Experimental testing and numerical analysis of steel angles as hysteretic energy dissipating devices - H11

The following paper describes the experimental testing and numerical analysis of dissipative steel angles for the increase of the hysteretic capacity of systems which otherwise have nominal amounts of damping. The method is based on the DIS-CAM system developed at the University of Basilicata in Potenza, Italy. Additional dissipative devices can be placed at the beam-column and/or column-foundation connection. The dissipative device consists of a steel angle, weakened either by drilling holes and/or removing part of the thickness of the section and thus reducing by a significant amount of the angles cross section. This in turn concentrates yielding in a certain controlled region with characteristics which can be controlled to give the required hysteretic behaviour in design (i.e. stiffness and strength). Testing has been performed in the structural laboratory of the University of Basilicata, Potenza, Italy as preliminary part of the PRESS-DIS-LAM project in collaboration with the University of Canterbury, Christchurch, New Zealand in order to apply the hysteretic energy dissipating systems also for multi-storey post-tensioned timber frame buildings (Ponzo et al. 2013). Different dissipative steel angle devices were loaded at a rate of 0.5mm/sec and only in the positive direction. The main goal of this paper is to characterize the cyclic behaviour of these steel angles and to simplify the design procedures. Finite element models and a quick hand calculation procedure have been made in order to reproduce and simulate the experimental performance of the angle system.

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