An efficient approach for considering the effect of human-structure interaction on footbridges

Zäll, Emma; Andersson, Andréas; Ülker-Kaustell, Mahir; Karoumi, Raid

doi:10.1016/j.proeng.2017.09.337

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…The operational lifespan of a pedestrian bridge is intricately tied to the influence of individuals traversing it, mainly the number of people crossing, their activities, and the duration of their presence on the bridge [27], resulting in modifications to its dynamic aspect and modal attributes. Generally, pedestrians exhibit a proclivity for coordinated interactions while crossing a bridge in order not to intersect.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Assessment of the Structural Behavior of a Pedestrian Bridge Aiming to Characterize and Evaluate Its Comfort Level

El Dahr,

Lignos,

Papavieros

et al. 2023

Buildings

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The assessment of infrastructure integrity is considered paramount to verify its structural health and to build its resilience. In this study, a monitoring strategy, consisting of a pre-developed microcontroller-based data acquisition system (DAQ) hardware and a software program for post processing built on LabVIEW platform, was conducted to assess the structural behavior of an arch-and-tie pedestrian bridge located in Haidari, Greece, following its construction phase. This endeavor aimed to delineate its systemic state and to verify the fulfillment of comfort criteria stated by EN1990, HIVOSS and SETRA guidelines. To this end, four trademark Bridge Diagnostic Inc. (BDI) triaxial accelerometers were meticulously deployed along the bridge expanse to scrutinize the structure’s response toward a spectrum of induced perturbations. The established framework effectively compiled the acquired acceleration time domain then employed a Butterworth bandpass filter to derive the bridge eigenfrequencies, eigenmodes, and damping ratios. The resultant findings conclusively indicate that the bridge response towards pedestrian crossing conforms to the established specifications and thus does not necessitate the installation of dampers. The bridge maintains comfortable structural integrity for pedestrian traversal up to an upper frequency limit of 3.67 Hz, substantiating its ability to absorb the dissipated energy generated by pedestrian movement.

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Section: Introductionmentioning

confidence: 99%

Dynamic Assessment of the Structural Behavior of a Pedestrian Bridge Aiming to Characterize and Evaluate Its Comfort Level

El Dahr,

Lignos,

Papavieros

et al. 2023

Buildings

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“…Disturbance or stimulation can be induced by congestion or crowding, wind force and ground vibration during its existence [49]. Significantly, the lifespan of an operative pedestrian bridge depends on and is associated with the influence of the people crossing it, causing a modification of its dynamic aspect and modal characteristics [50]. Zall et al, (2017) suggested an approach to calculate the acceleration of a simply supported footbridge but is limited to vertical direction only [50].…”

Section: Introductionmentioning

confidence: 99%

“…Significantly, the lifespan of an operative pedestrian bridge depends on and is associated with the influence of the people crossing it, causing a modification of its dynamic aspect and modal characteristics [50]. Zall et al, (2017) suggested an approach to calculate the acceleration of a simply supported footbridge but is limited to vertical direction only [50]. Omidalizarandi et al, (2020) introduced a new technique based on time series investigations called RT-MPI that can automatically calculate modal parameters.…”

Section: Introductionmentioning

confidence: 99%

Design and Validation of an Accurate Low-Cost Data Acquisition System for Structural Health Monitoring of a Pedestrian Bridge

Dahr¹,

Lignos²,

Papavieros³

et al. 2022

J. Civ. Eng. Constr.

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Structural health monitoring (SHM) is an effective operating technique devoted to enhance the robustness of an infrastructure, and to validate its safety requirements. The aim of SHM is to determine a structure’s reaction when subjected to any type of excitation, by means of identifying modifications in basic vibration measurements and modal parameters such as natural frequencies, damping and mode shapes. Consequently, sensors are mounted on a structure intending to record data on equal time intervals basis prior to, during and after an induced stimulation. Therefore, the necessity to adopt a computer-based data acquisition (DAQ) technique is required in this analytical approach in order to evaluate vibrational signals collected by sensors placed on a structure. In this work an accurate microcontroller-based DAQ system is proposed to monitor a pedestrian bridge located in Athens Greece for the purpose of characterizing the system state and evaluate the modal properties of the investigated structure. Four low-cost yet accurate triaxial accelerometers were systematically placed along the bridge intending to report the system response toward different generated perturbations. The proposed monitoring and computational system was tested in laboratory conditions prior to the bridge assessment. Three triaxial accelerometer were installed on a steel cantilever beam. A comparative analysis between the results of the suggested DAQ system and that of the standard laboratory DAQ system National Instrument DAQ was performed to test the accuracy of the suggested framework.

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“…where G is the average weight of a pedestrian; f p is the pacing frequency; ϕ i is the phase lag of the i-th harmonic and α i the Fourier coefficient of the i-th harmonic. Different sources provide expressions of the Fourier series that are not exact but rather fitted to certain factors and measuring results [19][20][21][22][23]. The time function of the dynamic load of pedestrians pacing is reached at the frequency of 2 Hz.…”

mentioning

confidence: 99%

The Influence of Different Loads on the Footbridge Dynamic Parameters

et al. 2020

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Bringing together the experience and knowledge of engineers allowed building modern footbridges as very slender structures. This in turn has led to structural vibration problems, which is a direct consequence of slender structures. In some footbridges, this problem occurs when natural construction frequencies are close to excitation frequencies. This requires a design methodology, which would ensure user safety and convenience of use of the footbridge in operation. Considering the aforementioned dynamic response, the analysis of the finite element model of a footbridge was conducted focusing on critical acceleration and deformation meanings. The model was based on the footbridge prototype located in Vilnius, Lithuania. Two different loading methods were developed to investigate the dynamic effects caused by people crossing a footbridge. The comparison of experimental and finite element model (FEM) results revealed that the footbridge in operation is within the limit values of comfort requirements in terms of its vibrations.

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An efficient approach for considering the effect of human-structure interaction on footbridges

Cited by 4 publications

References 9 publications

Dynamic Assessment of the Structural Behavior of a Pedestrian Bridge Aiming to Characterize and Evaluate Its Comfort Level

Dynamic Assessment of the Structural Behavior of a Pedestrian Bridge Aiming to Characterize and Evaluate Its Comfort Level

Design and Validation of an Accurate Low-Cost Data Acquisition System for Structural Health Monitoring of a Pedestrian Bridge

The Influence of Different Loads on the Footbridge Dynamic Parameters

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