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Available from: Michele Betti, Sep 29, 2015
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    ABSTRACT: The paper presents an accurate method to quantify the behavior factor of structural systems, by means of a full probabilistic evaluation of the involved quantities. The criteria of the probabilistic evaluation of seismic capacity are based on Monte Carlo method for which hundreds of dynamic analyses are performed with different material properties and seismic actions. The ground motions are described by artificial accelerograms compatible with the response spectrum assumed in Eurocode 8. The assessment of the design rules of the Eurocode is made with reference to two reinforced concrete frames, one representing a cast-in-situ structure, the other representing a precast structure, both analyzed in four levels of sway stiffness. The results are expressed in terms of frequency distribution curves of the overstrength ratio between actual and design seismic capacity. The results show that cast-in-situ and precast frames have the same seismic behavior with respect to ductility resources and ultimate capacity. The experimental verification of these theoretical results is also found by means of pseudodynamic tests on full-scale cast-in-situ and precast prototypes. The results of the tests are presented and compared with the results of a numerical simulation. The good agreement between numerical and experimental results confirms the reliability of the theoretical model and, with it, the results of the statistical analysis too.
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    ABSTRACT: A comprehensive, though relatively simple, non-linear method for the seismic damage analysis of reinforced concrete buildings (the N2 method) has been elaborated. The basic features of the method are: the use of two separate mathematical models, application of the response spectrum approach and of the non-linear static analysis, and the choice of a damage model which includes cumulative damage. The method yields results of reasonable accuracy provided that the structure oscillates predominantly in the first mode. Three variants of a seven-storey building have been used as illustrative examples for the application of the method. Four different types of the analysis, with different degrees of sophistication, have been performed in order to estimate the influence of several assumptions and approximations used in the N2 method.
    Earthquake Engineering & Structural Dynamics 01/1996; 25(1):31 - 46. DOI:10.1002/(SICI)1096-9845(199601)25:1<31::AID-EQE534>3.0.CO;2-V · 2.31 Impact Factor