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A platform for research: civil engineering, architecture and urbanism
Seismic performance of self-centering concrete-filled square steel tubular column-to-steel beam connection equipped with SMA bolts
https://orcid.org/0000-0002-1018-5833
Abstract This study demonstrates the considerable potential of the combined application of superelastic NiTi shape memory alloy (SMA) bolts and brass friction energy dissipation devices for self-centering connections to effectively deal with both the large residual drift and lower energy dissipation of traditional connections after an earthquake. Cyclic tests were conducted on eight 1/2 scaled concrete-filled square steel tubular (CFSST) column-to-steel beam connections, including seven T-stub steel connections with SMA bolts and one conventional T-stub steel connection with normal high-strength bolts. The mechanical behavior of the connection was analyzed considering the effect of the pre-strain of the SMA bolt and the pretension force in the friction bolts through web friction devices (WFDs). The results showed that the SMA connection specimen exhibited recognizable double-flag-shaped hysteretic responses with excellent recentering ability and moderate energy dissipation capability, and the primary structural components remained elastic after each cyclic loading. The self-centering capacity of the SMA connection increases with an increase in the pre-strain of the SMA bolt, and the energy dissipation capacity of the SMA connection increases with an increase in the pre-tension force in the friction bolts. Moreover, the SMA self-centering connection has good shock resistance and repairability. After an earthquake, the seismic performance of the SMA connection can be quickly restored by replacing the T-stub steel.
Highlights An innovative self-centering connection equipped with SMA bolts was proposed. The SMA joint has excellent energy dissipation and self-centering ability. The recentering capacity can be improved by the initial pre-strain of the SMA bolts. A friction damper can better improve the energy dissipation capacity of the joint. The SMA self-centering joint has good seismic resistance and repairability.
Seismic performance of self-centering concrete-filled square steel tubular column-to-steel beam connection equipped with SMA bolts
https://orcid.org/0000-0002-1018-5833
Abstract This study demonstrates the considerable potential of the combined application of superelastic NiTi shape memory alloy (SMA) bolts and brass friction energy dissipation devices for self-centering connections to effectively deal with both the large residual drift and lower energy dissipation of traditional connections after an earthquake. Cyclic tests were conducted on eight 1/2 scaled concrete-filled square steel tubular (CFSST) column-to-steel beam connections, including seven T-stub steel connections with SMA bolts and one conventional T-stub steel connection with normal high-strength bolts. The mechanical behavior of the connection was analyzed considering the effect of the pre-strain of the SMA bolt and the pretension force in the friction bolts through web friction devices (WFDs). The results showed that the SMA connection specimen exhibited recognizable double-flag-shaped hysteretic responses with excellent recentering ability and moderate energy dissipation capability, and the primary structural components remained elastic after each cyclic loading. The self-centering capacity of the SMA connection increases with an increase in the pre-strain of the SMA bolt, and the energy dissipation capacity of the SMA connection increases with an increase in the pre-tension force in the friction bolts. Moreover, the SMA self-centering connection has good shock resistance and repairability. After an earthquake, the seismic performance of the SMA connection can be quickly restored by replacing the T-stub steel.
Highlights An innovative self-centering connection equipped with SMA bolts was proposed. The SMA joint has excellent energy dissipation and self-centering ability. The recentering capacity can be improved by the initial pre-strain of the SMA bolts. A friction damper can better improve the energy dissipation capacity of the joint. The SMA self-centering joint has good seismic resistance and repairability.
Seismic performance of self-centering concrete-filled square steel tubular column-to-steel beam connection equipped with SMA bolts
https://orcid.org/0000-0002-1018-5833
Abstract This study demonstrates the considerable potential of the combined application of superelastic NiTi shape memory alloy (SMA) bolts and brass friction energy dissipation devices for self-centering connections to effectively deal with both the large residual drift and lower energy dissipation of traditional connections after an earthquake. Cyclic tests were conducted on eight 1/2 scaled concrete-filled square steel tubular (CFSST) column-to-steel beam connections, including seven T-stub steel connections with SMA bolts and one conventional T-stub steel connection with normal high-strength bolts. The mechanical behavior of the connection was analyzed considering the effect of the pre-strain of the SMA bolt and the pretension force in the friction bolts through web friction devices (WFDs). The results showed that the SMA connection specimen exhibited recognizable double-flag-shaped hysteretic responses with excellent recentering ability and moderate energy dissipation capability, and the primary structural components remained elastic after each cyclic loading. The self-centering capacity of the SMA connection increases with an increase in the pre-strain of the SMA bolt, and the energy dissipation capacity of the SMA connection increases with an increase in the pre-tension force in the friction bolts. Moreover, the SMA self-centering connection has good shock resistance and repairability. After an earthquake, the seismic performance of the SMA connection can be quickly restored by replacing the T-stub steel.
Highlights An innovative self-centering connection equipped with SMA bolts was proposed. The SMA joint has excellent energy dissipation and self-centering ability. The recentering capacity can be improved by the initial pre-strain of the SMA bolts. A friction damper can better improve the energy dissipation capacity of the joint. The SMA self-centering joint has good seismic resistance and repairability.
Seismic performance of self-centering concrete-filled square steel tubular column-to-steel beam connection equipped with SMA bolts
Zhu, Lihua (author) / Ning, Qiujun (author) / Han, Wei (author) / Zhao, Cheng (author)
Thin-Walled Structures ; 183
2022-11-05
Article (Journal)
Electronic Resource
English
Seismic behavior of self-centering concrete-filled square steel tubular (CFST) Column Base
| British Library Online Contents | 2019
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| British Library Online Contents | 2009