strutture in c.a.

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    • Il cambiamento di scala delle strutture per la verifica sismica su tavola vibrante: un telaio in c.a. progettato per carichi verticali

    Igor Lanese, Francesco Marazzi, Roberto Nascimbene

    The work presented here is one of the fundamental phases of a research programme on seismic evaluation of existing buildings, funded by the Department of Civil Protection and developed at the European Centre for Training and Research in Earthquake Engineering (Eucentre). The present article contains a brief summary of the general theory on scaling: this concepts are then specialised for RC structures to be tested on shaking tables. These ideas are finally applied to the numerical model of the studied building and actually under testing on the Eucentre shaking table.

    This paper is available in Italian only.

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    • Influenza delle Tamponature sulla statica dei telai in c.a. in zona sismica

    Dora Foti, Massimiliano Borgia

    This paper describes a model able to evaluate the effect of masonry panels on reinforced concrete frames subjected to a seismic action. The panel is modelled as an equivalent diagonal element with a bilinear constitutive relation. The efficacy of the model is verified with an hysteretic model which considers some fundamental characteristics of masonry subjected to a seismic action (transitory phase between elastic and elasto-plastic behaviour, stiffness and strength decay, reduction of the hysteresis cycles due to the opening and closing of the cracks). This study shows that the presence of masonry panels causes a different distribution of the seismic action that usually concentrates in the lower floors (with accumulation of the damage in these levels) and the whole structure keeps in the elastic field.

    This paper is available in Italian only.