TY - JOUR
T1 - Development and experimental validation of a nickel-titanium shape memory alloy self-centering buckling-restrained brace
AU - Miller, David J.
AU - Fahnestock, Larry A.
AU - Eatherton, Matthew R.
N1 - Funding Information:
This study was funded by the National Science Foundation through the Hazard Mitigation and Structural Engineering Program (Grant No. CMMI-0856555 ). The support of SAES Smart Materials is gratefully recognized. Undergraduate research assistant Benjamin Bentley provided valuable assistance with testing and data reduction. The opinions, findings, and conclusions expressed in this paper are those of the authors and do not necessarily reflect the views of those acknowledged here.
PY - 2012/7
Y1 - 2012/7
N2 - Buildings designed with conventional ductile earthquake-resisting structural systems are expected to provide life safety performance, but they rely on significant structural damage to dissipate the seismic energy. This structural damage and the residual drift that may result from the inelastic response can make a building difficult, if not financially unreasonable, to repair after an earthquake. As a result, development of systems that dissipate energy, minimize structural damage, and return to their initial position (" self-center" ) following an earthquake is needed. This paper presents a viable solution including experimental investigation of the cyclic behavior and performance of a self-centering buckling-restrained brace (SC-BRB). A SC-BRB consists of a typical BRB component, which provides energy dissipation, and pre-tensioned superelastic nickel-titanium (NiTi) shape memory alloy (SMA) rods, which provide self-centering and additional energy dissipation. The SMA rods are attached to the BRB portion of the brace using a set of concentric tubes and free-floating end plates that cause the SMA rods to elongate when the brace is in both tension and compression. Large-scale SC-BRBs were designed, fabricated and tested using a cyclic protocol to validate the brace concept. The experimental program demonstrated that NiTi SMA SC-BRBs provide stable hysteretic response with appreciable energy dissipation, self-centering ability, and large maximum and cumulative deformation capacities.
AB - Buildings designed with conventional ductile earthquake-resisting structural systems are expected to provide life safety performance, but they rely on significant structural damage to dissipate the seismic energy. This structural damage and the residual drift that may result from the inelastic response can make a building difficult, if not financially unreasonable, to repair after an earthquake. As a result, development of systems that dissipate energy, minimize structural damage, and return to their initial position (" self-center" ) following an earthquake is needed. This paper presents a viable solution including experimental investigation of the cyclic behavior and performance of a self-centering buckling-restrained brace (SC-BRB). A SC-BRB consists of a typical BRB component, which provides energy dissipation, and pre-tensioned superelastic nickel-titanium (NiTi) shape memory alloy (SMA) rods, which provide self-centering and additional energy dissipation. The SMA rods are attached to the BRB portion of the brace using a set of concentric tubes and free-floating end plates that cause the SMA rods to elongate when the brace is in both tension and compression. Large-scale SC-BRBs were designed, fabricated and tested using a cyclic protocol to validate the brace concept. The experimental program demonstrated that NiTi SMA SC-BRBs provide stable hysteretic response with appreciable energy dissipation, self-centering ability, and large maximum and cumulative deformation capacities.
KW - Buckling-restrained braces
KW - Large-scale testing
KW - Seismic effects
KW - Self-centering
KW - Shape memory alloy
KW - Steel braced frames
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U2 - 10.1016/j.engstruct.2012.02.037
DO - 10.1016/j.engstruct.2012.02.037
M3 - Article
AN - SCOPUS:84860499168
SN - 0141-0296
VL - 40
SP - 288
EP - 298
JO - Engineering Structures
JF - Engineering Structures
ER -