Stefano Pampanin, Tobias Smith, Andy Buchanan
and Massimo Fragiacomo
Department of Civil Engineering, University of Canterbury,
Christchurch, New Zealand
This paper describes the structural design of low-rise multi-storey
timber buildings using a new and exiting structural system. This system
originally developed for use with precast concrete, combines un-bonded
post-tensioning and additional energy dissipaters, providing a recentering
capability after the earthquake, while greatly reducing the structural damage.
This new structural system can be used in multi-storey buildings, with
large structural timber members made from laminated veneer lumber (LVL) or
glulam timber, with lateral loads resisted by prestressed timber frames or
walls, separately or in combination. A case study of a six storey timber office
building in a moderate seismic area is analysed and a virtual design is carried
out, allowing investigation of different methods of structural analysis, and
development of many construction and connection details for rapid construction.
Total building cost is compared to equivalent steel and reinforced concrete
options.
Recent developments in seismic design have led to the development of
damage control design philosophies and innovative seismic resistant systems. In
particular, jointed ductile connections for precast concrete structures have
been implemented and successfully validated. These solutions rely on discrete
dissipative mechanism placed in specific locations in the structure.
A precast concrete seismic resisting system developed in the
U.S.-PRESSS program (PREcast Seismic Structural System), coordinated by the
University of California, San Diego, for frame and wall systems has been shown
to be particularly effective. This system, referred to as the hybrid system,
combines unbonded post-tensioned tendons with grouted longitudinal mild steel
bars or any form of dissipation device.
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