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MECSOL 2022
8th International Symposium on Solid Mechanics
TMD's optimization for dynamic analysis of footbridges excited by pedestrians.
Submission Author:
Victor Casulli de Oliveira , SP
Co-Authors:
Victor Casulli de Oliveira, Reyolando Brasil
Presenter: Victor Casulli de Oliveira
doi://10.26678/ABCM.MECSOL2022.MSL22-0119
Abstract
In this work, optimization techniques for vibration absorbers (Tuned Mass Dumpers) will be presented for dynamic analysis of footbridges excited by pedestrians. Two software’s will be used to carry out this procedure, MIDAS CIVIL and MATLAB. First, a bi-beam supported by finite elements will be modeled to represent the walkway board using MIDAS CIVIL. With such a model, it is possible to obtain the modal mass, modal stiffness and frequency. Next, a two-degree-of-freedom model will be presented that represents the critical vibration mode of the structure, close to the excitation frequency, together with the TMD. The system with 2 DOF will be implemented in MATLAB software to represent a Vertical TMD and a Horizontal TMD, modeled with a pendulum. Using MATLAB tools, the TMD mass ratio is optimized for the total mass of the footbridge. The optimization has the objective function of minimizing the difference between the maximum acceleration of the dynamic system and the limit acceleration recommended by standards for human comfort. With the TMD's dimensioned, they will be modeled in MIDAS CIVIL to verify if the optimization parameters were reached.
Keywords
Footbridges, Optimization, Tuned Mass Dumper, Dynamic Systems, Vibration
