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- W3109934382 abstract "In the aftermath of the Canterbury (New Zealand) Earthquake Sequence in 2010-2011, the mismatch between societal expectations and the reality of seismic performance of modern buildings was dramatically highlighted. The increased awareness of the various stakeholders of the severe socio-economic impacts of strong earthquakes in terms of damage/dollars/downtime, stimulated the wider acceptance of cost-efficient damage-control technologies. This paper presents and describes the analysis, design and actual implementation of a low-damage 5-storey building system for the New Central Library - Turanga for the Christchurch City Council in New Zealand. Following a Design- Build competition, Lewis Bradford Consulting Engineers carried out the structural engineering design of Turanga as part of the winning team led by Southbase Construction. Prof. Stefano Pampanin was the specialist peer reviewer for the seismic design of the low-damage hybrid (rocking-dissipative) unbonded post-tensioned concrete walls. Turanga was designed and constructed to very stringent performance criteria, targeting a damage-control limit state for a large intensity earthquake (1/1000 years return period), to sustain repairable structural damage during a rare event. Low-damage technology, consisting of integrated self-centering and dissipative mechanisms, that allows the building to sway and then return to its original position, was thus implemented. Part of the innovative system is the displacement-based design and implementation of a primary lateral resisting system consisting of a series of large scale precast concrete core walls, with pivot columns in the edges/corners to decouple the bi-directional response and to activate U-shape Flexural Plates (UFP) devices during the relative rocking motions. The walls are designed to open a gap at the base (e.g. rock, instead of forming a typical plastic hinge) and displace to a targeted interstorey drift level, while shifting the fundamental period of the building (through an internal isolation mechanism) in order to protect the building from the peak earthquake spectral accelerations during a significant seismic event. A second layer of seismic resistance and redundancy is provided by perimeter steel moment resisting frames with dog-bone flanges in the beams and rocking connections at the base. The unbonded post-tensioned rocking and dissipative walls are arranged into three main cores." @default.
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- W3109934382 date "2020-04-01" @default.
- W3109934382 modified "2023-09-23" @default.
- W3109934382 title "The low-damage design of hybrid concrete rocking walls for Turanga Library, Christchurch, New Zealand" @default.
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