09-10-2014, 03:54 PM
A stochastic approach based on response spectrum superposition technique has been formulated to determine the lateral-torsional response of torsionally coupled multistoreyed buildings subjected to the earthquake excitations. The eccentricity between the centre of mass and centre of resistance has been assumed to be the main cause of the lateral and torsional response of the building. This approach is quite general as it can estimate the response peaks for all orders with the given level of confidence while accounting for the crosscorrelation between various modes of vibration. By using the above approach, single storey models have been investigated for estimating the dynamic eccentricity values at different floor levels of a multistoreyed building. From these, parametric dependence of the dynamic eccentricity versus static eccentricity relationship has been shown more clearly, and it has been found that the codal provisions for torsional moments need to be thoroughly revised for more conservatism and rationality.