a new relationship to determine fundamental natural period of vibration for irregular buildings in height using artificial neural network

One of the most important structural features is fundamental vibration period which depends significantly on the inherent characteristics of structures. seismic codes and some researchers estimate experimentally and mathematically fundamental vibration period using the number of stories or the overall height of the building. the consequences of evaluating the various relationships have been resulted based on structural height, mass, stiffness and number of stories. as the overall height and the number of stories do not make difference between regular and irregular structures, so it seems that mass and stiffness of each story is so important in zone of building vibration period. considering the importance of irregular buildings, a new relationship proposed to determine fundamental natural period of vibration for elastic regular and irregular buildings in height using artificial neural network. the accuracy of the proposed relationship is perfectly validated and confirmed by numerical calibrations and matrix analyses.