Spring tube braces for seismic isolation of buildings

V. Karayel, Ercan Yuksel*, T. Gokce, F. Sahin

*Corresponding author for this work

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

10 Citations (Scopus)


A new low-cost seismic isolation system based on spring tube bracings has been proposed and studied at the Structural and Earthquake Engineering Laboratory of Istanbul Technical University. Multiple compression-type springs are positioned in a special cylindrical tube to obtain a symmetrical response in tension and compression-type axial loading. An isolation floor, which consists of pin-ended steel columns and spring tube bracings, is constructed at the foundation level or any intermediate level of the building. An experimental campaign with three stages was completed to evaluate the capability of the system. First, the behavior of the spring tubes subjected to axial displacement reversals with varying frequencies was determined. In the second phase, the isolation floor was assessed in the quasi-static tests. Finally, a ¼ scaled 3D steel frame was tested on the shake table using actual acceleration records. The transmitted acceleration to the floor levels is greatly diminished because of the isolation story, which effects longer period and higher damping. There are no stability and self-centering problems in the isolation floor.

Original languageEnglish
Pages (from-to)219-231
Number of pages13
JournalEarthquake Engineering and Engineering Vibration
Issue number1
Early online date26 Jan 2017
Publication statusE-pub ahead of print - 26 Jan 2017


  • base isolation
  • low-cost isolation
  • seismic isolation
  • spring tube


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