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Earthquake Engineering


 

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Problems of seismic design
of extended and asymmetric structures

Earthquakes of last decades distinctly demonstrated, that buildings of the same type do not have sufficient earthquake resistance (e.g., buildings with walls made of insufficiently strong materials, frame buildings and others), but those of another type have rather high earthquake resistance (large-panel, monolithic and others). Calculations based on existing codes fail to explain this fact.
 
Main assumptions in existing codes
 
a) a floor is considered to be an absolutely hard disc;
b) an impact upon building is assumed to be constant lengthwise the building;
c) two most disadvantageous directions of a seismic wave are across and lengthwise the building;
d) unified generalized abstract dynamic coefficient * is accepted for any type of earthquakes.

Acceptance of these assumptions allowed to present basic calculation model of a building as a cantilever bar for all constructions without any exclusion irrespective of their dimensions. However, analysis of after-effects of destructive earthquakes of the last decades puts in front of scientists the task of perfection of models mentioned above by bringing new factors into calculations, which affect strength of a building.

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