2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
Cyclic performance of post tensioned steel beam column connection with end plates and shape memory alloy bars

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Author(s)
Mr. Md Arman Chowdhury, The University of British Columbia (Presenter)
Mr. Ahmad Rahmzadeh, The University of British Columbia
Dr. Shahria Alam, University of British Columbia
Abstract

Damage due to earthquake has become a major concern for both practicing engineers and researchers in the regions with high seismicity. Demolition of the whole structure rather than repairing is often the most economical solution in case of high residual deformation. High cost and time required for demolition and rebuilding can be a burden to the overall economy of a country.  In a moment frame, permanent deformation after a severe earthquake can be eliminated by utilizing post tensioned (PT) self centering connections. In this connection, post-tensioning steel strands are used to pre-compress the beam to the column which introduces self centering capability to the connection. However, inelastic deformation in energy dissipating element is inevitable in this case. Cost and time are needed to replace energy dissipaters after each major earthquake. An innovative PT connection with shape memory alloy (SMA) can solve the above-mentioned problem. An end plated PT connection with the SMA bar is proposed and investigated in this study. Due to the superelastic property and large strain recovery, the SMA bar can sustain consecutive earthquake without any residual deformations.  Although, no plastic strain remains in the SMA bar after load removal, energy dissipation capacity of this connection is comparatively low. To identify the optimized combination for the connection with sufficient strength, stiffness and energy dissipation, a parametric study is conducted. Preliminary design consideration is also suggested based on the numerical investigations.