Seismic performance analysis of self-centering steel frame beam-to-column joint with asymmetric SMA connection
An innovative self-centering steel frame beam-to-column joint with asymmetric SMA connection is developed in this paper.Cyclic test are carried on six asymmetric SMA connections with different SMA sections,SMA initial strain and bolt preloads,so the hysteresis curves and energy dissipation capacity are investigated.Then finite element models are established by software ABAQUS to study the seismic performance of steel frame beam-to-column joint with slip connection(SL-BCJ)and asymmetric SMA connection(SC-BCJ),and it is verified against the test results.The test results show that increasing the SMA sections and SMA initial strain can effectively improve the bearing capacity and energy dissipation capacity and reduce the residual deformation of the asymmetric SMA connection,and the optimal value of the slip bolt preload is 30kN.By comparing with the SL-BCJ joints,the ultimate bearing force and energy dissipation value of SC-BCJ with SMA sections of 28 circles are 44.51％and 18.65％greater,respectively,and the residual deformation is 31.37％down.In addition,the SMA wires in the SC-BCJ can spontaneously form the tension force and restoring force to reduce the residual deformation,so the seismic performance and seismic resilience capacity of the innovative SC-BCJ will be dramatically enhanced.
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