Case Studies in Construction Materials (Jul 2024)
Behavioral characteristics analysis of pretension damper with superelastic shape memory alloy
Abstract
Earthquakes occur without warning and cause considerable shock to structures by shaking the ground. If deformation or damage beyond the permissible range occurs in a structure owing to an earthquake, serious problems arise in terms of usability, repair, and reinforcement. Therefore, numerous seismic reinforcement devices have been developed to prevent structural damage caused by earthquakes. However, the existing seismic reinforcement devices are problematic because they need to be replaced after an earthquake owing to deformation. Therefore, in this study, we developed a pretension damper, a seismic reinforcement device that exhibits excellent recentering, load resistance, and energy dissipation capacity performances by applying superelastic shape memory alloy wire with pretension and friction bolts, and analyzed the behavior characteristics. For this purpose, the design parameters set as the diameter and material of the wire, pretension, and friction bolts. Finite element analysis was performed using the ABAQUS program for a total of 24 dampers according to design parameters, and maximum load performance, energy dissipation capacity, residual displacement was analyzed. The results confirmed that the recentering and load resistance performance are improved when pretension is applied, and the energy dissipation performance is improved when friction bolts are installed. Applying the superelastic shape memory alloy instead of Gr. 50 steel enhances the damper performance in terms of the maximum force, energy dissipation capacity, and residual displacement. In particular, when pretension is applied to Gr.50 steel wire, performance deteriorates, so pretension is not recommended in this case. In particular, the application of pretension to Gr.50 steel wire is not recommended due to reduced performance. The best performance was SPF20 damper, which showed a maximum load of 1153.7 kN, residual displacement of 0 mm, and energy dissipation capacity of 309855.19 kN·mm.
