Vibration-Based Monitoring for Transverse Cooperative Working Performance of Assembled Concrete Multi-Girder Bridge: System Design, Implementation and Preliminary Application

Xu, Zhaoyuan; Dan, Danhui; Deng, Lu

doi:10.1142/s0219455421500437

Cited by 18 publications

(4 citation statements)

References 38 publications

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“…Many scholars and specialists have proposed various models of the relative displacement ∆ i . Li [26] utilized Equation (12) to express the relative displacement ∆ i . As shown in Equation (12), g i represents the shear force at joint-i generated by external load p, ω represents the maximum displacement of adjacent beams at the completely damaged joint when the dimensionless shear force g i = 1, and a [0, 1) represents the damage rate of joint-i.…”

Section: Modified Hinge Connected Beam Methods Considering Joint Damagementioning

confidence: 99%

“…Zhan et al proposed a damage-identification method based on vehicle-bridge interaction analysis and the modelupdating method; the existence and severity of damage in adjacent box beam bridges can be obtained by solving the minimization problem of the objective function that is constructed using the coherence function of the response spectrum (CFRS) index and frequency residual vectors [2]. Xu et al used structural vibration information collected by accelerometers and dynamic strain gauges installed at the bottom of girders in mid-span to identify transverse mode shape of the multi-beam system to evaluate the transmission performance of grouted joints of assembled concrete multi-girder bridges [12]. Hu et al proposed a hybrid method using physical models and vision-based measurements, and demonstrated the applicability of relative displacement ratio as the damage index of hollow-core slab bridge grouted joints by establishing a simplified spring-mass system wherein the relative displacement ratio of inspected hinge joints was extracted by computer vision-based multi-point displacement measurement methods [13].…”

Section: Introductionmentioning

confidence: 99%

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Low-Cost Assessment Method for Existing Adjacent Beam Bridges

Wang

Han

2022

Applied Sciences

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Damage in grouted joints is an unavoidable early disease in adjacent box beam bridges and hollow-core slab bridges. Joint damage will lead to degradation of the transverse load transmission capacity of the bridge, causing beams of the bridge superstructure to bear loads higher than the designed value, and eventually fail prematurely. Precise assessment of bearing--capacity degradation degree of adjacent box beam bridges and hollow-core slab bridges that are of great number is the keypoint to maintaining the serviceability of traffic network. The current specifications regard grouted joints as individual components and cannot correctly assess the degradation degree of bearing capacity caused by joint damage. In this paper, the traditional hinge connected beam method is improved by modifying deformation compatibility conditions at grouted joints. By using a modified hinge connected beam method, the relationship of joints at different locations with the lateral load distribution factor (LLDF) is analyzed. Based on analysis results, this paper proposes a new low-cost assessment method and a new assessment index that can utilize visual inspection results. Based on the concept of standard deviation, the proposed method assesses the degradation degree of the lateral load transmission performance of bridge superstructures by calculating the variation in LLDFs of beams, which is expressed by the lateral load distribution performance rating number LDN. The proposed method is applied to three real bridges. The accuracy of the calculation results is verified by comparing the ranking of LDNs of three bridges with the ranking of the variation degrees of lateral deflection influence lines of three bridges obtained from static-load test results.

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Section: Modified Hinge Connected Beam Methods Considering Joint Damagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-Cost Assessment Method for Existing Adjacent Beam Bridges

Wang

Han

2022

Applied Sciences

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“…Furthermore, the damaged hinge joints identified by the MAD method proposed by Xu et al (2021) based on transverse modes are listed in Table 5. The damages in Hinge joints 3, 5, 7, 11, 12, and 13 are identified by both methods.…”

Section: Evaluation Of Transverse Connection Conditionmentioning

confidence: 99%

“…Moreover, the index computed using time-domain strain exhibited slow convergence and poor real-time performance. Dan et al (2019a) and Xu et al (2021) proposed a method based on transverse displacement and strain modal shapes for transverse connection damage detection. These modal shapes were expressed as a product of longitudinal base functions and transverse proportional coefficient vectors, obtained through the resolution of a matrix eigenvalue problem.…”

Section: Introductionmentioning

confidence: 99%

Performance monitoring of assembled beam bridges using displacement spectrum similarity measure

Zheng,

Dan,

Zhong

2023

Advances in Structural Engineering

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The assembled beam bridge is a widespread construction, with transverse connections uniting precast beams to jointly support loads. These connections, while crucial, are the most vulnerable elements in such structures. Therefore, the development of an effective index for continuous condition assessment remains the cornerstone of structural health monitoring. The Displacement Spectrum Similarity Measure index, as per ideal conditions in numerical simulations, has shown insensitivity to short-term vehicle loads and sensitivity to transverse connection stiffness. This study extends its scope to address potential real-world interference factors, including measurement errors and deck pavement damage. Specifically, we introduce Gaussian white noise to simulate measurement errors and incorporate additional vehicle loads to emulate the impact of pavement damage. Numerical simulations confirm the robustness of the index against these challenges. Additionally, a real-time index extraction scheme is proposed and implemented on an operational bridge. The results reveal a close alignment between the transverse connection condition assessed by the index and the findings obtained through on-site surveys, thereby substantiating the viability and effectiveness of the index for real-world engineering contexts.

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