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