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Loading tests of a brace-type multi-unit friction damper using coned disc springs and numerical assessment of its seismic response control effects

  • Takeshi Sano
  • Kazutaka ShiraiEmail author
  • Yasumasa Suzui
  • Yoshikazu Utsumi
Original Research
  • 22 Downloads

Abstract

In this paper, the performance of a multi-unit friction damper with high-tension bolts tightened via coned disc springs was experimentally investigated, and the response control effects achieved by the friction damper were numerically assessed. Elemental tests were performed to obtain the basic characteristics of dampers composed of two friction units. The dampers exhibited a stable rigid-plastic restoring force characteristic without significant degradation of the frictional force even under repetitive loading operations. In full-scale tests, the performance of a brace-type damper composed of eight or 10 friction units and incorporated into a steel frame was investigated. The brace-type damper demonstrated stable performance and showed no remarkable decrease in the sliding force, even under repeated loading. The damper was shown to produce a total frictional force approximately proportional to the number of the friction units. Thus, the total frictional force of the damper can be estimated as the sum of the contributions of the friction units. Moreover, adopting multiple friction units and assembling them permit the damper to achieve a high total frictional force capacity. Earthquake response analysis was conducted using a 30-story high-rise building model incorporating the brace-type dampers to assess their performance against various earthquake motions, including long-period, long-duration motions and pulse-like motions. By installing the high-capacity brace-type dampers into the two spans out of 12 spans for each floor of the main frame, a response reduction effect was obtained in most analytical cases compared to the model without dampers.

Keywords

Friction unit Rigid-plastic restoring force High-rise building Earthquake response Long-period, long-duration motions Pulse-like motions 

Notes

Acknowledgements

In this study, response analysis was carried out using the design earthquake motions published by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) and provided by the Study Group on the Design Earthquakes for Buildings and Design Methods against Inland Near-field Earthquakes in Osaka Prefecture Area (Organized in JSCA KANSAI). The earthquake record of the 2016 Kumamoto earthquake observed by Kumamoto Prefecture was also used in the present analysis. We would like to express our gratitude to these organizations for providing the design earthquake motions and the seismic observation data.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Technical Research InstituteObayashi CorporationKiyoseJapan
  2. 2.Faculty of EngineeringHokkaido UniversitySapporoJapan
  3. 3.Specialty Construction DepartmentObayashi CorporationMinato-kuJapan

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