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


IASS Symposium 2016

SESSION: Seismic Analysis, Behavior & Design

Damping Evaluation of Spherical Pre-stressed Concrete Shell by Filtering and Half-power Bandwidth Method

< Table of Contents for Seismic Analysis, Behavior & Design
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Seismic Analysis, Behavior & Design
  • Pages: 10
  • Title: Damping Evaluation of Spherical Pre-stressed Concrete Shell by Filtering and Half-power Bandwidth Method
  • Author(s): Kiyoshi Shingu, Kiyotoshi Hiratsuka, Norio Kondo, Toshihiro Irie
  • Keywords: damping ratio, spherical shell, half-power bandwidth method, filter design, impact vibration examination (IVE), velocity
Abstract
Damping phenomena of vibration of structures is well-known as one of important natures. Measures on damping ratios of the structures have been carried out based on microtremor observation or impact vibration examination (IVE), because damping ratios of structures are not able to be evaluated theoretically. The authors carried out IVE of a spherical pre-stressed concrete shell which was for the planetarium in Narashino city in 2011. The accuracy of evaluated damping ratio at that time was not sufficient because of the large deviation of damping ratios. In this research, the band-pass filtering process is applied to results measured by IVE, and then the filter design is devised. The damping ratio is evaluated by the half-power bandwidth method. The deviation of damping ratios of the shell obtained by using the proposed method becomes small, and the damping ratio of the shell by the IVE is verified around 2.0%.

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