Three-dimensional seismic isolation of single-layer spherical lattice shells using magnetorheological negative stiffness dampers

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (20) : 172-182.

ZHUANG Peng1,2,3,YANG Jianing1,ZHANG Guowei1,2,3

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Abstract

Three-dimensional (3D) isolation of lattice shell structures is a vital research focus at present. Previous studies concentrated on passive 3D isolation bearings without adjustable real-time control capacities. To address the issue, magnetorheological negative stiffness dampers (MRNSDs) were combined with prepressed spring devices (PSDs) in parallel to form a vertical isolation bearing (MRNSD-PSD) with an adjustable damping force. Based on an objective of extending natural period in the vertical direction, a set of control strategy and implementation method of MRNSDs were established, which was used to simulate the cyclic behavior of the proposed damping device. A single-layer spherical lattice shell with surrounding columns was used as a prototype structure. A semi-active isolation system with MRNSD-PSDs and two different passive isolation systems were separately used for the target structure to improve its seismic behavior. The seismic responses of the controlled and uncontrolled structures were analyzed via numerical modeling. The simulation results indicate that all the three different isolation systems are effective in mitigating structural responses, whereas the semi-active isolation system provides superior control effects on vertical accelerations and displacements to the passive isolation systems.

Key words

lattice shell structure / three-dimensional isolation / magnetorheological negative stiffness damper / semi-active control / seismic response

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ZHUANG Peng1, 2, 3, YANG Jianing1, ZHANG Guowei1, 2, 3. Three-dimensional seismic isolation of single-layer spherical lattice shells using magnetorheological negative stiffness dampers[J]. Journal of Vibration and Shock, 2024, 43(20): 172-182

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