on the bridge is often a narrow band, the new approach can determine the scale factors of all the points of interest with a spatial straight-line fitting scheme. Moreover, the proposed technique employs reliability-guided processing and a fast initial parameter estimation strategy for real-time and accurate image-matching analysis. An indoor cantilever beam experiment verified the accuracy of the proposed approach, and a field test of a high-speed railway bridge demonstrated the robustness and practicability of the technique.

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The effect of load position to the accuracy of deflection measured with LVDT sensor in I-girder bridge

Cited by 3 publications

References 2 publications

Evaluation of the Szapáry Long-Span Box Girder Bridge Using Static and Dynamic Load Tests

Evaluation of the Szapáry Long-Span Box Girder Bridge Using Static and Dynamic Load Tests

Outlier Detection Based on Nelder-Mead Simplex Robust Kalman Filtering for Trustworthy Bridge Structural Health Monitoring

Full-Field Bridge Deflection Monitoring with Off-Axis Digital Image Correlation

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