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Open Access Research Article

Evaluating the Effect of Support Rotation on the Buckling Modes and Critical Displacement of Elastomeric Base Isolators

Ehsan Kazeminezhad1*, Mohammad Taghi Kazemi2 and Seyed Mohammad Mirhosseini33

1,3Department of Civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran

2Department of Civil Engineering, Sharif University of Technology, Iran

Corresponding Author

Received Date: December 20, 2019;  Published Date: January 09, 2020


Base isolation is one of the ways to stabilize structures against earthquake. In general, two types of system for isolate are used: laminated rubber bearing and lead rubber bearing. In this paper, the laminated rubber bearing is used. These isolators are made of bonded steel and rubber sheets with vulcanization. One of the most important factors for their design is stability because they can cause damage to the upper structures due to instability. For stability check the buckling load calculated based on the theory relation and compared with the finite element method. The support rotation causes a significant reduction in the buckling load and critical displacement of the isolators. In this research, the buckling load of square and circular isolator is calculated and shows that the buckling load of square isolator is higher than the circular ones and also rotation decreases the critical displacement.

Keywords: Laminated rubber bearing; Buckling load; Critical displacement; Circular bearing; Square bearing

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