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http://dx.doi.org/10.5000/EESK.2015.19.3.103

Extracting Modal Parameters of a Layered Stone Pagoda Using TDD Technique  

Kim, Byeong Hwa (Kyungnam University, Dept. of Civil Eng)
Moon, Dae Joong (EJtech Co. Ltd.)
Lee, Do Hyung (Paichai University, Dept. of Civil, Environmental and Railroad Eng)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.19, no.3, 2015 , pp. 103-108 More about this Journal
Abstract
This work introduces a modal testing and analysis results of the mock-up for a layered stone pagoda. The pagoda has been horizontally excited by an impact hammer. As to the measured acceleration time responses, the first five lower mode shapes and natural frequency are extracted by the TDD technique. It is observed that the time delay of a shear wave occurs through friction surfaces. Such phenomena cannot be described by using the traditional analytical models such as a continuum cantilever beam model or a discrete shear building model. However, the time delay typically affects only the phases of the pagoda system. The frequencies of the pagoda system are not affected by such time delay. It is found in the first time that the layered stone pagoda system has a set of closely placed modes in near of natural frequency. It is believed that such modes are due to the friction characteristics in friction surfaces. Based on the stick-slip friction model, it seems that the one of the closely placed mode can be a self-excited one.
Keywords
Stone pagoda; Mode shape; Modal parameters; Time delay; Stick-slip model;
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Times Cited By KSCI : 1  (Citation Analysis)
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