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  • A weakness of the static method as implemented by the Italian seismic Code

    The static method of seismic analysis proposed by the Italian code of practice can lead to non- conservative design. This may happen when the rigorous value of the fundamental period of the structure is adopted instead of the approximate one given by the code.The present paper shows that in the presence of eccentricity between the stiffness center and the mass center of the building floors, the static method can under-evaluate the maximum seismic effects by more than 25%. Appropriate changes in the code should be introduced in order to bring the static method to the safe side. Some possible improvements are discusses in the present paper.

    For this paper is available an extended abstract after the text in Italian

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  • Linear Static Analysis and Eccentricity

    It is shown how the lateral force method of analysis contemplated by the Italian and European Codes is not suitable for describing the behavior of a building subject to seismic action, even under perfect structure regularity. The deficiency of the method is quantified, and the reasons behind it explained, namely the way the eccentricity is taken into account. Finally, an improved lateral force method is proposed, which is as simple as the current one, and at the same time able to fill the gap.

    Available in Italian only.