Special Issues

  • Special Issues

    • SPECIAL ISSUE: SEISMIC VULNERABILITY OF STRUCTURES AND INFRASTRUCTURES PART-I

    Seismic engineering is constantly looking for new strategies and methods that provide designers with the opportunity to get more and more efficient solutions both from the performance and from the economic point of view. In this context, the scientific community is called not to miss its support and to face the new challenges coming from the observation of the damage caused by the recent earthquakes. This Special Issue of “Ingegneria Sismica” collects some works focusing the theme of the seismic vulnerability, some of them specifically refer to mitigation strategies while others address modeling strategies. Obviously, for the multiplicity of aspects involving the theme of “seismic vulnerability”, only a few issues have been discussed. In particular, some works deal with the theme of base isolation from the point of view of design and seismic reliability, others are focused on the theme of structural robustness considered as a further goal of seismic design. Further papers are deepening the problems of interaction between frames and masonry infills, providing simplified modeling strategies, suggesting criteria to reduce interaction effects, but above all by providing methods for the analysis of combined in-plane / out-of-plane behavior. The themes related to modeling are also addressed with particular care. Other papers in fact face the issues of model uncertainty and of the reliability of constitutive laws for normal and high strength confined concrete, being the latter of fundamental importance for the assessment of the rotational capacity of reinforced concrete structural elements under seismic actions. Moreover, the problem of the reliability of seismic vulnerability assessment methods is also discussed, with particular reference to multimodal “pushover” analysis. This Special Issues is composed of 10 paper produced by 29 authors, to whom we would like to address a special thank for the effort made during the editorial phases. Finally, the Guest Editors, Paolo Castaldo, Liborio Cavaleri e Fabio Di Trapani, wish to thank Prof. Gianmario Benzoni and Prof. Rosario Montuori for this opportunity and for their assistance.

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  • Special Issues

    • PREFACE

    Rosario Montuori, Francesco Fabbrocino

    Dear Readers,
    this special issue comprises selected papers presented at the XXV edition of “Italian Steel Days” held in Salerno on October 1-2, 2015. This conference represents the place where Italian researchers present their results and development activities in the field of Steel Structures.
    Common papers’ emphasis is about the structural performance under seismic conditions. The Guest Editors, Rosario Montuori and Francesco Fabbrocino, wishes to thank Dr. Gianmario Benzoni for this opportunity and for his assistance.

     

  • Special Issues

    • METAL SHEAR PANELS FOR SEISMIC PROTECTION OF BUILDINGS: RECENT FINDINGS AND PERSPECTIVES

    Gianfranco De Matteis, Giuseppe Brando

    SUMMARY: This paper describes recent experimental researches carried out on metal shear panels to be employed as dampers for seismic protection of new and existing buildings.
    Three typologies of shear panels are presented, which have been conceived with different strategies to mitigate the detrimental effects provoked by buckling phenomena.
    For each solution, experimental results are provided together with design issues. Also, some remarks on the technological aspects of the devices are highlighted in order to limit the adoption of bad details that could jeopardize the structural performance of the system. In the whole, the obtained outcomes provide interesting information opening new frontiers in the field of research on dissipative metal shear panels.

  • Special Issues

    • APPRAISAL OF SEISMIC DESIGN CRITERIA FOR CONCENTRIC BRACING STEEL STRUCTURES ACCORDING TO ITALIAN AND EUROPEAN CODES

    Beatrice Faggiano, Antonio Formisano, Carmine Castaldo, Luigi Fiorino, Vincenzo Macillo, Federico M. Mazzolani

    SUMMARY: The critical review of design methods provided by the Italian codes for constructions NTC2008, in agreement with the European seismic code (EC8), for steel Concentrically Braced Frames (CBF) with X and chevron (or inverted V) diagonals, has the aim at providing more efficient design criteria able to ensure adequate safety levels under seism. As reference case studies, common structural configurations of CBF are designed according to NTC2008, by both Linear Static and Dynamic analyses. The purpose is identifying the weaknesses in the design criteria, with particular reference to both the applicability of the proposed procedures and the actual possibility to size braces and connected structural members, like beams and columns. The critical issues in the design process are evidenced. A discussion on the obtained results has allowed to point out the pros and cons of the current design approach and to propose some enhanced design criteria.

  • Special Issues

    • PRELIMINARY ANALYSIS ON THE INFLUENCE OF THE LINK CONFIGURATION ON SEISMIC PERFORMANCES OF MRF-EBF DUAL SYSTEMS DESIGNED BY TPMC

    Rosario Montuori, Elide Nastri, Vincenzo Piluso

    SUMMARY: The work is devoted to the evaluation of the influence of link configuration on seismic performances of Moment Resisting Frames-Eccentrically Braced Frames dual systems (MRF-EBF dual systems) designed by means of Theory of Plastic Mechanism Control (TPMC). As it is known TPMC assures the development of a collapse mechanism of global type, therefore, the seismic performances evaluated by means of IDA analyses, are affected only by the structural scheme configuration. However, in this paper only a 5 bays structure with 4, 6 and 8 storeys are reported, so that, the work configures as a preliminary evaluation. Additional analyses on different structural schemes with different number of bays will be the natural development of the work herein presented.

  • Special Issues

    • THE NON-LINEAR RESPONSE OF STEEL-CONCRETE COMPOSITE JOINTS

    Maria Rosaria Pecce

    SUMMARY: In this paper the experimental results of two beam-column composite connections (one welded and the other bolted) tested under cyclic loading are presented and discussed. The two full-scale specimens were designed as sub-assemblages of a frame to localize the damage at the end of the composite beam in respect of the capacity design, therefore the joint contributed to the deformability of the system essentially in the elastic field. The detail in the area around the column were realized according to the provisions of Eurocode 8 to assure the strength hierarchy by the local mechanisms of the concrete slab. The results highlight the main role of the composite beam in terms of  ductility; the rotational capacity and an “equivalent” plastic hinge length are evaluated.

  • Special Issues

    • IMPORTANCE OF LINK MODELS IN THE ASSESSMENT OF THE SEISMIC RESPONSE OF MULTI-STOREY EBFS DESIGNED BY EC8

    Melina Bosco, Aurelio Ghersi, Edoardo M. Marino, Pier Paolo Rossi

    SUMMARY: The nonlinear seismic response of eccentrically braced frames is strongly correlated to the cyclic response of links, i.e. the dissipative members of this structural type. In this paper, a simple but refined link model recently proposed by the authors is used to assess the effectiveness of some common and simpler models in which the effect of the isotropic hardening is not taken into account explicitly. The comparison is carried out by comparing the dynamic response of 12 multi-storey eccentrically braced frames designed as per Eurocode 8. The structures are characterised by different number of storeys and link lengths. The investigation considers both global and local response parameters. The results show which model gives the best estimate of the ultimate response of the frames. It is also shown that the major differences between the responses predicted by the models are recorded for systems with long links.