Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2012.tde-16072013-172126
Document
Author
Full name
Leandro Marino Takazono Orbolato
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Brasil, Reyolando Manoel Lopes Rebello da Fonseca (President)
González Lima, Raúl
Tsuchida, Masayoshi
Title in Portuguese
Análise do comportamento sísmico das partes internas de um equipamento de proteção ambiental.
Keywords in Portuguese
Análise de estruturas
Dinâmica
Estruturas de aço
Sistemas não lineares
Terremotos
Abstract in Portuguese
Title in English
Analysis of seismic behavior of the internal parts of an environmental control equipment.
Keywords in English
Dynamics (analysis)
Earthquakes
Steel structures
Structures (analysis)
Abstract in English
In this work, the seismic behavior of the internal parts of an environmental control equipment is studied. The equipment, an electrostatic precipitator, is basic composed of an elevated large steel box, containing positive and negative electrodes that capture powdered material of industrial effluent gases. These internal components behave essentially as pendula. In the mathematical model seismic motions in two orthogonal directions are considered. It is interesting to realize that the pendular electrodes are free to swing in one plane but not in the other plane. Four increasingly complex nonlinear models are analyzed, with one, two and three degrees of freedom, as well as one 3-degree-of-freedom linearized model. The generalized coordinates of the most complete model are the two horizontal displacements of the top mass and the angular motion of the pendulum. Lagranges formulation is used to derive the equations of motion of the models. These are second order nonlinear ordinary differential equations. The base seismic motions, that are stochastic in nature, are replaced by a arbitrarily chosen existing seismic record. The models parameters are carefully chosen to a good prediction of the equipment under seismic support excitation. Numerical integration of the mathematical model is performed, and comparisons are made of the several models response submitted to free vibrations and to an existing seismic record.