Middle displacement monitoring of medium–small span bridges based on laser technology

Zhang, Lixiao; Liu, Peng; Xu, Yuye; Zhao, Xuefeng

doi:10.1002/stc.2509

Cited by 25 publications

(6 citation statements)

References 19 publications

(22 reference statements)

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“…The cross-sectional area of the single-limb thin-walled pier is similar to that of the double-limb thinwalled pier, but the thrust stiffness of the single-limb thinwalled pier when subjected to force is much stronger than the force on the double-limb thin-walled pier [24]. Hence, the flexibility of the box type single-limb thin-walled pier will be worse under the same conditions, but it can be improved by increasing the pier height of the single-limb thin-walled pier, which can also increase the longitudinal displacement of the bridge top [25]. In the construction of roads and bridges in China's west region, single-limb thinwalled piers are showing increasingly obvious superiority facing increasingly higher piers.…”

Section: Types Of Pier Structure Of the Continuous Rigid-framementioning

confidence: 99%

The Influence of Buckling Mode and Buckling Stability Coefficient of Rigid-Frame Bridge during Construction in Cold Region

Zhang²,

Wang

2022

Geofluids

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The study aims to further standardize the construction process, improve the construction quality, and ensure the stability of infrastructure construction. The continuous rigid-frame bridge is taken as the research object, the finite element model of the bridge body is established by using the beam element, and the overall stability of the rigid-frame bridge is analyzed in the construction and completion stages. Moreover, the stability coefficient and buckling mode are established under different working conditions in each stage, the linear stability variation law is summarized, and the geometric nonlinear stability analysis method is established through the specific data. The nonlinear stability safety factor and buckling mode are obtained, and the influence of wind load and initial defects on the stability of continuous rigid-frame bridge is further explored. The results show that with the increase of the bridge height, the overall stability factor of the bridge is decreasing, and the safety factor of the single-limb thin-walled hollow pier is relatively larger than that of the double-limb thin-walled hollow pier. During the construction, the asymmetric self-weight load caused by the asynchronous load and cantilever pouring has the greatest impact on the stability of the bridge. The stability safety factor of the geometric nonlinear stability analysis method constructed is 0.3% and 1.27% lower than the ideal state, respectively. The stability safety factor of the wind load and the initial defect is 12.65% lower than the ideal state, and the stability safety factor is greatly reduced. The results have important reference significance to ensure the construction safety and overall stability of the bridge.

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Section: Types Of Pier Structure Of the Continuous Rigid-framementioning

confidence: 99%

The Influence of Buckling Mode and Buckling Stability Coefficient of Rigid-Frame Bridge during Construction in Cold Region

Zhang²,

Wang

2022

Geofluids

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“…The total midspan deflection calculated with the FE model is

δ_{md} = 34.4 mm

(

L / 305

). The authors notice that, due to local conditions and the nonavailability of noncontact measuring systems (as the ones used by Zhang et al 38 and Jiao et al 39 ), it was not possible to measure the actual deflection of São Silvestre footbridge on site.…”

Section: Numerical Studymentioning

confidence: 99%

Modal identification and damping performance of a full‐scale GFRP‐SFRSCC hybrid footbridge

Dacol

Caetano

Correia³

2022

Structural Contr & Hlth

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Slender footbridges are prone to excessive vibrations due to pedestrian effects, and comfort criteria often govern their design. In this sense, composite materials that combine high damping capacity with relatively high stiffness and low mass can provide functional benefits. This paper presents a study of the dynamic behaviour of an 11 m long hybrid footbridge made of two I-shaped pultruded glass fibre reinforced polymer (GFRP) main girders and a thin steel fibre reinforced self-compacting concrete (SFRSCC) deck, in operation since 2015. The main goals were (i) to improve the knowledge of the dynamic properties of composite footbridges and (ii) to assess the benefits of using a structure made of pultruded GFRP instead of a conventional material (steel), namely, considering its greater ability to dissipate energy. The resonant frequencies, damping ratios, and mode shapes of the footbridge were identified based on experimental testing. A finite element (FE) model of the footbridge was developed and calibrated with test data and used to simulate the effects of pedestrian loads. Simulations of the same type were conducted on an equivalent structural system made of steel profiles. The simulation results of the two short-span footbridges with similar natural frequencies enhance the impact of high-order harmonics of the pedestrian load in the dynamic response. It is also shown that polymer-based components can contribute to limiting vibrations in footbridges or even act as self-dampers.

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“…Marendić et al used a robotic total station fxed at a distance from the bridge to measure its defection with the accuracy of ±2.2 mm at 20 Hz sampling frequency [10]. Zhang et al [11] achieved 0.2 mm dynamic defection measurement accuracy based on laser projection and image processing technology. Linear variable diferential transformers (LVDTs) have higher measurement accuracy, albeit they are more difcult to install [12].…”

Section: Introductionmentioning

confidence: 99%

Reference Point-Free Measurement of Bridge Dynamic Deflection by Fusing Hydraulic Leveling and Accelerometer Signals

Jin

Xia

Wen-bo

et al. 2023

Structural Control and Health Monitoring

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Structural health monitoring (SHM) is widely applied to assess the service condition of bridges. Deflection measurements are essential to determine a bridge’s performance, and in particular, dynamic deflection is increasingly required in SHM. However, continuous and high-precision measurements of the absolute dynamic deflection are challenging without a reference point placed at a distance from the bridge. We proposed a reference point-free dynamic deflection measurement system consisting of a level sensor and an accelerometer. The level sensor measures the low-frequency deflection components, while the accelerometer measures the high-frequency deflection components. We redesigned the level sensor from the hydrostatic level sensor and further provided a correction method to achieve the dynamic deflection measurement. A numerical algorithm fuses the signals from the level sensor and accelerometer to obtain the absolute dynamic deflection, and key parameters are calculated. The accuracy of the measurement system was tested in the laboratory, and the sensor results were similar to the ones obtained by the laser test under simple harmonic and random excitations. Field tests conducted on a T-shaped rigid frame bridge with random traffic flow indicate that the system can achieve continuous high-precision deflection measurements of bridges loaded by traffic flow.

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Middle displacement monitoring of medium–small span bridges based on laser technology

Cited by 25 publications

References 19 publications

The Influence of Buckling Mode and Buckling Stability Coefficient of Rigid-Frame Bridge during Construction in Cold Region

The Influence of Buckling Mode and Buckling Stability Coefficient of Rigid-Frame Bridge during Construction in Cold Region

Modal identification and damping performance of a full‐scale GFRP‐SFRSCC hybrid footbridge

Reference Point-Free Measurement of Bridge Dynamic Deflection by Fusing Hydraulic Leveling and Accelerometer Signals

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