Seismic Behaviour of Innovative Energy Dissipation Systems Fuseis 1-2

Abstract eng:
Modern seismic codes allow for inelastic deformations in dissipative zones during design earthquakes, accepting damage to a certain extent in the relevant structural parts. As past experience shows, repair works are needed after strong earthquakes, either less or larger than the design one. Structural systems that are easily repairable-replaceable, while maintaining the benefits of high ductility, are therefore beneficial in seismic regions. The scope of European Research Program “FUSEIS” was the development and study of two such innovative systems. The first, FUSEIS 1, consists of a pair of strong columns jointed together by fuses forming a shear resistance wall whereas in the second system, FUSEIS 2, the devices are made by introducing a discontinuity on the composite beams of a moment resisting frame. The main advantage of the “FUSEIS” compared to conventional systems is that inelastic deformations are strictly concentrated in controlled zones. The dissipative elements can be positioned in small areas of the building and do not interrupt the architectural plan as braced do. Another advantage of the system is the possibility of easy installation and removal within the structure. In order to enhance the stiffness, strength and energy dissipation capacity of FUSEIS 1 system, several fuses are provided within each storey. Depending on the geometry of the fuse two cases were examined: FUSEIS 1-1 and FUSEIS 1-2. In FUSEIS 1-1system the dissipative fuses are beams. In FUSEIS 1-2 the fuses consist of beams cut in the middle and connected by short pins. The dissipative zones in this case are formed within the pins while the other parts of the structure remain elastic and protected. This study focuses on the research carried out to evaluate the behavior of the FUSEIS 1-2 system and includes the results of the full scale tests conducted in NTUA and application examples of the system on real building frames.

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