The simplified methods for estimation of the natural vibration periods of buildings were evaluated by\ud
means of three examples of tall buildings. Procedure for determination of the total base shear force\ud
according to SIST EN 1998-1:2005 and some simplified procedures for estimation of the natural\ud
vibration periods of buildings are presented in the theoretical part of the thesis. In the second part of\ud
the thesis, the three examples of multistory buildings are then analyzed using ETABS in order to\ud
compute natural vibration periods according to theoretically adequate procedure. These results were\ud
used as point of comparison. Later on, many different simplified methods were applied in order to\ud
assess natural vibration periods of reinforced concrete buildings, whereas for the steel building, only\ud
the methods prescribed in SIST EN 1998-1:2005 were used. Based on the results of this comparative\ud
study it can be concluded that the simplified procedures provide estimates for natural vibration periods\ud
which are not sufficiently accurate. The simplified period-height relationship should therefore be used\ud
only for the purpose of preliminary analysis or for seismic performance assessment of building stock,\ud
since in the later case structural models of buildings are not available
