A. Palermo
Department of Structural Engineering,
Politecnico di Milano, Milan,
Italy
S. Pampanin, W. Y. Kam and A. J. Carr
Department of Civil Engineering, University of Canterbury,
Christchurch, New Zealand
Presented at New Zealand
Society for Earthquake Engineering Annual Conference (NZSEE08),
New Zealand,
2008.
In this contribution, the concept of AFS systems is extended to MDOF
systems. Preliminary suggestions for a simplified design procedure for AFS
connection systems are given within the framework of a Direct
Displacement-Based Design (DDBD) approach. Using case-study prototypes of
five-storey moment-resisting frame, incorporating four different connection
systems, a comparative MDOF study is carried out by the means of non-linear
time-history analyses using suites of far-field and nearfault earthquake
excitations. The non-linear time history analysis results for both far-field
and near-fault earthquakes provided satisfactory validation of the design
procedure, though being, as expected, on the conservative side when dealing
with velocity-dependent dissipating systems.
In the search of alternative retrofit techniques and new
seismic-resisting systems that would perform to the performance objectives in
line with the framework of the Performance-based Earthquake Engineering (PBEE),
structural systems with the emphasis on minimising damage and financial losses
have been recently developed. The introduction of jointed-ductile precast
concrete systems (typically referred to as PRESSS-technology), where un-bonded
post-tensioned tendons are used in conjunction with hysteretic energy
dissipation elements to achieve self-centering capacity, hence guaranteeing
negligible residual deformation on the structural systems and assuring minimum
damage in the structural elements (Priestley et al., 1999), is considered one
of the main seismic research outcome highlights of the past decade. Further
research in the development of re-centering systems based on a controlled
rocking motion has extended its application to steel (Christopoulos et al.,
2002) and timber structures (Palermo et al., 2005). In parallel, investigations
have been carried out on the feasibility of combining re-centering systems with
viscous damping (Kurama, 2001) or friction energy dissipation devices (Morgen
and Kurama, 2004). In conjunction to the development of these new structural
system, the argument to use a residual deformation damage index (RDDI), in
combination to traditional damage indexes based on ductility, maximum
displacement and/or cumulated energy, as a more appropriate damage indicator
was made (Pampanin et al., 2002). Recognising that minimal residual deformation
as a critical component of a design objectives, as with maximum displacements,
better performance levels can be achieved with re-centering structural systems.
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