Abstract
Analysis, monitoring and control of vibration and displacement is the prime concern for structural engineers during any seismic activity. This paper presents the design, development and seismic performance of new and innovative visco-elastic links made by using ’ply’ of old & used radial rubber tyres (co-polymer of styrene butadiene rubber) coupled with interlinked concrete blocks of grade M-20. The study is conceptualized on frictional as well as viscous damping. The whole system is integrated to restrict translation and rotation of the concrete blocks during the extreme earthquake forces. The system is conceptualized on the principle of capacity based design by keeping the yielding capacity of visco-elastic links lower in comparison to concrete blocks. Full scale models are tested and analyzed on shake table and shock table under artificial earthquake excitations. Three shocks with the base acceleration ranging between 0.6g to 2.5g are applied under shock table test. Same type of model is tested on shake table also corresponding to an artificial accelerogram compatible with design spectrum as per IS: 1893 (Part 1): 2002 considering Design Basis Earthquake (DBE) and Maximum Considered Earthquake (MCE) in zone v (for soft soil condition). Effective peak ground acceleration of 0.18g &0.36g is used as the base excitation in horizontal direction and its 2/3 is considered for its vertical motion. A high speed camera with the capturing capacity of 1000 frames per second is used for the analysis of the results and various parameters. A significant performance of inter-linked block masonry system is endorsed under both types of testing. The concept of block masonry with visco-elastic link is successful since the energy is completely released through yielding of links at the bottom portion of the model and the top of the model remains intact, even not a single block of parapet wall under shock table test is displaced from its original undamaged position.
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