Evaluation of Laminated Hollow Circular Elastomeric Rubber Bearing

Abstract eng:
This paper evaluates the behavior and performance of laminated hollow circular elastomeric rubber bearings (HRB) and compares them to solid circular elastomeric rubber bearing (SRB). This research intend to develop new model of elastomeric rubber bearing to obtain more lengthens flexibility of fundamental period of elastomeric rubber bearing; the hollow base isolator. Finite element models were constructed and analyzed to find the mechanical behavior of the rubber bearing. Then, the confirmation towards specification for design, manufacturing and testing of isolation devices must be established. The study included experimental investigation of the hollow rubber bearing under cyclic loading test to evaluate the lateral stiffness and equivalent damping ratio of the isolator. Results from this limited study showed that steel stress and strain in SRB greater than steel stress in HRB but still below from allowable stress design value. On the other hand, stress of rubber in SRB is less than rubber stressed in HRB but still below from allowable design stress of rubber. Results from cyclic loading test showed that even though HRB has effective stiffness less than SRB, but HRB has damping ratio better than SRB. It is because event thought HRB has dissipated energy less than SRB, but the elastic strain energy of SRB more solid than HRB that make the damping ratio of SRB less than HRB.

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