DISPLACEMENT AMPLIFICATION FACTORS FOR DEGRADING SYSTEMS SUBJECTED TO NEAR-FAULT GROUND MOTIONS

摘要

The displacement demands of single-degree-of-freedom degrading systems subjected to near-fault ground motions are studied. The investigation included models with 5 percent damping, three levels of strength and stiffness decay and five ground motions. The results show that stiffness and strength degradation tend to increase the maximum inelastic displacements above those observed for nondegrading systems. They also show that the additional displacement amplification is more significant for short period systems. Average amplification factors in the order of two were obtained at short periods, though factors as high as four were observed for individual records. At long periods, a small or no additional amplification was observed.