Markov Model for Local and Global Damage Indices in Seismic Analysis

摘要

Research in the study has focused on several important issues regarding probabilistic seismic performance of structural systems. Three major directions of research have been pursued. They include (1) evaluation of effects of simplifications in reliability-based design codes, (2) development of a new methodology based on Markov model for seismic reliability of degraded structures, and (3) development of analytical relations between local and global damage indices for seismic analysis of shear type buildings. Static and dynamic analyses are performed to evaluate reliability based-design codes. Both strength- and damage-based failure criteria are used to determine seismic reliability of several code-design structures. Results suggest that reliability depends on the mean arrival rate and the intensity of seismic load process. Sites with frequent small earthquakes have very different reliability indices than those at sites with infrequent large earthquakes, although the sites are characterized by the same value of a(sub 10). Comparisons between the reliability indices from the static and dynamic methods indicate that the seismic reliability can be significantly underestimated by the static method especially at sites with low seismicity.