Evaluation of Earthquake Response Analysis Methods For Low Rise Base Isolated Buildings

Evaluation of Earthquake Response Analysis Methods For Low Rise Base Isolated Buildings

EVALUATION OF EARTHQUAKE RESPONSE ANALYSIS METHODS

FOR LOW-RISE BASE ISOLATED BUILDINGS

ABSTRACT :

The seismic isolation approach is extremely rational approach especially for low-rise and medium-rise buildings with natural periods close to fundamental periods, i.e., buildings that are under the risk of the resonance. This paper deals with available analysis methods determined on a comparative basis for most suitable and realistic approaches, especially for cases where the isolators are provided for the foundations of low-rise and medium-rise buildings. To this end, a brief introduction is followed by the investigations performed for different analysis methods, namely the static equivalent earthquake force analysis, linear response spectrum analysis, linear time history analysis and nonlinear time history analysis. For each analysis method, the comparisons are performed and conclusions are discussed for the total base shear forces, story shear forces at columns and absolute and relative story drifts. It can be concluded, upon assessments on the results of the analyses especially for first three analyses, that they are reasonable and extremely practical. The results obtained from the nonlinear analysis tend to deviate from each other as compared with other methods, mainly because of the facts that its is extremely sensitive to numerous parameters and that such nonlinear parameters used in the calculations are derived from simple static methods. On the other hand, even static equivalent earthquake force analysis yields more correct results especially in designing the isolation systems for the low-rise building. Accordingly, it is more reasonable,

in the course of the design, to perform first static and then linear response spectrum analysis prior linear time history analysis.

World Conference on Earthquake Engineering
October 12-17, 2008, Beijing, China

N. Torunbalci1 and G. Ozpalanlar2
1 Assoc. Professor Dr., Dept. of Structural Engineering , Faculty of Architecture, Istanbul Technical University,
Taskisla, Taksim 34437 Istanbul,Turkey
2 MSc. Civil Eng. BOT Group Sumko Sitesi, K-1Blok 1 Kozyatağı, Kadıkoy Istanbul, Turkey

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