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Applicant:
Indian Institute of Technology (IIT) Roorkee 
Title:
Sliding mass floor system for seismic response control 
Inventor(s):
Manish Shrikhande 
Applicant:
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2018-08-20 
Application Number:
201811031019 
Applied at:
India 
Entered by:
Indian Institute of Technology (IIT) Roorkee 
Abstract:
A sliding mass floor system is designed and developed to control the seismic response of structures. A number of small mass units, called secondary system, are arranged on a floor with suitable spring attachments to the anchor blocks driving reaction from the floor. The total mass of these small mass units is kept around 10% of the seismic mass of the floor and the spring stiffness is kept so as to have the natural frequency of the smaller mass-spring oscillators in the range of 0.5 to 0.9 times the natural frequency of the mode of vibration of the structure which is required to be controlled at that floor. The interface between the smaller masses and the structural floor can be prepared with suitable interface material to have desirable coefficient of friction in the range of 0.2 to 0.4. The intermediate gaps between the anchor blocks for smaller mass-spring oscillators is filled up by suitable packing material and the entire assembly is covered by a sheet of high tenacity material like ultra high molecular weight poly ethylene (UHMWPE), or similar material. A suitable flooring material can be laid over the UHMWPE sheet. During the earthquake excitation, the secondary systems are set into vibration much earlier than the main structure owing to smaller inertia and these vibrating masses exert a restraining force on the main structure causing a reduction in the vibration of main structure. A reduction in seismic response of main structure by approximately 50% has been observed under test conditions for the maximum considered earthquake (MCE) for the most severe zone (Zone-V) of India. The proposed system can also be used for retrofitting of existing structures without any compromise on the functional requirements and enhance seismic resilience of structures at a much lower cost. 

 
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