Abstract
This paper investigates a new stainless-steel tube-in-tube damper (SS-TTD) designed for the passive control of structures subjected to seismic loadings. It consists of two tubes assembled in a telescopic configuration. A series of slits are cut on the walls of the exterior tube in order to create a series of strips with a large height-to-width ratio. The exterior tube is connected to the interior tube so that when the brace-type damper is subjected to forced axial displacements, the strips dissipate energy in the form of flexural plastic deformations. The performance of the SS-TTD is assessed experimentally through quasi-static and dynamic shaking table tests. Its ultimate energy dissipation capacity is quantitatively evaluated, and a procedure is proposed to predict the failure. The cumulative ductility of the SS-TTD is about 4-fold larger than that reported for other dampers based on slit-type plates in previous studies. Its ultimate energy dissipation capacity is 3- and 16-fold higher than that of slit-type plates made of mild steel and high-strength steel, respectively. Finally, two hysteretic models are investigated and compared to characterise the hysteretic behaviour of the SS-TTD under arbitrarily applied cyclic loads.
Highlights
Seismic-resistant structures have been designed using the conventional approach of ensuring life safety against earthquakes, the main objective being to prevent buildings from collapsing.this approach comes at the cost of assuming important damage to the structure after the earthquake, requiring in most cases its demolition and rebuilding or a high cost of repair
It is seen that the proposed stainless-steel tube-in-tube damper (SS-TTD) has an energy dissipation capacity and an accumulated ductility notably larger than those reported for other dampers in previous studies
The source of energy dissipation is the can be installed in a frame structure as a conventional brace
Summary
Received: 1 February 2020; Accepted: 17 February 2020; Published: 19 February 2020. Featured Application: The damper presented in this paper is applied for the protection of buildings subjected to strong earthquakes; in particular, for preventing or minimizing damage to the main structure and reducing its lateral displacements.
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