Research on Deformation and Energy Dissipation in a Symmetrical High-Rise Structure Under Bidirectional Near-Field Pulse-like Ground Motions

Seven groups of near-field pulse-like ground motions and three groups of ordinary ground motions were bidirectionally inputted into a symmetrical high-rise structure to comparatively study the deformation and energy dissipation characteristics of the structure. The results reveal that compared to ordinary ground motions, under near-field pulse-like ground motions, the inter-story drift angles of the structure significantly exceed the code limit, accompanied by a downward shift of the floors with the maximum drift angles. Moreover, the input energy is substantially higher and the hysteresis energy dissipation supersedes damping energy dissipation as the dominant mode. During an 8-degree frequent earthquake, coupling beams are the main energy-dissipating members, the floors below 2/3 of structural height mainly dissipate hysteresis energy by coupling beams, while the floors above 2/3 of structural height mainly dissipate hysteresis energy by frame beams. During 8-degree design earthquakes and rare earthquakes, frame beams are the main energy-dissipating members, the hysteresis energy ratio of coupling beams is significantly reduced, and the hysteresis energy ratio of shear walls gradually increases. During 8-degree design earthquakes, the 1st floor mainly dissipates hysteresis energy by shear walls, the 2nd to 6th floors mainly dissipate hysteresis energy by coupling beams, and the 7th to 36th floors mainly dissipate hysteresis energy by frame beams. During 8-degree rare earthquakes, the hysteresis energy on the 1st to 2nd floors is mainly dissipated by shear walls, while it is mainly borne by frame beams on other floors.