Application of one-dimensional periodic layers with elastomeric seismic isolators for three-dimensional isolation

被引:0
|
作者
Kumawat, Sanjay R. [1 ]
Kumar, Manish [1 ]
Laskar, Arghadeep [1 ]
机构
[1] Indian Inst Technol, Powai, India
关键词
Three-dimensional; Periodic Materials; Bandgaps; Seismic; Elastomeric; Isolation; ISOLATION SYSTEM; TRANSFORMERS;
D O I
10.1016/j.istruc.2024.107719
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Three-dimensional (3D) seismic isolation is an appealing idea to protect structures and their components from earthquake-induced horizontal and vertical ground motions. Past attempts to develop 3D isolation systems were ineffective due to their complexity and reliability issues. One-dimensional periodic material-based isolation systems (1D-PIS) have been extensively researched for applications as raft foundations due to their simple and construction-friendly unit cell designs. These systems aim to attenuate seismic excitations in both horizontal and vertical directions. However, the effectiveness of 1D-PIS in mitigating 3D excitations may be limited due to the potential mismatch between the frequency content of horizontal and vertical vibrations. The present study proposes to combine a conventional horizontal isolation system with a 1D-PIS in the vertical direction to achieve a simple, passive, and efficient three-dimensional isolation system for structures and components. The 1D-PIS is strengthened by incorporating steel shims within the rubber layers and implementing steel casings at its periphery, enabling its utilization as an isolated system. Small-scale experimental and numerical investigations were conducted on strengthened 1D-PIS to study its isolation characteristics in the vertical directions. The study reveals that infinite boundary conditions required for the efficacy of 1D-PIS were achieved through lateral restraint provided by steel shims and steel casings. Notably, the individual isolation characteristics of the conventional and the 1D-PIS are not compromised in the combined isolation system. Nonlinear time history analysis on a prototype combined isolation system confirms its effectiveness in attenuating the seismic response under simultaneous horizontal and vertical ground motions.
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页数:14
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