Impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities

Buildings subjected to torsional effect may result to the floors of the building not only translate laterally but also rotate vertically. Torsional effects may significantly modify the seismic response of buildings, and even cause severe damage or collapse of structures. The current practices in ear...

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Main Authors:	A., Rashidi, T. A., Majid, A., Faisal, M. I., Adiyanto
Format:	Conference or Workshop Item
Language:	English
Published:	IOP Publishing 2019
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/24669/ http://umpir.ump.edu.my/id/eprint/24669/ http://umpir.ump.edu.my/id/eprint/24669/1/25%20Impact%20of%20strong%20repeated%20ground%20excitation%20to%20the%20on-plan%20rotation%20of%20asymmetric%20building%20with%20various%20strength.pdf

id	ump-24669
recordtype	eprints
spelling	ump-246692019-04-02T03:22:36Z http://umpir.ump.edu.my/id/eprint/24669/ Impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities A., Rashidi T. A., Majid A., Faisal M. I., Adiyanto TA Engineering (General). Civil engineering (General) Buildings subjected to torsional effect may result to the floors of the building not only translate laterally but also rotate vertically. Torsional effects may significantly modify the seismic response of buildings, and even cause severe damage or collapse of structures. The current practices in earthquake design is to apply single earthquake on structure during modelling and analysis. However, in real earthquake occurrence, the earthquakes normally occurred repeatedly after the first event. This phenomenon can affect the stiffness and strength of the structural system especially for repeated strong motions. With greater damage expected and lack of time, any rehabilitation action is impractical. Slab rotation, a major response parameter to represent the severity of the torsional response of eccentric systems, is considered. The centre of strength (CR) and centre of stiffness (CS), as two interdependent and important factors to the torsional response of buildings, are investigated via eighty positions of strength eccentricities (er) and stiffness eccentricities (es). Hence, this paper presents the torsional behaviour of a single storey, three-dimensional asymmetric building under the excitation of single and repeated strong ground motions. These motions are applied in the z-direction and analysed for elastic and inelastic conditions. The results are interpreted based on two position models. Position Model A concludes that the effectiveness of CS reduces gradually until CS ratio (es/bz) ≤0.2; thereafter effectiveness of CR increases to cause elastic slab rotation. With repeated ground motion, the magnitude of inelastic rotation is increased; however es/bz ≤0.2 is maintained showing effectiveness of stiffness eccentricity irrespective of nature of ground motion. Position Model B shows that slab rotation is affected by repeated ground motion. Elastic/inelastic analysis under repeated ground motion must be conducted in oppose to current practice, so that the designed structure can undertake the elastic/inelastic demand; especially for the lower CR ratio values. IOP Publishing 2019 Conference or Workshop Item PeerReviewed pdf en cc_by http://umpir.ump.edu.my/id/eprint/24669/1/25%20Impact%20of%20strong%20repeated%20ground%20excitation%20to%20the%20on-plan%20rotation%20of%20asymmetric%20building%20with%20various%20strength.pdf A., Rashidi and T. A., Majid and A., Faisal and M. I., Adiyanto (2019) Impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities. In: IOP Conference Series: Earth and Environmental Science, National Colloquium on Wind and Earthquake Engineering, 17-18 August 2018 , Kuantan, Pahang, Malaysia. pp. 1-10., 244 (012023). ISSN 1755-1315 https://doi.org/10.1088/1755-1315/244/1/012023
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) A., Rashidi T. A., Majid A., Faisal M. I., Adiyanto Impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities
description	Buildings subjected to torsional effect may result to the floors of the building not only translate laterally but also rotate vertically. Torsional effects may significantly modify the seismic response of buildings, and even cause severe damage or collapse of structures. The current practices in earthquake design is to apply single earthquake on structure during modelling and analysis. However, in real earthquake occurrence, the earthquakes normally occurred repeatedly after the first event. This phenomenon can affect the stiffness and strength of the structural system especially for repeated strong motions. With greater damage expected and lack of time, any rehabilitation action is impractical. Slab rotation, a major response parameter to represent the severity of the torsional response of eccentric systems, is considered. The centre of strength (CR) and centre of stiffness (CS), as two interdependent and important factors to the torsional response of buildings, are investigated via eighty positions of strength eccentricities (er) and stiffness eccentricities (es). Hence, this paper presents the torsional behaviour of a single storey, three-dimensional asymmetric building under the excitation of single and repeated strong ground motions. These motions are applied in the z-direction and analysed for elastic and inelastic conditions. The results are interpreted based on two position models. Position Model A concludes that the effectiveness of CS reduces gradually until CS ratio (es/bz) ≤0.2; thereafter effectiveness of CR increases to cause elastic slab rotation. With repeated ground motion, the magnitude of inelastic rotation is increased; however es/bz ≤0.2 is maintained showing effectiveness of stiffness eccentricity irrespective of nature of ground motion. Position Model B shows that slab rotation is affected by repeated ground motion. Elastic/inelastic analysis under repeated ground motion must be conducted in oppose to current practice, so that the designed structure can undertake the elastic/inelastic demand; especially for the lower CR ratio values.
format	Conference or Workshop Item
author	A., Rashidi T. A., Majid A., Faisal M. I., Adiyanto
author_facet	A., Rashidi T. A., Majid A., Faisal M. I., Adiyanto
author_sort	A., Rashidi
title	Impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities
title_short	Impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities
title_full	Impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities
title_fullStr	Impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities
title_full_unstemmed	Impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities
title_sort	impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities
publisher	IOP Publishing
publishDate	2019
url	http://umpir.ump.edu.my/id/eprint/24669/ http://umpir.ump.edu.my/id/eprint/24669/ http://umpir.ump.edu.my/id/eprint/24669/1/25%20Impact%20of%20strong%20repeated%20ground%20excitation%20to%20the%20on-plan%20rotation%20of%20asymmetric%20building%20with%20various%20strength.pdf
first_indexed	2023-09-18T22:37:28Z
last_indexed	2023-09-18T22:37:28Z
_version_	1777416692044922880

Impact of strong repeated ground excitation to the on-plan rotation of asymmetric building with various strength and stiffness eccentricities

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