Advanced Flag-Shape Systems for High Seismic Performance including Near-fault Effects

A. Palermo

Politecnico di Milano, Milan, Italy

W.Y. Kam, A.J.Carr and S. Pampanin

Department of Civil Engineering, University of Canterbury, Christchurch, New Zealand

Presented at New Zealand Society for Earthquake Engineering Annual Conference (NZSEE07), New Zealand, 2007.

Lessons from the recent earthquakes (Northridge 1994, Kobe 1995, Chi-Chi 1999) highlighted the vulnerability of current buildings. This underscores the inadequacy of the traditional ductile design, which has been primarily focussed on collapse prevention, in limiting financial costs, in terms of repair, downtime and rehabilitation costs. Subsequently, with the introduction of the Performance-Based Earthquake Engineering (PBEE) (SEASOC 1995), emphasis has been given to minimizing damage and building downtime post-earthquake events. The concept of the Performance-Based Earthquake Engineering (PBEE) has also been extended to seismic retrofitting as stakeholders seek to achieve targeted performance levels especially in critical-use structures such as hospitals (fib 2003a). In line with development of the Performance-Based Earthquake Engineering (PBEE), high-performance seismic resisting systems that are able to sustain major ground motions without substantial damage have been developed in the precast concrete industry.

In recent contributions (Kam et al. 2006), authors have proposed the concept of combining velocity-dependent and displacement-dependent (hysteretic or friction) dissipation, in parallel with a re-centering element, as advanced hybrid systems or, hereafter called as the Advanced Flag-shape Systems (AFS) or advanced hybrid systems as an alternative solution for high-seismic performance system in near-fault regions. The present paper addresses the challenge of further validating the concept of Advanced Flag-shape (AFS) systems with the emphasis on its superiority against near-fault effects. The conceptual development and key parameters in the design process of the Advanced Flag-shape Systems (AFS) systems will be briefly summarised. Then, the enhanced seismic performance is demonstrated with a series of inelastic time history analysis using a suite of far field and near-field records. This paper represents part of the analytical work that belongs to a larger experimental-analytical investigation program for advanced seismic resisting system at the University of Canterbury.

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