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[I]Qiang Zhou & Xilin Lu& Qingmin Wang &Dingguo Feng and Qianfeng Yao, 'DynamicAnalysis On Structures Base-Isolated By ABall System With Restoring Property'. EarthqukeEngineering and Structural Dynamics, Vo!.27, 1998,773-791.[2]Tsung- WuLin&Chao-Chi Hone,' BaselsolationByFree RollingRods under Basement", EarthqukeEngineering and Structural VoI.22, 1993,261-273.[3] Tsung-Wu Lin&Ching -ChamChem&Chao-ChiHone, 'Experimental Study Of Base ByFree RollingRods "Earthquke Engiineering And Structural, Vol.24,1995,1645-1650.

Islamic Azad Civil Engineering Journal 3

Using Mushroom Shaped Basements under Buildings asIsolator in Order To Reduce. the Earthquake Effect on

Structures

Majid BargianDepartment of Civil Engineering, Tabriz University

Ali Bairami Shahabi

Islamic Azad University, Shabestar Branchalibairami@yahoo.com

A new base isolation method for reducing the destructive effect ofearthquake is proposed in this method mushroom shaped basements are usedunder structures as base isolation. These basements have spherical surface andare located on foundations. Basements have pinned arms that are connected.When the length of the arm is less then the radius of spherical surface, the actionof them is similar to a spring. In other words, when a displacement in a structurehappens .a returning force is supplied to the structure and the stability of thestructure is guaranteed .The specification of these springs is so that their stiffness

can easily be set- As the stiffness is settable therefore the stiffness can be set in away that firstly, the force applied to the structure will be acceptable, themaximum displacement will not exceed allowable limit.

In this research the basements together with the structure were mode led asa one-degree freedom system of mass, spring and damper.

Key Words: Vibration Separation, Passive Control, Damper, Mushroom - likedbases