The Hysteretic Energy Demand And Distribution Throughout The Story Of Steel Moment Resisting Frames

The current seismic design procedures are based on strength and do not account for the duration of strong motion. It does not provide enough information on the inelastic behavior of the structures and the seismic performance of buildings under design earthquake and rare earthquake could not be explicitly controlled. At the same time, it does not reveal the influence of different structures on hysteretic energy. An energy-based design approach takes into consideration force, displacement and the duration of strong motion and can give a comprehensive assessment of the degree of structural damage.Three steel moment resisting frames (SMRFs) with 3-,6-, and 10-stories are designed according to current seismic code provisions by PKPM and SAP2000 in this paper. A finite element model is established by ABAQUS. A total of 30 far-fault and near-fault earthquake ground motion records are selected. A non-linear dynamic time history (NDTH) analysis is carried out to determine the hysteretic energy demand and distribution of throughout the story of SMRFs. By regression analysis, a simplified formula of hysteretic energy demand distribution along the story of SMRFs subjected to severe earthquake ground motions is presented.Comparative analysis is carried out on the story distribution of hysteretic energy demand and story drift for SMRFs subjected to far-fault and near-fault earthquake ground motions. This paper examines the influence of ground motion characteristics (severity, frequency content, strong motion duration) and structural characteristics on the laws of story distribution of hysteretic energy for SMRFs.