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On the equation of motion governing the dynamics of vertically collapsing buildings

Celso Pupo Pesce 1952- Leonardo Casetta; Flávia Maria Teixeira dos Santos

Journal of Engineering Mechanics New York p. 1-29, 12 April 2012

New York 2012

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  • Título:
    On the equation of motion governing the dynamics of vertically collapsing buildings
  • Autor: Celso Pupo Pesce 1952-
  • Leonardo Casetta; Flávia Maria Teixeira dos Santos
  • Assuntos: DINÂMICA DAS ESTRUTURAS; TENSÃO ESTRUTURAL; RESISTÊNCIA DOS MATERIAIS
  • É parte de: Journal of Engineering Mechanics New York p. 1-29, 12 April 2012
  • Descrição: The present paper aims at contributing to a discussion, opened by several authors, on the proper equation of motion that governs the vertical collapse of buildings. The most striking and tragic example is that of the World Trade Center twin towers, in New York city, about ten years. Surely this is a very complex problem and, besides dynamics, the analysis involves several areas of knowledge in mechanics, such as structural engineering, materials sciences and thermodynamics, among many others. Therefore, the goal of this work is far from claiming to deal with the problem in its completeness, leaving aside discussions about the modeling of the resistive load to collapse, for example. However, the following analysis, restricted to the study of motion, shows that the problem in question holds great similarity to the classic "falling-chain problem", very much addressed in a number of different versions as the pioneering one, by von Buquoy or the one by Cayley. Following previous works, a simple single degree of freedom model is readdressed and conceptually discussed. It is shown that the form of the Lagrange equation which leads to a proper equation of motion for the collapsing building is a general and extended dissipative form, which is proper for systems with mass varying explicitly with position. The additional dissipative generalized force term which is present in the extended form of the Lagrange equation is shown to be derivable from a Rayleigh-like energy function.
  • Editor: New York
  • Data de criação/publicação: 2012
  • Formato: p. 1-29.
  • Idioma: Inglês
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