USE OF STRENGTH REDUCTION FACTORS TO ACCOUNT FOR LOW CYCLE FATIGUE

摘要

A seismic design procedure that does not take into account the maximum and cumulative plastic deformation demands that a structure will likely undergo during severe ground motion could lead to unreliable performance. In spite of this, current design procedures do no take into account explicitly the effect of low cycle fatigue. This paper outlines a simple procedure to estimate the cumulative plastic demands in a structure as a function of the strength reduction factor used during its seismic design, and discusses how can this estimate be used within a performance-based design methodology that accounts for low cycle fatigue.