Steel and Composite Structures

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Dissipative Replaceable Bracing Connections (DRBrC) for earthquake protection of steel and composite structures

  • Jorge M. Proenca (CERIS, Instituto Superior Tecnico, Universidade de Lisboa) ;
  • Luis Calado (CERIS, Instituto Superior Tecnico, Universidade de Lisboa) ;
  • Alper Kanyilmaz (Department of Architecture, Built Environment and Construction Engineering, Politecnico di Milano)
  • Received : 2022.05.17
  • Accepted : 2022.12.12
  • Published : 2023.01.25
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Abstract

The article describes the development of a novel dissipative bracing connection device (identified by the acronym DRBrC) for concentrically braced frames in steel and composite structures. The origins of the device trace back to the seminal work of Kelly, Skinner and Heine (1972), and, more directly related, to the PIN-INERD device, overcoming some of its limitations and greatly improving the replaceability characteristics. The connection device is composed of a rigid housing, connected to both the brace and the beam-column connection (or just the column), in which the axial force transfer is achieved by four-point bending of a dissipative pin. The experimental validation stages, presented in detail, consisted of a preliminary testing campaign, resulting in successive improvements of the original device design, followed by a systematic parametric testing campaign. That final campaign was devised to study the influence of the constituent materials (S235 and Stainless Steel, for the pin, and S355 and High Strength Steel, for the housing), of the geometry (four-point bending intermediate spans) and of the loading history (constant amplitude or increasing cyclic alternate). The main conclusions point to the most promising DRBrC device configurations, also presenting some suggestions in terms of the replaceability requirements.

Keywords

Acknowledgement

The studies reported in this article were conducted within the scope of the DISSIPABLE (Fully Dissipative and Easily Repairable Devices for Resilient Buildings with Composite Steel-Concrete Structures, reference EU RFCS 2017 Project No 800699) research project, financed by the Research Fund for Coal and Steel, of the European Commission. The availability of all the involved organizations - POLIMI (Politecnico di Milano, Italy), IST-UL (Instituto Superior Tecnico, Universidade de Lisboa, Portugal), NTUA (National Technical University of Athens, Greece), SOFMAN (Masina Team SA, Greece), UNITN (Universita degli studi di Trento, Italy), RWTH (Institute for Steel Structures, Aachen University, Germany), RINA (Rina Consulting - Centro Sviluppo Materiali SPA, Italy), UNIPI (Universita di Pisa, Italy) - as well as the insight and clairvoyance of Professor Carlo A. Castiglioni (Politecnico di Milano, Italy) are gratefully acknowledged. The first two authors are grateful for the Foundation for Science and Technology's support through funding UIDB/04625/2020 from the research unit CERIS. The experimental tests of the DRBrC devices were conducted in LERM of IST - UL with the intensive assistance of the graduates Diogo Cabrita, Nuno Rosas and Sergio Nascimento, whose contribution is also acknowledged with gratitude.

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