Ratcheting occurrence conditions of piping under sinusoidal excitations

Ratcheting is one of the dominant failure modes under excessive earthquakes and may cause extreme failures of structures (e.g., collapse). We focused on clarifying the ratcheting mechanism of piping under sinusoidal excitations. Both finite element analyses and experiments were conducted on bent sol...

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Autores principales:	Jinqi LYU, Masakazu ICHIMIYA, Ryunosuke SASAKI, Naoto KASAHARA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	ratcheting seismic piping supports frequency ratio phase delay finite element method Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/23423e50dd31411b8dbb4785977f5bf2
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id	oai:doaj.org-article:23423e50dd31411b8dbb4785977f5bf2
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spelling	oai:doaj.org-article:23423e50dd31411b8dbb4785977f5bf22021-11-29T05:59:26ZRatcheting occurrence conditions of piping under sinusoidal excitations2187-974510.1299/mej.20-00167https://doaj.org/article/23423e50dd31411b8dbb4785977f5bf22020-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/4/7_20-00167/_pdf/-char/enhttps://doaj.org/toc/2187-9745Ratcheting is one of the dominant failure modes under excessive earthquakes and may cause extreme failures of structures (e.g., collapse). We focused on clarifying the ratcheting mechanism of piping under sinusoidal excitations. Both finite element analyses and experiments were conducted on bent solid bars, which represented piping in this study. Seismic ratcheting occurred due to the combined effect of constant external compressive force and cyclic vibrations. The external compressive force acted as a load-controlled load. Vibrations were applied to provide the source of the dynamic load. Characteristics of vibrations between load-controlled and displacement-controlled properties were studied from the viewpoint of the frequency ratio of the forcing frequency to the natural frequency of the piping model. In addition, the influence of supports on the occurrence of ratcheting was also considered. The results showed that the resonance effect was evident in the piping model compared with the beam model due to the limited plastic area in the piping model. The vibration with a lower frequency had load-controlled characteristics. In contrast, the vibration with a higher frequency presented displacement-controlled properties. In terms of the occurrence of ratcheting, providing more supports sometimes increased the possibility of the occurrence of ratcheting under relatively higher forcing frequencies because more supports increased the natural frequency and decreased the frequency ratio.Jinqi LYUMasakazu ICHIMIYARyunosuke SASAKINaoto KASAHARAThe Japan Society of Mechanical Engineersarticleratchetingseismicpipingsupportsfrequency ratiophase delayfinite element methodMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 4, Pp 20-00167-20-00167 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	ratcheting seismic piping supports frequency ratio phase delay finite element method Mechanical engineering and machinery TJ1-1570
spellingShingle	ratcheting seismic piping supports frequency ratio phase delay finite element method Mechanical engineering and machinery TJ1-1570 Jinqi LYU Masakazu ICHIMIYA Ryunosuke SASAKI Naoto KASAHARA Ratcheting occurrence conditions of piping under sinusoidal excitations
description	Ratcheting is one of the dominant failure modes under excessive earthquakes and may cause extreme failures of structures (e.g., collapse). We focused on clarifying the ratcheting mechanism of piping under sinusoidal excitations. Both finite element analyses and experiments were conducted on bent solid bars, which represented piping in this study. Seismic ratcheting occurred due to the combined effect of constant external compressive force and cyclic vibrations. The external compressive force acted as a load-controlled load. Vibrations were applied to provide the source of the dynamic load. Characteristics of vibrations between load-controlled and displacement-controlled properties were studied from the viewpoint of the frequency ratio of the forcing frequency to the natural frequency of the piping model. In addition, the influence of supports on the occurrence of ratcheting was also considered. The results showed that the resonance effect was evident in the piping model compared with the beam model due to the limited plastic area in the piping model. The vibration with a lower frequency had load-controlled characteristics. In contrast, the vibration with a higher frequency presented displacement-controlled properties. In terms of the occurrence of ratcheting, providing more supports sometimes increased the possibility of the occurrence of ratcheting under relatively higher forcing frequencies because more supports increased the natural frequency and decreased the frequency ratio.
format	article
author	Jinqi LYU Masakazu ICHIMIYA Ryunosuke SASAKI Naoto KASAHARA
author_facet	Jinqi LYU Masakazu ICHIMIYA Ryunosuke SASAKI Naoto KASAHARA
author_sort	Jinqi LYU
title	Ratcheting occurrence conditions of piping under sinusoidal excitations
title_short	Ratcheting occurrence conditions of piping under sinusoidal excitations
title_full	Ratcheting occurrence conditions of piping under sinusoidal excitations
title_fullStr	Ratcheting occurrence conditions of piping under sinusoidal excitations
title_full_unstemmed	Ratcheting occurrence conditions of piping under sinusoidal excitations
title_sort	ratcheting occurrence conditions of piping under sinusoidal excitations
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/23423e50dd31411b8dbb4785977f5bf2
work_keys_str_mv	AT jinqilyu ratchetingoccurrenceconditionsofpipingundersinusoidalexcitations AT masakazuichimiya ratchetingoccurrenceconditionsofpipingundersinusoidalexcitations AT ryunosukesasaki ratchetingoccurrenceconditionsofpipingundersinusoidalexcitations AT naotokasahara ratchetingoccurrenceconditionsofpipingundersinusoidalexcitations
_version_	1718407574119776256

Ratcheting occurrence conditions of piping under sinusoidal excitations

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