Abstract：In order to improve the self-repair ability and self-centering ability of frame joints, reduce the residual deformation of the structure and restore the function of structures after earthquakes, superelastic SMA bars and ECC are used to enhance the seismic performance of frame joints. Five 1/2-scale frame joints were designed and manufactured, including three contrast joints (normal concrete joints, ECC reinforced concrete joints, SMA reinforced concrete joints) and two model joints (ECC joints reinforced by SMA with different lengths). The failure process, energy dissipation capacity, displacement ductility, residual deformation and self-centering performance of the novel frame joints were studied through the low-frequency cyclic loading test, and the self-centering capacity of ECC joints reinforced by SMA with different lengths was also investigated. Test results show that: the ECC material can optimize the development of the plastic hinge at the beam end of the frame, improve the ductility and energy dissipation capacity of the structure, and delay yielding of the structure; SMA-ECC composite system can significantly improve the ductility of the joints and self-centering capability, delay the stiffness degradation, improve the lateral resistance of the structure, but it may reduce the initial stiffness and energy dissipation capacity; the length of the SMA does not significantly affect the self-centering performance of the joint.
钱辉 裴金召 李宗翱 康莉萍. 基于SMA/ECC的新型自复位框架节#br#
点抗震性能试验研究[J]. 土木工程学报, 2020, 53(11): 64-73, 80.
Qian Hui Pei Jinzhao Li Zongao Kang Liping. Experimental study on seismic performance of self-centering #br#
beam-column joints reinforced with superelastic SMA and ECC. 土木工程学报, 2020, 53(11): 64-73, 80.
