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paper offers a general overview of the current practice for the vibration analysis of footbridges. 1 Background According to the AASHTO LRFD Guide Specifications for the Design of Pedestrian Bridges [1], pedestrian-induced vertical vibrations are negligible when the fundamental frequency in a vertical mode of the bridge is greater than 3.0 Hz.
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The bridge crane model system is composed of two main parts (Fig. 2) which are the moving system (the trolley) and the framework (structure).This example will serve to illustrate the method. We consider that the beam portion of the crane was simply supported and that it can be modelled adequately using the Euler-Bernoulli beam theory.
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Abstract and Figures. The purpose of this chapter is to examine methods to control induced vibrations in steel and reinforced concrete (RC) highway bridges caused by three …
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The purpose of this paper is to study the dynamic response of a cable‐stayed bridge to a vehicle moving across rough bridge decks. The vehicle was simulated by a nonlinear vehicle model with seven degrees of freedom according to the HS20‐44 truck. The cable‐stayed bridge was modeled as a planar bar system.
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When the bridge structure does not have loads passing on it, the vibrations that occur come from earth/microseismic vibrations, vibrations due to wind and surroundings. The maximum acceleration of vibration when there is no train passing is very small, namely 0.003751 g in the x direction (east–west), 0.001450 g in the y direction (north ...
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The Z24 Bridge vibration data were used to test the methodology's robustness in differentiating outlier differences. An example result plot of LTS residuals for temperature and first natural frequency Vs. MCD …
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Applied Mechanics and Materials, 2015. Nowadays, vehicle-induced vibration is a subject matter interest in the bridge monitoring field. As compared to other types of excitation such as earthquake and accidental impact, the vehicle-induced vibration is often being less considered during the design process of the bridge.
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The typical wind-induced vibrations of bridge structures include flutter (Zhang et al, 2021), galloping (Yu et al, 2022a), buffeting (Cui et al, 2022), and vortex-induced vibration (VIV) (Ge et al, 2022). These vibrations generally can be mitigated or eliminated through modifications to the aerodynamic shape of the bridge, known as aerodynamic ...
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Ground-based multi-input multi-output (GB-MIMO) radar has significant advantages in bridge structural vibration parameter measurement due to its non-contact, high frame rate, and high-precision measurement characteristics. Due to the complexity of the environment, traditional methods of selecting pixels based on permanent scatterers (PS) cannot accurately …
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This paper presents a feasibility study on the implementation of a novel power-oriented adaptive self-powered active control system to bridge cable for enhanced vibration mitigation performance. A 135 m full-scale bridge stay cable model under a moderate wind speed (10 m/s) was selected as the demonstration example.
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In the same year, wide range of experimental studies were also conducted which included bridge vibration analysis using FE model [13], [18]. As addition, field vibration testing is another method that has been preferred lately in vibration-based methods to complement numerical computation results from FE bridge model. The recent preferences on ...
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Tacoma Narrow Bridge Vibration and Collapse. Tacoma Narrows Bridge Collapse (all ages) This 1940 news clip documents the large vibrations and then collapse of the Tacoma Narrows Bridge in 42 mile-per-hour winds. (2:35 minute video) Lessons Learned from the Collapse of the Tacoma Narrows Bridge from Washington State Department of Transportation ...
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More Bridge Forces: Resonance. You can think of resonance as the vibrational equivalence of a snowball rolling down a hill and becoming an avalanche. It begins as a relatively small, periodic stimulus of a mechanical …
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The effect of different pedestrian densities (0.2, 0.5, 1, 1.5 and 4.6 persons/m2) on a pedestrian bridge is studied, the comfort level is evaluated according to the acceleration …
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Identifying bridge frequencies using a movable test vehicle is highly regarded for its mobility, cost-effectiveness, and broad monitoring coverage. Although experiments have shown effectiveness in extracting the fundamental bridge frequency, there are certain challenges in identifying higher-order frequencies, primarily owing to the impact of road surface roughness …
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Vibration also is an important factor in the reliable performance of LED lights. But it is often ignored. ... A luminaire passed the 3G test means it can withstand the worst-case vibrations. This standard states that bridge or overpass luminaires are tested at 3.0 G. Luminaires for other places are tested at 1.5 G. Any loosened parts that can ...
