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 (Ω) 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 Ω 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 Ω 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.
Highlights
As modern cities continue to flourish, there is an increasing need for a variety of building functions
5) The effects of different foundation conditions on the structural seismic responses are weakened by the development of structural inelastic
The aim of this paper is to present a new method to investigate the lateral-torsional coupling behaviours of soil-multistorey structure interaction of torsionally coupled system through the whole process from the elastic stage to inelastic stage under external load
Summary
As modern cities continue to flourish, there is an increasing need for a variety of building functions. The number of irregularly-shaped buildings has increased. In these buildings, the mass center does not coincide with the stiffness center. The inertial force and the resisting force of the building are not collinear when subjected to lateral loads (e.g. earthquakes), and the structure exhibits vibrating characteristics of coupled translation and torsion. Studies have focused on seismic characteristics, the impact factors, evaluation and studies of simplified model of eccentric structures [4,5,6,7]. These studies are assumed that the eccentric structures are supported by a rigid foundation. The interaction effect of the soil and foundation is
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