Study on ratcheting of beams under the combination of gravity and seismic load

Ratcheting is one common phenomenon under excessive earthquakes. This study focuses on clarifying the ratcheting mechanism of beams subjected to the combination of gravity and seismic loadings. The sinusoidal excitations or their combinations represented the seismic loadings. Gravity acted as load-c...

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Autores principales:	Jinqi LYU, Masakazu ICHIMIYA, Md Abdullah Al BARI, Ryunosuke SASAKI, Naoto KASAHARA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2019
Materias:	ratcheting beam seismic loading gravity frequency ratio Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/0d8a7ff9c71a4d69bdbf8acadf9ca780
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spelling	oai:doaj.org-article:0d8a7ff9c71a4d69bdbf8acadf9ca7802021-11-29T05:56:30ZStudy on ratcheting of beams under the combination of gravity and seismic load2187-974510.1299/mej.19-00384https://doaj.org/article/0d8a7ff9c71a4d69bdbf8acadf9ca7802019-11-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/3/7_19-00384/_pdf/-char/enhttps://doaj.org/toc/2187-9745Ratcheting is one common phenomenon under excessive earthquakes. This study focuses on clarifying the ratcheting mechanism of beams subjected to the combination of gravity and seismic loadings. The sinusoidal excitations or their combinations represented the seismic loadings. Gravity acted as load-controlled loading and was applied by the self-weight of the beam as well as the additional mass put at the free end of the beam. A cyclic acceleration was applied at the base of the beam to provide the source of dynamic loading assumed as seismic loading. Equivalent loading conditions were put in experiments as in numerical analysis to validate the nonlinear finite element analyses. The analogy between thermal ratcheting and vibration ratcheting was considered to investigate the characteristics of cyclic accelerations. The frequency effects on the applied alternating accelerations were also investigated in this research. The results show that input waves containing the lower frequency components than the natural frequency are more damageable comparing to that containing higher frequency ones. Besides, the component with lower frequency contributes more to the occurrence of ratcheting. The characteristics of dynamic loading due to base acceleration depend on the loading frequency. The low-frequency acceleration acts like load-controlled loading, while the high-frequency acceleration is close to displacement-controlled loading.Jinqi LYUMasakazu ICHIMIYAMd Abdullah Al BARIRyunosuke SASAKINaoto KASAHARAThe Japan Society of Mechanical Engineersarticleratchetingbeamseismic loadinggravityfrequency ratioMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 3, Pp 19-00384-19-00384 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	ratcheting beam seismic loading gravity frequency ratio Mechanical engineering and machinery TJ1-1570
spellingShingle	ratcheting beam seismic loading gravity frequency ratio Mechanical engineering and machinery TJ1-1570 Jinqi LYU Masakazu ICHIMIYA Md Abdullah Al BARI Ryunosuke SASAKI Naoto KASAHARA Study on ratcheting of beams under the combination of gravity and seismic load
description	Ratcheting is one common phenomenon under excessive earthquakes. This study focuses on clarifying the ratcheting mechanism of beams subjected to the combination of gravity and seismic loadings. The sinusoidal excitations or their combinations represented the seismic loadings. Gravity acted as load-controlled loading and was applied by the self-weight of the beam as well as the additional mass put at the free end of the beam. A cyclic acceleration was applied at the base of the beam to provide the source of dynamic loading assumed as seismic loading. Equivalent loading conditions were put in experiments as in numerical analysis to validate the nonlinear finite element analyses. The analogy between thermal ratcheting and vibration ratcheting was considered to investigate the characteristics of cyclic accelerations. The frequency effects on the applied alternating accelerations were also investigated in this research. The results show that input waves containing the lower frequency components than the natural frequency are more damageable comparing to that containing higher frequency ones. Besides, the component with lower frequency contributes more to the occurrence of ratcheting. The characteristics of dynamic loading due to base acceleration depend on the loading frequency. The low-frequency acceleration acts like load-controlled loading, while the high-frequency acceleration is close to displacement-controlled loading.
format	article
author	Jinqi LYU Masakazu ICHIMIYA Md Abdullah Al BARI Ryunosuke SASAKI Naoto KASAHARA
author_facet	Jinqi LYU Masakazu ICHIMIYA Md Abdullah Al BARI Ryunosuke SASAKI Naoto KASAHARA
author_sort	Jinqi LYU
title	Study on ratcheting of beams under the combination of gravity and seismic load
title_short	Study on ratcheting of beams under the combination of gravity and seismic load
title_full	Study on ratcheting of beams under the combination of gravity and seismic load
title_fullStr	Study on ratcheting of beams under the combination of gravity and seismic load
title_full_unstemmed	Study on ratcheting of beams under the combination of gravity and seismic load
title_sort	study on ratcheting of beams under the combination of gravity and seismic load
publisher	The Japan Society of Mechanical Engineers
publishDate	2019
url	https://doaj.org/article/0d8a7ff9c71a4d69bdbf8acadf9ca780
work_keys_str_mv	AT jinqilyu studyonratchetingofbeamsunderthecombinationofgravityandseismicload AT masakazuichimiya studyonratchetingofbeamsunderthecombinationofgravityandseismicload AT mdabdullahalbari studyonratchetingofbeamsunderthecombinationofgravityandseismicload AT ryunosukesasaki studyonratchetingofbeamsunderthecombinationofgravityandseismicload AT naotokasahara studyonratchetingofbeamsunderthecombinationofgravityandseismicload
_version_	1718407568358899712

Study on ratcheting of beams under the combination of gravity and seismic load

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