TY - JFULL AU - Y. Araki and M. Kim and S. Okayama and K. Ikago and K. Uetani PY - 2011/12/ TI - Dynamic Instability in High-Rise SMRFs Subjected to Long-Period Ground Motions T2 - International Journal of Civil and Environmental Engineering SP - 618 EP - 626 VL - 5 SN - 1307-6892 UR - https://publications.waset.org/pdf/2554 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 59, 2011 N2 - We study dynamic instability in high-rise steel moment resisting frames (SMRFs) subjected to synthetic long-period ground motions caused by hypothetical huge subduction earthquakes. Since long duration as well as long dominant periods is a characteristic of long-period ground motions, interstory drifts may enter the negative postyield stiffness range many times when high-rise buildings are subjected to long-period ground motions. Through the case studies of 9 high-rise SMRFs designed in accordance with the Japanese design practice in 1980s, we demonstrate that drifting, or accumulation of interstory drifts in one direction, occurs at the lower stories of the SMRFs, if their natural periods are close to the dominant periods of the long-period ground motions. The drifting led to residual interstory drift ratio over 0.01, or to collapse if the design base shear was small. ER -