EXPERIMENTAL INVESTIGATION OF SELF-CENTERING STEEL COLUMNS WITH SMA BOLTS
Bin Wang 1*, Songye Zhu 1
1 Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
This paper investigates the cyclic responses of a novel type of steel column equipped with shape memory alloy (SMA) bolts in the base connection, which is motivated by the recent use of SMAs to achieve the target of minimal-damage structures under strong earthquakes. Cyclic loading tests of two scaled steel columns were carried out to investigate the effects of the length of SMA bolts, the prestrain level in SMA bolts, and the axial compressive force in the column. Test results indicate that both specimens generally exhibited satisfactory and stable flag-shaped hysteretic loops with good self-centering ability and moderate energy dissipation capabilities. Moreover, the initial prestrain in the SMA bolts and compressive force in the column can improve the self-centering ability. The novel self-centering column shows effective and promising solutions to seismic resilience design.
Rocking column; Shape memory alloy; Self-centering; Flag-shaped hysteretic loop; seismic resilience