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Structures rarely achieve structural symmetry. Even in symmetric structures, the asymmetric position of the structural components tends to produce an effective asymmetric structure. Such an asymmetry even if is small, can produce a torsional response coupled with translational response. In the torsional analysis, the provisions of the seismic norms are based on determining the static eccentricity. In this paper is presented a general way of computing the eccentricity in torsional design. The purpose of this article is to make a comparison of the general rules used to determine the eccentricity and their values. Are taken into account the norms from: Romania, Europe, Japan, Germany and the United States of America.

For the composition and the structural design to lateral loads, the distribution of horizontal lateral forces on vertical structural elements is an important issue, which can become complicated, depending on the considered structural system. In this paper is presented a study regarding the influence of the asymmetry on the response of a mix structure (frame with coupled walls). The structure has 11 floors and is analysed in three different cases of walls positioning, in order to verify their influence on the lateral rigidity and torsional response of the structure.