All base isolated models are characterized as regular in plan, which is an indicator of the advantages of the base isolated structures in case of irregularity in plan. First distribution is most conservative, while the fourth is most flexible. By comparing the results obtained for different lateral load distribution it can be noted that from the results obtained by one method, the structure can be defined as plan regular, while from another as plan irregular. By increasing of irregularity degree, the ratio between the eccentricity obtained for the first and for the fourth distribution, decreases. The value of the torsional radius is inversely proportional to the level of irregularity. Four procedures for determination of centre of stiffness and torsional radius, which differ among themselves according to the distribution of the lateral loading over height are presented. Original Title: Metode za određivanja centra krutosti i torzijskog polumjera višekatnicaĪbstract: In order to compare the different approach for the calculation of eccentricity of centre of stiffness and centre of mass and torsional radius, four different five storey buildings with different degree of plan irregularity were created. Title: Methods for determination of centre of stiffness and torsional radius in multi-storey buildings
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