A experimental study of a cable-pulleys spring-damper energy dissipation system for buildings

Francisco Hernández*, Rodrigo Astroza, Juan Felipe Beltrán, Xihong Zhang, Vicente Mercado

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

An energy dissipation mechanism made of a cable-pulleys system placed in series with a spring-damper device (fluid viscous) is experimentally studied. The system aims to provide high damping ratios for all the structural modes by using a unique spring-damper device to dissipate the seismic energy of the entire structure (and all its structural modes). Shake table tests and pull-back tests are carried out on a scaled five-story structure to compare the dissipation capabilities provided by the proposed system. Therefore, the same structure is tested under different configurations that included: i) the structure itself without any energy mitigation device, ii) the structure with viscous dampers installed on each story, iii) the structure with the proposed cable-pulleys and the spring-damper system, and iv) the structure with the cable-pulleys system but without any dissipation device. The experimental results showed that the structure with the proposed system exhibits a highly nonlinear response (mainly explained by the cable-pulleys interaction) evidenced by the significant change of the structure's dynamic properties during the time. The Short-Time Transfer Function plots show that the structure's natural frequencies change significantly when the cable-pulleys system is included. Complementarily, a novel time-variant system identification approach, termed Mod-ζ(var), is proposed, which allows estimating the time-variant evolution of the structure's dynamic properties during seismic tests (natural frequencies, damping ratios, and mode shapes). Moreover, the Mod-ζ(var) approach also enables computing relevant engineering quantities such as the empirical response spectrum from experimental data. It is found that the analyzed energy dissipation system provides high damping ratios (>10%) for all the structural modes, allowing reducing the seismic demands in terms of the empirical response spectrum, inter-story drifts, inter-story shear forces, peak accelerations, and Housner Intensities at each floor.

Original languageEnglish
Article number104034
JournalJournal of Building Engineering
Volume51
DOIs
StatePublished - 1 Jul 2022

Bibliographical note

Funding Information:
The authors acknowledge the financial support from the Chilean National Commission for Scientific and Technological Research ( CONICYT ) through the research grant FONDEF ID 18I10103 . The authors also acknowledge the support provided by Professor Pedro Soto and the former civil engineering student Leonardo Belmar from the University of Chile .

Publisher Copyright:
© 2022

Keywords

  • Cable-pulleys spring-damper system
  • Empirical response spectrum
  • Energy dissipation
  • MOD-Ζ(VAR) Approach
  • Normalized seismic modes
  • System identification
  • Time-variant modal parameters

Fingerprint

Dive into the research topics of 'A experimental study of a cable-pulleys spring-damper energy dissipation system for buildings'. Together they form a unique fingerprint.

Cite this