Executive Summary : | Current base isolation methods for structural systems are generally not suitable for providing adequate protection against vertical seismic excitation. These isolation systems also need to accommodate large relative horizontal displacement between the foundation and the super-structure during seismic events, thereby compromising their serviceability requirements in many cases. The feasibility of a new base isolation technique for structural applications is being theoretically investigated through the use of meta-material based foundations as part of a DST funded research project (ECR/2016/000614). Various innovative approaches have been adopted in the above mentioned project to effectively incorporate meta-material based seismic isolation systems into structural components and thereby address the limitation of conventional isolation systems.
Experimental validation of three innovative seismic isolation systems would be performed in this project. The three isolation systems have been conceptualized through various studies conducted as a part of the DST funded research project no. ECR/2016/000614. Firstly, small scale experimental studies would be performed to verify a new approach of combining the 1D meta-materials with different periodicity into an isolation system to obtain attenuation zones with low starting frequencies as well as wider band gaps. Secondly, experimental validation of a novel concept of using hollow-shell periodic units with large thickness in isolation systems for structural columns would be carried out to reduce the effect of seismic waves in a cost-effective manner. Thirdly, numerical and experimental studies would be conducted to investigate the effectiveness of meta-material based isolation systems in combination with traditional base isolation systems to utilize the advantages of both systems and overcome the drawbacks of the individual systems.
The use of the above mentioned isolation systems, if found feasible, can greatly reduce the damaging effects of seismic waves on structural members, in both horizontal and vertical directions. Hence, it is necessary to corroborate the functionality and effectiveness of the proposed isolation systems through experimental studies prior to their practical implementation in structural systems. |
Co-PI: | Dr. Manish Kumar Indian Institute Of Technology Bombay, Maharashtra,Iit Po Powai,Maharashtra,Mumbai-400076, Dr. Sumiran Pujari Indian Institute Of Technology Bombay, Maharashtra,Iit Po Powai,Maharashtra,Mumbai-400076 |