ANALYSIS OF CRITERION FOR TORSIONAL IRREGULARITYOF SEISMIC STRUCTURES

摘要

The torsion effects caused by irregularity of plan layout of seismic structures have been emphasized forseismic design in some codes. When and how to consider torsion effects is depended on the criterion andrelative regulations for torsional irregularity. There are some differences between the criterions from onecode to another. In this paper, the differences between the codes of China, USA and Europe are studied.Through analyzing series of structures with eccentricity in one and two directions, the corelation betweentorsion effects and the criterion adopted by the different codes is obtained. According to the analysisresults, it can be indicated that torsion effects has no dependency relation with the criterion adopted by thecodes mentioned above and some regulations in the code are not reasonable.