Soil-Structure Interaction Effect on Active Control of Multi-Story Buildings under Earthquake Loads


A direct output feedback control scheme was recently proposed by the authors for single-story building structures resting on flexible soil body. In this paper, the control scheme is extended to mitigate the seismic responses of multi-story buildings. Soil-structure interaction is taken into account in two parts: input at the soil-structure interface/foundation and control algorithm. The former reflects the effect on ground motions and is monitored in real time with accelerometers at foundation. The latter includes the effect on the dynamic characteristics of structures, which is formulated by modifying the classical linear quadratic regulator based on the fundamental mode shape of the soil-structure system. Numerical results on the study of a 1/4 -scale three-story structure, supported by a viscoelastic half-space of soil mass, have demonstrated that the proposed algorithm is robust and very effective in suppressing the earthquake-induced vibration in building structures even supported on a flexible soil mass. Parametric studies are performed to understand how soil damping and flexibility affect the effectiveness of active tendon control. The selection of weighting matrix and effect of soil property uncertainty are investigated in detail for practical applications.

Meeting Name

US-Korea Worshop on New Frontier in Infrastructural/Seismic Engineering (1999: Aug. 24-25, Seoul, South Korea)


Civil, Architectural and Environmental Engineering

Keywords and Phrases

Accelerometers; Algorithms; Dynamic Response; Earthquake Effects; Feedback Control; Foundations; Robustness (Control Systems); Seismic Waves; Tall Buildings; Vibrations (Mechanical); Ground Motions; Linear Quadratic Regulator; Multistory Buildings; Seismic Responses; Soil Damping; Soil Structure Interactions

International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version


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© 2001 Techno Press, All rights reserved.

Publication Date

01 Aug 2001