Evaluation of dynamic behavior of waffle slab to gym center

Abstract

In Brazil, the use of reinforced concrete waffle slab in multi-story buildings is widespread nowadays. These buildings are projected for different purposes such as fitness centers, supermarkets, parking garages, offices and residential units. Simple activities as walking, skipping and jumping can generate vibrations in these slabs. Vibrations can cause inconvenience in persons, questions about structure´s safety, and collapse risk that it is determined by its intensity of vibrations. The objective of this paper is evaluating the behavior of reinforced concrete waffle slabs due to the human rhythmic activities. Slabs are modeled by finite elements method using the SAP2000 program. The results are verified according to Brazilian and international codes. The waffle slabs are submitted to high-levels of acceleration and velocity generating discomfort in users.

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

“…Most studies and standards report that human discomfort occurs in structures with a natural frequency below 8 Hz, however, Brownjohn and Middleton [13] analysed in their study that structures with a frequency above 10 Hz also presented significant dynamic responses. Araújo and Costa [14] also came to similar findings. The authors studied the dynamic behavior of three concrete slabs and realized that, despite the displacements found in these structures meeting the recommendations of ABNT NBR 6118 [15], the peak accelerations for models with a natural frequency greater than 10 Hz exceeded the imposed limits for human comfort.…”

Investigation of a vibration mitigation method based on crowd flow control on a footbridge

“…The described pedestrian load is regarded only as a dynamic load applied to the structure, while its influence on structural mode is not sufficiently taken into account [39,40]. Thus, following a recent study on crowd-structure interaction, the MSD model at each personal location is applied 11 to the structure [26].…”