Structural Seismic Response Control Using Passive Control Devices

Abstract

In the present study, the seismic performance of R.C.C structure with X-plate damper (XPD) and superelastic shape memory alloy (SMA) damper is investigated. The combined effect of both XPD and SMA damper in the building is also considered. Metallic devices are made up of thin steel plates available in X or V shape triangular element, manufactured with mild steel or copper or aluminum material having thickness 2mm to 6mm. These devices work based on the concept that melting of metals through a loss of energy in the form of heat. Mechanism of X-plate damper involves energy dissipation in the form of heat, and it is effective technique during the earthquake to absorb the input energy of the structure. Metallic dampers utilize the inelastic deformation of metals and absorb the energy during vibration of structures. Similarly, shape memory alloys belong to a class of smart materials and are capable of regaining its original shape when subjected to heat at a specific temperature. Hence, SMA damper is used as energy dissipater and re-centering components. In the present study, numerical investigation is carried out with nonlinear time history analysis of a three storeyed R.C.C structure equipped with XPD and SMA damper. The equivalent linearization and stiffness method are considered. In X-plate damper, the variations in the parameter, namely size (a=b=40mm and a=b=60mm) and thickness (t=3mm and t=6mm) of the steel plate and SMA wire diameter (0.4mm and 1.2mm) are also evaluated. The analysis results show that there is a decrease in the overall displacement of the building. The results of analysis indicated that XPD, SMAD and combined effect of XPD and SMAD can effectively reduce the displacement of the structure during an earthquake. The XPD having thickness t=3mm and t=6mm with size of plate a=b=40mm is more effective compared to a=b=60mm. In addition, it is also noted that SMA having 0.4mm wire is effective compared to 1.2mm wire damper and is also more effective comparison with the XPD in the building. It is also observed that combined effect of XPD with size a=b=40mm and SMA wire diameter of 0.4mm is more effective compared to the higher thickness of the XPD. The results indicate that the utilizationof the proposed X-plate damper, SMA damper and combined effect of XPD and SMAD are effective in reducing the peak roof displacement and acceleration.