RESPONSE OF STRUCTURE USING PASSIVE ENERGY DISSIPATING DEVICES

Abstract

Conventional buildings are designed considering bare frame with infills in top storeys and vacating ground storey for utilization of open space for parking and other utilities. This drastic reduction in stiffness at ground storey due to absence of infills creates soft storey which is severely damaged during past earthquake. Seismic performance of these building deteriorates during earthquake due to cyclic loading as structure fails to dissipate energy fed by an earthquake. In recent years, considerable attention has been paid for development of passive energy dissipating devices which can be used to absorb the energy from an earthquake and dissipates by itself, preventing inelastic deformation of structural members. The major drawback of these devices is obstruction of accessible areas of bays to which they are installed. Different configurations of these devices are developed and validated to capture response of structure. Open space damping is an innovative configuration that retrofits the structure without hampering the aesthetics and functionality of open space in building. Open space damping can provide ideal solution to soft storey problem in economic and time saving manner. A comparative study has been done to check the affectivity of open space damping of a 2D reinforced concrete frame having soft storey. Modelling of infills and viscous damper is done with different models and as per the Indian standards to simulate it with practical problem on field. Experiment is conducted on steel frame with open space damping to analyse working mechanism of viscous damper with frame. Experimental results are compared with analytical model prepared in SAP2000, so issues in configuration can be addressed with proper justification.