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Shape factor correction in optimum design of elastomeric laminated seismic isolators

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Author: 
Amir Abbaszadeh
Abstract: 

This study examines the stiffness of different (in terms of diameter and layer thickness) seismic isolators in an effort to compare the vertical stiffness of isolator systems obtained from construction code formulas with that obtained from models simulated via ABAQUS. To this end, 16 different geometric layered (laminated) isolator models were generated. The results showed that increasing the isolator radius at different rubber layer thicknesses, and consequently, increasing the isolator shape factor would lead to an increase in vertical stiffness. In addition, increasing the thickness of the isolation layer increased the slope of the diagram, which emphasized the fact that increasing radius was more effective in isolator systems with greater thickness. The maximum shear stress developed in the rubber layer under vertical pressure was also studied by analyzing a rubber layer which assumed only circular and rectangular shapes. This was done by adjusting the rubber layer dimensions to produce shape factors of 5, 20, and 30. The results showed that it was necessary to introduce another factor for correcting the isolator shape factor. A correction factor of unity works only for rubber layers with lower shape factors. For higher shape factors, the correction factor can be applied to the isolator as a reduction coefficient (factor).

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