A frictional sliding on a sprung slope (FSSS) device that axiomatically confers energy dissipation with re-centring to post-tensioned (PT) frames: A conceptual study

Yichen Zhang*, Raffaele De Risi, Nicholas A Alexander

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

A conceptual novel frictional sliding on a sprung slope (FSSS) device is proposed for application with post-tensioned (PT) frames (which have a nonlinear elastic characteristic). This FSSS device has an amplitude-dependent hysteretic resistance nature. The mechanical schematization and design implementation are presented, followed by its analytical formulations. Theoretical analysis indicates that the estimated equivalent viscous damping ratio of the PT frame with the FSSS device must increase with the amplitude of drift ratio oscillations. Three heuristic PT frames with and without the FSSS device are analysed numerically using OpenSees as a numerical proof-of-concept. Both quasi-static (cyclic push-over) and nonlinear dynamic structural analyses are performed. The numerical results of the PT part are benchmarked against the experimental test, and those of the FSSS part are verified by the theoretical formulations. Quasi-static cyclic tests indicate that the PT frame with the FSSS device has a triangular flag-shaped hysteretic curve rather than a parallelogram flag-shape, as in traditional self-centring systems. This triangular flag-shape is an advantage as it does not inhibit re-centring of the PT frame as its activation force threshold is effectively zero. Incremental dynamic analyses (IDA) are also carried out for a set of ground motions. The IDA results show that the device significantly reduces the earthquake response of the PT frame in terms of drift ratios. Additionally, no residual deformations are observed after the earthquake excitations, validating the axiomatic self-centring feature of the PT frames with FSSS devices.
Original languageEnglish
Article number112794
JournalEngineering Structures
Volume244
Early online date17 Jul 2021
DOIs
Publication statusE-pub ahead of print - 17 Jul 2021

Bibliographical note

Funding Information:
The first author was supported by the University of Bristol - China Scholarship Council joint-funded Scholarship to participate in this research. The authors wish to acknowledge the sponsors. However, any opinions, findings, conclusions and recommendations presented in this paper are those of the authors and do not reflect the views of the sponsors.

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • friction damper
  • nonlinear elastic moment-resisting frames
  • self-centring frames
  • incremental dynamic analysis

Fingerprint

Dive into the research topics of 'A frictional sliding on a sprung slope (FSSS) device that axiomatically confers energy dissipation with re-centring to post-tensioned (PT) frames: A conceptual study'. Together they form a unique fingerprint.

Cite this