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Structural Engineering and Mechanics
  Volume 46, Number 4, May25 2013, pages 487-504

Experimental investigation of a new steel friction device with link element for seismic strengthening of structures
Panikos K. Papadopoulos, Thomas N. Salonikios, Stergios A. Dimitrakis and Alkis P. Papadopoulos

    In the present work a new friction device, with a set of single or double rotational friction flanges and a link element, is described and tested. The mechanism may be applied for the strengthening of existing r/c or steel buildings as well as in new constructed buildings. The device has selectable variable behavior in different levels of displacement and an interlock me a hanism that is provided by the link element. The link element may be designed to lock at preselected level of displacement, offering in this way an extra safety reserve against strong earthquakes. A summary of the existing literature about other similar mechanisms is initially presented in this paper. The proposed mechanism is presented and described in details. Laboratory experiments are presented in detail and the resulted response that proves the efficiency of the mechanism at selectable levels of strength capacity is discussed. Drawings of the mechanism attached to a r/c frame with connection details are also included. Finally a dynamic analysis of two r/c frames, with and without the proposed mechanism attached, is performed and the resulted response is given. The main conclusion is that the proposed mechanism is a cheap and efficient devise for the improvement of the performance of new or existing framed buildings to seismic loads.
Key Words
    multi-storey frames; bracing; variable strengthening; metal friction device; experimental tests; cyclic loading; link element; numerical approach
Panikos K. Papadopoulos, Stergios A. Dimitrakis and Alkis P. Papadopoulos : Aristotle University of Thessaloniki, Department of Civil Engineering, University Campus,
Thessaloniki, Greece
Thomas N. Salonikios : Earthquake Planning and Protection Organization, Research Division, Agiou Georgiou 5,
Thessaloniki, Greece

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