NUMERICAL STUDY ON HYSTERETIC PERFORMANCE OF ASSEMBLED BEAM-COLUMN STEEL JOINT WITH SMA CONNECTION

Shape memory alloy (SMA) as joint connection material can limit the plastic deformation and improve the seismic resilience of the assembled steel structure under strong earthquakes. An assembled seismic resilient steel joints using SMA material was investigated. A delicate solid finite element model was established and verified by test data. The influence of bolt preload and SMA tendon pre-stress on the mechanics state and hysteretic performance of assembled steel joints were analyzed. The results show that the hysteretic behavior of assembled beam-column steel joints can be well simulated by the finite element model. The assembled beam-column steel joints connected by SMA tendons have excellent seismic resilience. When subjected to the low cyclic loading, the beam, column and their connectors are basically maintained within the elastic range, with a residual displacement of approximately zero. Increasing the bolt preload can increase the friction between the bolt and steel plate, and can improve the carrying capacity and energy dissipation capacity of the beam-column joint. However, increasing the SMA tendon pre-stress has insignificant effect on the mechanics state and hysteretic performance of the beam-column joint.