Ductility-Equivalent Viscous Damping Relationships for Beam-to-Column Partial-Strength Steel Joints

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Hugo Augusto (Author) Other; José Miguel Castro (Author) FEUP; Carlos Rebelo (Author) Other; Luís Simões da Silva (Author) Other

Journal

Title: Journal of Earthquake Engineering

Vol. 23 No. 5

Pages: 810-836

ISSN: 1363-2469

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 7 Citations

INSPEC

Other information

Authenticus ID: P-00P-R0N

DOI: 10.1080/13632469.2017.1342290

Abstract (EN): This paper seeks to contribute to the development and improvement of displacement-based design procedures, proposing improved ductility-equivalent viscous damping relationships for steel moment-resisting framed structures with dissipative beam-to-column partial-strength joints. These relationships can be used directly in procedures like the Direct Displacement-Based Seismic Design (DDBD) that uses effective stiffness, ductility-equivalent viscous damping relationships, and period-displacement relationships in a performance-based design approach. To this end, a finite element model of a steel beam-to-column sub-assemblage, characterized by an extended end-plate, is developed in ABAQUS. The model, which is validated against monotonic and cyclic experimental data obtained in previous research, is employed to carry out non-linear time-history (NLTH) analyses, using real records scaled to target several levels of ductility demand. A procedure is then proposed and applied to determine the ductility-equivalent viscous damping relationships of the sub-assemblages. The equivalent linearization technique is applied to the non-linear responses obtained in the NLTH analyses, using an elastic single degree of freedom structure and the elastic displacement spectra. The influence of joints mechanisms and of the dynamic characteristics of the structure in the equivalent viscous damping is investigated, and an expression for ductility-equivalent viscous damping is proposed. The proposed expression represents a clear improvement in relation to the existing expressions available in literature.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 27