Correlation between Partial Safety Factor and Return Period of Input Motions for Seismic Reliability Design Method of Steel Rigid Frame Piers

Abstract eng:
The Application of performance-based design is promoted as a global trend that is representative of ISO2394, emphasizes the importance of evaluating structural safety based on the reliability design method. This paper describes correlation between partial safety factors and the return period of input motions for use of the reliability design method for steel rigid-frame piers. The correlation is confirmed by design of a steel pier to withstand local buckling against ground excitation. In addition, effects of medium and small scale earthquakes are examined according to the return period of seismic loading. The seismic reliability of a steel rigid-frame pier was evaluated in this study for earthquake hazards in five cities in Japan. Results of this study were obtained as explained below. For calculation of the optimum partial safety factor of steel rigid-frame pier, several combinations showed increased safety in comparison to primary values of partial safety factors. Results of optimum partial safety factor calculation considering the return period of seismic load generally show that resistance factors of return periods are uniform values, and that load factors are decreasing with return period expansion. However, effects of partial safety factors are not constant. Seismic loads affect the partial safety factors.

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