American Society of Civil Engineers


Comparative Study of Base Isolation Systems


by Lin Su, (Res. Asst., Dept. of Mech. and Industrial Engrg., Clarkson Univ., Potsdam, NY 13676), Goodarz Ahmadi, (Prof., Dept. of Mech. and Industrial Engrg., Clarkson Univ., Potsdam, NY 13676), and Iradj G. Tadjbakhsh, (Prof., Dept. of Civ. Engrg., Rensselaer Polytechnic Inst., Troy, NY 12181)

Journal of Engineering Mechanics, Vol. 115, No. 9, September 1989, pp. 1976-1992, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9399(1989)115:9(1976))

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Document type: Journal Paper
Abstract: A comparative study of effectiveness of various base isolators is carried out. These include the laminated rubber bearing with and without lead plug and several frictional base isolation systems. The structure is modeled as a rigid mass and the accelerograms of the N00W component of the El Centro 1940 earthquake and the N90W component of the Mexico City 1985 earthquake are used. The performances of different base isolation devices under a variety of conditions are evaluated and compared. Combining the desirable features of various systems, a new design for a friction base isolator is also developed and its performance is studied. It is shown that, under design conditions, all base isolators can significantly reduce the acceleration transmitted to the superstructure.


ASCE Subject Headings:
Earthquakes
Passive control
Response spectra
Base isolation
Friction