Dynamic High-Rise Moment Resisting Frame Dissipation Performances Adopting Glazed Curtain Walls with Superelastic Shape Memory Alloy Joints

This paper summarizes the results of a survey on
smart non-structural element dynamic dissipation when installed
in modern high-rise mega-frame prototypes. An innovative glazed
curtain wall was designed using Shape Memory Alloy (SMA)
joints in order to increase the energy dissipation and enhance
the seismic/wind response of the structures. The studied buildings
consisted of thirty- and sixty-storey planar frames, extracted from
reference three-dimensional steel Moment Resisting Frame (MRF)
with outriggers and belt trusses. The internal core was composed of
a CBF system, whilst outriggers were placed every fifteen stories
to limit second order effects and inter-storey drifts. These structural
systems were designed in accordance with European rules and
numerical FE models were developed with an open-source code,
able to account for geometric and material nonlinearities. With
regard to the characterization of non-structural building components,
full-scale crescendo tests were performed on aluminium/glass curtain
wall units at the laboratory of the Construction Technologies
Institute (ITC) of the Italian National Research Council (CNR),
deriving force-displacement curves. Three-dimensional brick-based
inelastic FE models were calibrated according to experimental results,
simulating the fac¸ade response. Since recent seismic events and
extreme dynamic wind loads have generated the large occurrence of
non-structural components failure, which causes sensitive economic
losses and represents a hazard for pedestrians safety, a more
dissipative glazed curtain wall was studied. Taking advantage of the
mechanical properties of SMA, advanced smart joints were designed
with the aim to enhance both the dynamic performance of the single
non-structural unit and the global behavior. Thus, three-dimensional
brick-based plastic FE models were produced, based on the innovated
non-structural system, simulating the evolution of mechanical
degradation in aluminium-to-glass and SMA-to-glass connections
when high deformations occurred. Consequently, equivalent nonlinear
links were calibrated to reproduce the behavior of both tested and
smart designed units, and implemented on the thirty- and sixty-storey
structural planar frame FE models. Nonlinear time history analyses
(NLTHAs) were performed to quantify the potential of the new
system, when considered in the lateral resisting frame system (LRFS)
of modern high-rise MRFs. Sensitivity to the structure height was
explored comparing the responses of the two prototypes. Trends
in global and local performance were discussed to show that, if
accurately designed, advanced materials in non-structural elements provide new sources of energy dissipation.

Authors:

• Lorenzo Casagrande
• Antonio Bonati
• Ferdinando Auricchio
• Antonio Occhiuzzi

Keywords:

• Advanced technologies
• glazed curtain walls
• non-structural elements
• seismic-action reduction
• shape memory alloy.

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