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The equivalent static eccentricities of seismic forces are usually defined by codes with simple expressions of the static eccentricity. This paper presents certain formulae for the exact calculation of these eccentricities on the basis of the dynamic response of a simplified model. From the parametric analysis of such formulae the determinative role of the torsional and lateral stiffness of the system becomes obvious for the correct evaluation of the equivalent static eccentricities. Finally, a proposal is made for the improvement of the static torsional provisions of the current codes.

This paper deals with the problem of evaluating the principal directions under lateral loading in multistorey asymmetric buildings with rigid floor diaphragms. To this purpose a rational criterion is suggested and analytical formulae are developed, with the aid of which the principal directions of these buildings can be determined. The proposed principal directions depend on the vertical distribution of the lateral forces applied at the storey levels, while it is assumed that these forces pass through a vertical loading axis. Several numerical examples are presented which demonstrate the applicability of the proposed methodology. Moreover, the examples verify that the principal directions' properties resulting from the proposed procedure are closer to the principal directions' properties of the single‐storey building's concept than those suggested by other researchers. Copyright © 2007 John Wiley & Sons, Ltd.

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