2102. Inelastic parametric analysis of frequencies and seismic responses of soil-multistorey bidirectional eccentric structure interaction system

Xin-liang Jiang1, Yu-ping Kuang2, Nan Jiang3

1, 2, 3School of Civil Engineering, Tianjin University, Tianjin 300072, China

1, 3Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University,
Tianjin 300072, China

3Corresponding author

E-mail: 1jiangxinliang@126.com, 2kuangyuping8826@163.com, 3jiangnan@tju.edu.cn

Received 23 January 2016; received in revised form 9 May 2016; accepted 28 June 2016

DOI https://doi.org/10.21595/jve.2016.16866

Abstract. This paper presents a parametric study on the lateral-torsional coupling behaviours of soil‑multistorey bidirectional eccentric structure interaction system from elastic stage to nonlinear inelastic stage. A simplified bidirectional eccentric multistorey dual lateral load-resisting model for the superstructure is proposed to conduct this parametric study. Incorporating the inter‑storey restoring force model of the superstructure, the dynamic motion equations and the dynamic stiffness matrix of the soil-multistorey bidirectional eccentric structure interaction system in different loading stages are derived. Based on these, parametric analyses of frequencies and seismic responses for the soil-three storey structure interaction systems from elastic stage to nonlinear inelastic stage are evaluated. Effects of the uncoupled torsion to lateral frequency ratios () of the corresponding fixed base system, the stiffness eccentricities and different soil types on the frequencies and seismic responses are investigated. Results show that the soil can significantly reduce the lateral-torsional coupling effect and the structural seismic response of the soil‑bidirectional eccentric structure interaction system; a smaller  value and larger values of the eccentricities lead to a larger reduction in the lateral-torsional coupling effect of the first order mode in nonlinear inelastic stage; the effects of different foundation conditions on the structural seismic responses are weakened by the development of structural inelastic; after considering the soil-structure interaction, the influences of  and eccentricities on the structural seismic responses are changed. A softer soil-structure interaction system has a more weaken lateral-torsional coupling effect, and its vibration modes in nonlinear inelastic stage are changed compared with the system situated on other soils.

Keywords: bidirectional eccentric structures, soil-structure interaction, lateral-torsional coupling, uncoupled torsion to lateral frequency ratio, eccentricity.

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Cite this article

Jiang Xin‑liang, Kuang Yu‑ping, Jiang Nan Inelastic parametric analysis of frequencies and seismic responses of soil‑multistorey bidirectional eccentric structure interaction system. Journal of Vibroengineering, Vol. 18, Issue 5, 2016, p. 3010‑3036.

 

© JVE International Ltd. Journal of Vibroengineering. Aug 2016, Vol. 18, Issue 5. ISSN 1392-8716