Study of Inelastic Behavior of Steel Structure with Hysteretic Damping Device

Abstract

Earthquakes occur throughout the world. The earth is like a living body in constant motion. Every day small ground movements are registered in some parts of the world and every week a moderate earthquake is reported from some places. The survival of many types of structures during periods of strong ground shaking very often depends on their post-elastic behaviour. Nearly all buildings designed today, survival in large earthquakes depends directly on the ability of the framing system to dissipate energy hysterically while undergoing large inelastic (i.e., plastic) deformations. To achieve this ductile response, one must recognize and avoid conditions that may lead to brittle failures and adopt appropriate design strategies to allow for stable and reliable hysteretic energy-dissipation mechanisms. Therefore, the current scenario of protecting Steel structure from the earthquake loading is moving towards the inelastic deformation from elastic deformation to vanish the energy of severe seismic loading. In present study, characterization of ADAS type metallic damper is carried out Numerically and experimentally to understand cyclic behaviour. It is found that the response of metallic dampers is a function of its geometry and its mechanical characteristics of the metal. Study of different types of metallic damper which are experimented or researched in history has also been done for this work. Here the ADAS type metallic damper is designed for experimental work, SDOF and MDOF portal frame. For the design of the damper, yield displacement of the system is obtained through pushover analysis from SAP2000. After that the designed damper is analysed under sinusoidal load and various Earthquake ground motion in ABAQUS FEM software and through MATLAB program written for Bouc-Wen Model for metallic damper. The ABAQUS and MATLAB results are compared with each other. The designed damper is implemented in SDOF and MDOF portal frames. Time history analysis is done on SDOF and MDOF portal frame with ADAS damper in SAP2000 software and Through MATLAB code written for Newmark beta Method. The results of SDOF and MDOF portal frames with and without ADAS damper are compared. The damper shows very good reduction in maximum roof displacement. Therefore, the implementation of ADAS type metallic dampers in the system is effective. And also small attempts have been made to perform experiments.