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IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century


IASS Symposium 2016

SESSION: General: Towers & Temporary Structures; Preservation

On the hyperbolic shell geometry of natural draught cooling towers for effective structural design

< Table of Contents for General: Towers & Temporary Structures; Preservation
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: General: Towers & Temporary Structures; Preservation
  • Pages: 10
  • Title: On the hyperbolic shell geometry of natural draught cooling towers for effective structural design
  • Author(s): Sang-Yun Lee, Sam-Young Noh
  • Keywords: natural draught cooling tower, hyperbolic shell geometry, natural frequency analysis, nonlinear FE analysis, global damage indicator
Abstract
The form-finding of a hyperbolic shell is the most important process in the natural draught cooling tower design. The result of the previous work leads to the idea that the inner area of the hyperbolic shell generator should be minimized for the cooling tower with higher first natural frequency. In this study, the inner area of the 1-shell or 2-shell hyperbolic generator was determined graphically under varying height of the throat and the angle of the base lintel. From the graph, several shell geometries were selected and analyzed based on natural frequency. Three representative cooling towers were selected for the analysis of the structural behavior by means of nonlinear finite element (FE) method and evaluated using a damage indicator based on the change of natural frequencies. The results show that the damage behaviour of the cooling tower reinforced heavily due to a lower first natural frequency is not necessarily advantageous than the other two.

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