A Soil-Dependent Approach for the Design of Novel Negative Stiffness Seismic Protection Devices

Applied Sciences

Ioannis A. Antoniadis¹  Konstantinos A. Kapasakalis²  Evangelos J. Sapountzakis² 

[1] Dynamics and Structures Laboratory, School of Mechanical Engineering, Zografou Campus,National Technical University of Athens, GR-157 80 Athens, Greece;Institute of Structural Analysis and Antiseismic Research, School of Civil Engineering,Zografou Campus, National Technical University of Athens, GR-157 80 Athens, Greece;

关键词: base isolation;    building structures;    seismic protection;    negative stiffness;    damping;    vibration control;   

DOI  :  10.3390/app11146295

来源: DOAJ

【 摘 要 】

Conventional base isolation (BI) techniques require a great reduction in the fundamental frequency of the system in order to mitigate the structural dynamic responses due to earthquake excitations. However, the resulting base displacements are large and can cause utility connection problems, rendering BI inadequate for retrofitting. This paper proposes a vibration control system (VCS) that can be used as a supplement to the conventional BI to increase the effective damping, and thus reduce the required base displacements. A novel passive negative stiffness (NS)-based vibration absorber, based on the KDamper, is implemented in parallel to a BI. The design of the VCS follows a constrained optimization approach that accounts for geometrical and manufacturing limitations. The NS is realized with a realistic displacement-dependent mechanism that generates controlled NS. The VCS is designed for various soil-types in order to determine its effectiveness and soil-structure-interaction (SSI) effects are accounted with respect to the soil-type. The earthquake excitation input is selected according to the EC8 by generating a database of artificial accelerograms for each ground type. Finally, the VCS is compared to a conventional BI, and based on the numerical results obtained, the VCS is an effective alternative to BI and a possible retrofitting option.

【 授权许可】

Unknown