ABSTRACT
ABSTRACT: Nonlinear methods of analysis for seismic vulnerability assessment of existing structures are attracting increasing attention for their capacity to predict the actual seismic behavior better than linear methods. Their inclusion in modern design codes such as Euro-code 8 is a major boost for their use in practical applications. Recent years have also seen steady advances in the modeling capabilities of reinforced concrete frames, particularly in the field of beam and column behavior. Advanced frame modeling tools are included in both research and commercial codes. As research and practicing engineers start applying nonlinear methods to real problems, questions arise regarding the application of the design code-provided procedures and the selection of the appropriate structural model given the objective limitations of the frame modeling capabilities today available. The scope of this paper is to discuss some of the issues still open regarding the applications of the nonlinear methods of analysis to reinforced concrete structures, with the firm belief that an open discussion on these methods, their advantages and limitations will open the way to a more widespread use of advanced and more accurate methods of analysis.
