Title : EFFECT OF PARAMETERS ON PERIOD OF VIBRATION IN SEISMIC ANALYSIS
Authors : Prakash Sangamnerkar M. Tech. (Struct), Dr. S. K. Dubey Ph. D.
Publication : 8 - 10, October 2015
Volume : 2
Pages :
Price : 250
Abstract : Fundamental natural period of vibration T of the building in seismic analysis of the building is an important parameter for evaluation of seismic base shear. Empirical equations given in most of the seismic code for the evaluation of the fundamental period of a framed structure, primarily as a function of height or a function of number of storeys, and do not consider the effect of stiffness of the structure, base dimensions of the structure, number of panels in both the directions.The fundamental period can be evaluated using simplified expressions found in codes, which are based on earthquake recordings on existing buildings, laboratory tests, numerical or analytical computations. These technical codes provide expressions which depend on basic parameters such as building height or number of storeys. Fundamental period of the buildings predicted by these expressions are extensively used in practice, although, height alone is inadequate to explain period variability and still there is a further scope to improve these equations. The aim of this study is to find the effects of parameters like building base width in both the directions, stiffness of the structure, length of bay etc. to predict the fundamental period of vibration of reinforced concrete buildings with moment resisting frames. A few examples of dynamic analysis are presented in this study in order to show that the base dimensions and stiffness of the structure should also be incorporated in the formula to evaluate period of vibration.