Finite element analysis of high modal dynamic responses of a composite floor subjected to human motion under passive live load

Behnia, Arash; Kueh, Ahmad Beng Hong; Shabazi, Mohammad Mehdi; Ranjbar, Navid; Behnia, Nima; Vafaei, Mohammadreza

doi:10.1590/s1679-78252013000300009

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…To carry out the procedure, the flowchart defined by Figure 3 illustrates the execution process of this step. The experimental part of the work consisted of carrying out the heel impact test on the cantilevered region of the structure, at the points numbered from P1 to P5, defined in the cantilevered region, according to Figure 4, and at the points P6, P7, P8, P9, P10, P11, P12 and P13, located in other regions of building, with dimensions in mm, to excite the structure and obtain the vibrational parameters of the slab [16,17].…”

Section: Experimental Phasementioning

confidence: 99%

Experimental and Numerical Dynamic Evaluation of Profiled Steel Decking Slab in a Container House Using Mems

Tavares Lima,

Ernesto de Medeiros Alas,

Narcizo de Almeida Nunes

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The reuse of shipping containers is common in civil construction, not only for ecological reasons but also for speeding up the construction time, thus favoring the decrease in the payback time of the applied financial investment. Consequently, technological developments guarantee this trend with lighter structural elements, thus occurring natural frequencies closer to the frequency ranges of dynamic excitations associated with human activities. Therefore, a direct consequence of this new design trend is a considerable increase in problems related to unwanted vibrations in steel and concrete composite slabs, which arise from rhythmic actions, and external vibrations arising from earthquakes, which must be analysed to meet the comfort and safety of residents. Thus, this study aims to present a vibration analysis in a composite floor slab, built in steel deck 59S, of a residence built with reuse maritime containers in the municipality of Gravatá in Pernambuco, Brazil. The structure consists of three floors, with the cantilever slab analysed with dimensions of 8.24 m wide and 4.00 m long. In the experimental phase, vibration analysis was carried out through the heel impact test to obtain the natural frequencies, which had average values of 7.0 Hz, and average values of 7.14% for the damping ratio of the slab, a MicroElectroMechanical System (MEMS) was used, which are accelerometers of signals present in smartphone devices. Subsequently, using the software SCIA Engineer, the numerical analysis of the model was carried out, where usual discretization techniques were used through the Finite Element Method (FEM) to evaluate the structural behavior against dynamic actions, thus obtaining the results of natural frequencies, average values of 6.46 Hz, and modal shapes. With this, it was possible to verify the results regarding the natural frequencies of vibration, analysing the usability, comfort, and health of the structure according to the current normative codes. Finally, this study presents a comparison of modal parameters in numerical and experimental simulations against the dynamic actions that must be considered in the design of steel deck slabs when in a cantilever situation for the type of structure studied to validate comfort and building safety caused by dynamic effects developed by human behavior.

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Section: Experimental Phasementioning

confidence: 99%

Experimental and Numerical Dynamic Evaluation of Profiled Steel Decking Slab in a Container House Using Mems

Tavares Lima,

Ernesto de Medeiros Alas,

Narcizo de Almeida Nunes

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…In 2006, Sahnaci and Kasperski presented a model of random loads induced by walking [7]. Behnia et al [8] provided a review of several load models: Half-Sine Pulse (proposed by Bachmann and Ammann 1987), Dynamic loading using Fourier series (based on summing up a group of sine waves of various frequencies, magnitudes and phases, convenient for human loading) and expansion to crowds, according to the relation:…”

Section: Introductionmentioning

confidence: 99%

“…Diagram of longitudinal strain deformation of the main box girder of bridge crane during malicious crane swinging with two persons (Measuring no.11, May 2014) According to Eq. (2) on the basis of previous features of the crane bouncing process and dynamic load described by Fourier series[8], a multiplicative oscillatory linearized function of excitation is set. This multiplicative function F M (t) is a product of people weight G 0 , linearized countur amplitude function F L (t) and harmonic function F H (t).Value of the maximum amplitude of excitation human weight force G 0 is determined on the basis of experimental testing and it has individual character.…”

mentioning

confidence: 99%

A Human Crowd Effect Modelled by the Discrete-Time Fourier Series

Jovanović

Radoičić

2018

FU Work Liv Env Prot

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Accidental actions caused by vibrations of supporting structures in mechanical systems represent the dynamic tasks of specific scientific and professional research in the field of human and equipment safety. This paper determines the mathematical model of physical excitation force created by human power, based on the discrete-time Fourier transformation. For experimental verification of the model, we made a special platform for measuring bouncing force of people who create natural impulse oscillation. The paper shows the results of individual and group experimental testing of living force as the cause of accidents and dangerous effects on the structure. In the end, the excitation of the human operation of a malicious nature (heavy transport machine – crane) has been used to show the application of Fourier model to simulate one incident. For this purpose, the transient FEM analysis and the eigenvalues predetermined modal analysis are used. The paper is illustrated with photographs of experimental tests of dangerous human impulse in several working machines (objects).

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Probabilistic Model Updating of Controller Models for Groups of People in a Standing Position

Ortíz

Caicedo

2016

Dynamics of Coupled Structures, Volume 4

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Finite element analysis of high modal dynamic responses of a composite floor subjected to human motion under passive live load

Cited by 7 publications

References 15 publications

Experimental and Numerical Dynamic Evaluation of Profiled Steel Decking Slab in a Container House Using Mems

Experimental and Numerical Dynamic Evaluation of Profiled Steel Decking Slab in a Container House Using Mems

A Human Crowd Effect Modelled by the Discrete-Time Fourier Series

Probabilistic Model Updating of Controller Models for Groups of People in a Standing Position

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