Abstract
abstract: 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.
Highlights
Steel and concrete composite structures have been consolidated as a strong technological alternative in the Brazilian civil construction scenario, being increasingly adopted in commercial, parking, and residential buildings
With the emergence of materials with greater resistance, it has become increasingly feasible to reduce the total height of a composite floor system, seeking useful space improvement
Several authors [1]–[10] have developed important research with consistent and qualified investigations regarding the consideration of dynamic actions in the design of structures for human comfort assessment, based on experimental data and finite element models
Summary
Steel and concrete composite structures have been consolidated as a strong technological alternative in the Brazilian civil construction scenario, being increasingly adopted in commercial, parking, and residential buildings. With the emergence of materials with greater resistance, it has become increasingly feasible to reduce the total height of a composite floor system, seeking useful space improvement. This trend implies in reducing the system's stiffness, making these structures increasingly susceptible to the effects of dynamic loads induced by human activities, causing discomfort to users or even structural problems. Based on real values for such parameters, the structure evaluation in relation to acceptable vibration levels is performed with greater reliability
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