Multiple inelastic mechanisms analysis (MIMA): A simplified method for the estimation of the seismic response of RC frame buildings

摘要

In the last decade, a number of methodologies for the seismic performance assessment of existing buildings have been proposed. They are based on comprehensive probabilistic procedures where uncertainties related to ground motions, construction and material quality are explicitly accounted for. Structural analysis is performed to evaluate the seismic demand to the structure through a number of Engineering Demand Parameters (EDPs) (i.e.: inter-story drift ratios, floor accelerations, etc.). In this respect, the use of Nonlinear Response History Analyses (NRHAs) appears to be computationally expensive, time demanding and potentially tricky for most practicing engineers. On the other hand, simplified approaches, based on linear static analysis, are affected by strong limitations of use and loss of accuracy towards seismic performance assessment.