Abstract
Seven groups of long-period ground motions (LPGMs) and three groups of ordinary ground motions (OGMs) were selected and bidirectionally input into a high-rise structure; the energy distribution and dissipation characteristics of the structure were studied comparatively. The results show that at the same seismic level, the input energy of the structure under LPGMs is significantly greater than that under OGMs. Under OGMs, the structure mainly dissipates energy through damping the energy, while under LPGMs, hysteretic energy becomes the main way of energy dissipation. During an 8-degree frequent earthquake, coupling beams are the main energy dissipation members, the floors below 2/3 of the structural height mainly dissipate hysteresis energy by coupling beams, with the hysteretic energy ratio ranging from 61% to 99.9%, and the floors above 2/3 of the structural height mainly dissipate hysteretic energy by frame beams. During 8-degree design and rare earthquakes, the hysteretic energy ratio of coupling beams significantly decreases, and frame beams are the main energy-dissipating members; the hysteresis energy on the first to second floors is mainly dissipated by shear walls, while on floors above the third floor, the hysteresis energy is mainly borne by frame beams, the hysteretic energy ratio from the fifth to the twelfth accounts for 56% to 89%, and above the twelfth floor accounts for more than 85% to 90% on that floor.