CRITICAL DISCUSSION ON SEISMIC DESIGN CRITERIA FOR CROSS CONCENTRICALLY BRACED FRAMES

Recent studies show that the application of EC8 design procedure for X-CBFs, leads to uneconomical and ineffective structural systems, characterized by massive structural members,  large lateral overstrength  and poor plastic engagement.  In this  paper, the EC8- compliant design procedure is summarized and critically discussed also comparing  the EC8 detailing  rules with those recommended  in US Code. In order to assess the influence of the different  codified  requirements,  a six-storey  residential  building  is selected  as benchmark case  and  alternatively   designed  according  to  both  European  and  US  code.  Nonlinear dynamic analyses are performed and the seismic performances of EC8 and AISC-compliant frames are discussed and compared.

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Silvia Costanzo, Mario D’Aniello, Raffaele Landolfo, Attilio De Martino