Human-induced vibration of cold-formed steel floor systems: Parametric studies

Zhang, Sigong; Xu, Lei

doi:10.1177/1369433220904013

Cited by 9 publications

(4 citation statements)

References 37 publications

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“…[1,2]. This can be explained due to the fact that these human activities present excitation frequencies close to natural frequencies values of most structures, in the range of 4 Hz to 8 Hz [1][2][3][4][5][6]. This way, in this research work the main objective is to evaluate the people-structure dynamic interaction effect on the structural behaviour of building floors, through the development of experimental tests and numerical modelling.…”

Section: Introductionmentioning

confidence: 99%

Assessment of steel‐concrete composite floors dynamic response when subjected to people walking

Aguiar,

Ferreira,

Carvalho

et al. 2023

ce papers

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This work aims to assess the people‐structure dynamic interaction effect on the steel‐concrete composite floor's structural behaviour, based on of experimental tests and numerical modelling. The investigated structure is associated to a steel‐concrete composite floor building with total area of 1300 m2. In this investigation, biodynamic systems like “spring‐mass‐damper” models with one degree of freedom (SDOF) were used to simulate the people's walking on the floor. The numerical model, developed for the floor building dynamic analysis, adopted the usual mesh refinement techniques present in finite element method (FEM) simulations implemented in the ANSYS software. Based on the experimental results calibration, the floor dynamic response was analysed to study the influence of the people's step frequencies, number of people walking and stationary on the floor, structural damping, and different trajectories of people walking. The floor dynamic response was determined based on the displacement and acceleration values, and compared with those calculated utilising traditional dynamic loading mathematical models. After that, the structural system dynamic response maximum values were compared with the recommended limits proposed in design codes for excessive vibration's assessments to study the human comfort.

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Section: Introductionmentioning

confidence: 99%

Assessment of steel‐concrete composite floors dynamic response when subjected to people walking

Aguiar,

Ferreira,

Carvalho

et al. 2023

ce papers

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show abstract

“…Reports show that structures with high fundamental frequencies, represented by timber floors, behave completely different compared with structures that have low fundamental frequencies (Hu, 2000; Onysko, 1986). Because of their high fundamental frequencies and high damping ratios, the responses are usually characterized by a series of impulses corresponding to the continuous steps of occupants, instead of being dominated by near-resonant vibration (Zhang and Xu, 2020). The features of an impulse, i.e., peak or root-mean-square value, are usually not much affected by previous or following impulses.…”

Section: Introductionmentioning

confidence: 99%

A design-oriented method for response prediction of light-weight timber floors under bouncing excitation

Wang

Zeng

Cheng

et al. 2022

Advances in Structural Engineering

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Owing to the light weight and high fundamental frequency, timber floors exhibit impulse-like responses under human-induced excitation, which is different with the resonance-like responses for heavy concrete structures. The vibration serviceability of timber floors thus needs to be considered in a different manner. Many design codes for timber structures have required that the static displacement or dynamic response under human excitation should be limited within a threshold for the purpose of serviceability, while failing to provide appropriate method for predicting structural responses considering various affecting factors. Inspired by the idea of response spectrum, this paper proposed a design-oriented method for the peak acceleration prediction of high-frequency floors under human bouncing excitation. The prediction can be obtained for any desired confidence level. Statistical analysis shows that the acceleration responses are mostly dependent on structural fundamental frequency, structural damping ratio, and excitation frequency, which are considered in the proposed mathematical model. The application procedure and the experimental assessment of the proposed model are provided, showing the decent applicability of the proposed method.

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“…Venuti et al [21] demonstrated that, in addition to the dynamic structure-pedestrian interaction, it is also important to analyse the different walking paths that can be performed by users, as well as speed and step length. Following this same line of study, Zhang and Xu [22] carried out a parametric analysis in order to determine the difference in floor responses associated with four walking paths: parallel and perpendicular to the floor beams, diagonal and circular. The authors concluded that the path leads to the greatest responses depends on the floor attachment conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of induced human walking vibrations on steel-concrete composite floors

Ferreira

Carvalho

Silva

et al. 2021

Rev. IBRACON Estrut. Mater.

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This work presents the experimental evaluation of the dynamic behavior of Steel and concrete composite floors, from a human comfort point of view, when submitted to human walking. The structural model investigated was a real composite floor system under construction, with a total area of approximately 1300 m2. A preliminary numerical model was developed in order to guide the ideal positioning of excitation and instrumentation to be adopted in the experimental “in situ” evaluation. Next, free vibration tests were carried out to obtain the modal parameters of the structure. More than 180 forced vibration tests with excitation caused by a person walking at different step frequencies and directions were performed to determine de maximum structure’s response. The results found were compared with human comfort criteria recommended by national and international standards and design guides. Subsequently, a people quantity influence analysis on the dynamic response of the floor was carried out, where it was noticed that the increase in the number of users walking on the floor also increased the peak acceleration value. This fact emphasizes the need to carry out experimental evaluations considering the variation of people quantity on floor activity in order to evaluate the real scenario of human vibrations induced in the structure under service.

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Human-induced vibration of cold-formed steel floor systems: Parametric studies

Cited by 9 publications

References 37 publications

Assessment of steel‐concrete composite floors dynamic response when subjected to people walking

Assessment of steel‐concrete composite floors dynamic response when subjected to people walking

A design-oriented method for response prediction of light-weight timber floors under bouncing excitation

Experimental evaluation of induced human walking vibrations on steel-concrete composite floors

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