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Journal of Applied Sciences
  Year: 2009 | Volume: 9 | Issue: 6 | Page No.: 1082-1089
DOI: 10.3923/jas.2009.1082.1089
 
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Performance of Asymmetric Multistory Shear Buildings with Different Strength Distributions

A. Aziminejad and A.S. Moghadam

Abstract:
The experience from the performance of buildings during past earthquakes has shown that asymmetric buildings often sustain more extensive damages as compared to the symmetric buildings. Performance of an asymmetric building can be quantified by responses such as rotation of the floor, the maximum drift of flexible and stiff edges of the building or the ductility demand of the elements on those edges. In this study, the nonlinear dynamic behaviour of a set of five-story asymmetric buildings with different strength distribution is studied to investigate the effect of different strength distribution strategies. To show different responses such as drift, ductility and plastic hinge rotation of the models, fragility curves are used. The results show that among torsionally rigid models studied here, models with a smaller strength eccentricity perform better. However, in general, the optimum strength eccentricity is shown to be a function of the selected damage index. For example, if damage index is represented by the inter-story drift ratio, the appropriate strength distribution is the configuration with a small strength eccentricity. On the other hand, if damage function is represented by ductility demand of the elements, the appropriate strength distribution is the one with strength center between the centers of mass and rigidity. By identifying the more exact configurations of centers of mass and rigidity, they can be utilized as a proper way for reduction of adverse torsional effects in design or rehabilitation of asymmetric buildings. These configurations can also be used as a new reference point for identifying acceptable limits of eccentricity.
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How to cite this article:

A. Aziminejad and A.S. Moghadam, 2009. Performance of Asymmetric Multistory Shear Buildings with Different Strength Distributions. Journal of Applied Sciences, 9: 1082-1089.

DOI: 10.3923/jas.2009.1082.1089

URL: https://scialert.net/abstract/?doi=jas.2009.1082.1089

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