Research of Seismic Reliability Analysis of Structural Systems

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Quantification of seismic reliability or seismic safety of structural systems has become one of the important research subjects in connection with the damageability of structural systems. The objective of this research is modeling of random earthquake excitation with non-stationary spectral characteristics, analyzing seismic reliability of structural systems based on the probabilistic moment response and developing of concrete and effective approach to estimation of seismic structural reliability.The main research items for this objective were1. estimation of probabilistic earthquake response of structural systems with multi-degree-of-freedom having bi-linear or poly-linear hysteretic characteristics,2. calculation of sensitivity of this response to the predominant angular frequency and the shaping factor,3. selection and quantification of effective parameter to seismic safety of structural systems.Following the above research items, studies were carried out and their results were categorized into three parts entitled by (1) estimation of earthquake input characteristics and ground amplification characteristics, (2) analysis of seismic reliability of structural systems and (3) analysis of the optimum active control force of structural systems subjected to earthquake excitation.The results were confined to rather fundamental stage of the research as presented in the report paper.However, continuous efforts are unavoidable for the completion of the objective of this research from the broader sense of an earthquake engineering view point. We have made resolution to take a further step toward this research objective.