NEAR FAULT GROUND MOTION EFFECTS ON SDOF INELASTIC RESPONSE

摘要

Earthquake records from sites at known locations relative to the faults which caused the earthquakes were used to study the near fault effect of ground motions on the inelastic response of single-degree-of-freedom (SDOF) systems. SDOF oscillators with target ductilities of 2, 4, and 6 were analyzed over a period range of T=0.05-3.0s. Severity of inelastic response was defined by the lateral force reduction factor and ductility (R-μ) relationship. It was found that the inelastic response of medium to long period oscillators increased for near-fault sites as the distance along the fault from the epicenter increased while the inelastic response of short period oscillators was relatively unaffected. A design methodology was proposed to predict average inelastic response for structures with periods ranging from 0 to 3s, at various locations relative to the fault.