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the bridge deck response calculated by the model to actual measurement data, a better understanding of the nature and origin of bridge deck vibrations is created. 2 Haringvliet bridge project 2.1 Haringvliet bridge The Haringvliet bridge is a steel box-girder bridge. Its total length is 1220 metres, with ten
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1. Introduction. Vehicle actions represent the main operational loading for various types of bridges. The moving vehicle can produce structural vibrations [1], which provide vital information for the bridge design, assessment, maintenance, and reinforcement [2], [3], [4].In particular, vibrations of the bridge and vehicle are always coupled, resulting in a complex …
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The Z24 Bridge vibration data were used to test the methodology's robustness in differentiating outlier differences. An example result plot of LTS residuals for temperature and first natural frequency Vs. MCD distance is presented in Figure 2. As can be seen, all six regions contain some data points. Region 3 contains normal behavior data ...
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The dynamic response of a simply supported box girder bridge due to a vehicle moving across the span is presented. The effect of the randomly varying dynamic force generated by the vehicle moving over a rough bridge deck is considered in the analysis. A ...
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Vibrations Design Guide 11 Fig. 2.1 Recommended peak acceleration for human comfort for vibrations due to human activities Pedestrian Bridge Response • Vertical Vibration • Lateral Vibration Pedestrian Bridge Response • Vertical Vibration (also apply to floor vibration) F t P 1 i …
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Compared to vertical vibration, people are known to be much more sensitive to lateral vibrations. If a person walks on a laterally vibrating bridge, he or she will try to compensate by swaying with the bridge displacement for stability. This adjustment is accompanied by an intuitive adaptation of the walking frequency and a widened gait.
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One of the earliest vibration-based SHM tests used to study the changes in the dynamic properties was performed on an existing prestressed concrete bridge to study the …
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VIV is a limited-amplitude vibration with a self-excited nature and it could affect the comfort of drivers and pedestrians on the bridge (Ehsan and Scanlan, 1990) (Ge et al., 2022). Although …
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Paradoxically, for some specific combinations of the bridge vibration and pedestrian walking frequencies, a theoretical argument suggests 18,31 that the pedestrian can …
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Bridge vortex-induced vibration (VIV) refers to the vertical resonance phenomenon that occurs in a bridge when pulsating wind passes over it and causes vortices to detach. In recent years, VIV events have been …
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Hi all, long time lurker, first time posting. I'm designing a long span pedestrian bridge. It's a multispan steel girder bridge. A computer vibration analysis shows a vertical frequency of 1.9hz which is less than 3hz which is less than the AASHTO allowable in the pedestrian bridge spec. AASHTO allows the frequency below 3hz if the weight of the …
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The vibration analysis may used to investigate Structural heath monitoring. Seismic Simulations: Earthquakes pose a significant threat to bridge structures, particularly in seismically active regions. Seismic simulations are conducted to …
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Discussion of "Cable‐Stayed Bridge Vibration due to Road Surface Roughness" by Ton‐lo Wang and Dongzhou Huang (May, 1992, Vol. 118, No. 5) Previous. NEXT ARTICLE. Discussion of "Extraordinary Live Load in Office Buildings" by Edmund C. C. Choi (November, 1991, Vol. 117, No. 11) Next. Open in viewer.
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The structural vibration interacts with the flow, changing the fluid forces acting on the structure, and strongly nonlinear structural response with multifrequencies takes place . VIV may lead to …
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Bridge Vibrations. To study the resonant modes of a tied arch bridge, the bridge is first hit with a hammer or your hand. An FFT of the resulting vibrations are examined to find resonant modes. Then the bridge is driven with a sinusoidal force having...
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